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                                                                   Exhibit 10.13

                        INDEPENDENT CONTRACTOR AGREEMENT

This Agreement is entered into as of November 1, 2001 ("Effective Date") between
UNIVERSAL ACCESS GLOBAL HOLDINGS INC., whose principal place of business is 233
South Wacker Drive, Suite 600, Chicago, Illinois 60606 ("the Company") and
CAROLYN F. KATZ, an individual whose address is ________________________________
_________________ (hereinafter "Consultant").

1.   SERVICES; TERM

     1.1  SCOPE OF SERVICES. Consultant will perform the services ("Services")
     described in the Task Orders executed by the parties and attached hereto as
     EXHIBIT A.

     1.2  TERM. The term of this Agreement shall begin on the Effective Date and
     end on December 31, 2002.

2.   PAYMENT

     2.1. PAYMENT. Company will pay Consultant in the amounts and in accordance
     with the arrangements specified in each Task Order.

     2.2. INVOICING, LATE PAYMENTS. Except as otherwise set forth in a Task
     Order, Consultant will invoice monthly for the Services. Company will pay
     the amounts invoiced within thirty (30) days of Company's receipt of the
     invoice. Interest will accrue at one (1) percent per month compounded
     monthly on amounts not paid within thirty (30) days of the invoice due
     date.

     2.3. EXPENSES. Company will reimburse Consultant for all reasonable
     expenses incurred by Consultant in connection with the Services, including
     travel and lodging expenses, and as set forth in the Task Order. Travel
     shall be conducted in accordance with Company's travel policies and
     procedures.

     2.4. TAXES. Company will reimburse Consultant for any sales tax, use tax,
     or other taxes incurred by Consultant in connection with the provision of
     the Services (other than income taxes imposed on Consultant).

3.   WARRANTIES

     3.1  Consultant warrants that it will perform the Services hereunder in a
     competent and workmanlike manner utilizing reasonable care and skill.

     3.2  EXCEPT FOR THE EXPRESS WARRANTY SET FORTH IN SECTION 3.1 ABOVE,
     CONSULTANT EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES AND REPRESENTATIONS
     OF ANY KIND OR NATURE WITH RESPECT TO THE SERVICES AND ANY OBLIGATION,
     LIABILITY, PERFORMANCE, NONPERFORMANCE, AND ANY OTHER MATTER IN CONJUNCTION
     WITH THIS AGREEMENT, WHETHER EXPRESSED OR IMPLIED, INCLUDING IMPLIED
     WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY,
     NON-INFRINGEMENT, TITLE OR OTHERWISE. CONSULTANT DOES NOT WARRANT THAT THE
     SERVICES PERFORMED BY

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     ITS PERSONNEL WILL BE ERROR FREE, FREE OF UNINTENDED CONSEQUENCES, OR FULLY
     COMPREHENSIVE.

4.   LIMITATION OF LIABILITY

IN NO EVENT WILL EITHER PARTY BE LIABLE TO THE OTHER FOR CONSEQUENTIAL, SPECIAL,
INDIRECT, INCIDENTAL OR PUNITIVE LOSS, DAMAGE OR EXPENSES (INCLUDING LOST
PROFITS OR SAVINGS) EVEN IF ADVISED OF THEIR POSSIBLE OCCURRENCE. IN NO EVENT
WILL EITHER PARTY'S LIABILITY, IF ANY, UNDER EACH TASK ORDER EXCEED THE AMOUNTS
PAID TO CONSULTANT BY THE COMPANY UNDER SUCH TASK ORDER.

5.   TERMINATION

     5.1. TERMINATION. Either party may at any time and without cause terminate
     this Agreement by giving 30 days written notice of termination. In the
     event of such termination. Company will pay Consultant for all Services
     rendered and reasonable expenses incurred by Consultant prior to the
     expiration of such period.

     5.2. SURVIVAL. The terms of Sections 3 through 8 will survive the
     termination or expiration of this Agreement for any reason.

6.   INDEPENDENT CONTRACTOR RELATIONSHIP

Consultant will undertake the Services as an independent contractor. Consultant
will determine the manner and method of its performance of the Services, and
Company's general right to supervise the Services will not make Consultant, or
its agents or personnel, the agents or employees of Company. The provision of
Services under this Agreement will not result in any partnership, joint venture,
or trust relationship between Consultant and Company. Neither party will have
the authority to make any statements, representations, or commitments of any
kind on behalf of the other party, or to take any action binding upon the other.

7.   INTELLECTUAL PROPERTY; CONFIDENTIALITY

     7.1  The provisions of EXHIBIT B are hereby incorporated herein and made a
     part hereof.

     7.2  The parties have or will execute a confidentiality and non-disclosure
     agreement substantially in the form attached hereto as EXHIBIT C.

8.   GENERAL PROVISIONS

     8.1 NON-SOLICITATION. During the term of this Agreement, and for a period
     of one year thereafter, Consultant will not, directly or indirectly, on
     behalf of itself or as a partner or as an officer, director, employee,
     agent, consultant or shareholder of any other entity or person, or as a
     trustee, fiduciary or other representative of any other person or entity,
     induce, attempt to induce or hire any employee (or any person who was an
     employee during the year preceding the date of any solicitation) of Company
     or its affiliates to leave the employ of Company or its affiliates, or in
     any way interfere with the relationship between any such employee and
     Company or its affiliates.

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     8.2  SEVERABILITY. If any term or provision of this Agreement is be found
     by a court of competent jurisdiction or by an arbitrator to be invalid,
     illegal or otherwise unenforceable, such finding will not affect the other
     terms or provisions of this Agreement or the whole of this Agreement, but
     such term or provision found to be invalid, illegal or otherwise
     unenforceable will be deemed modified or narrowed to the extent necessary
     in the court's or arbitrator's opinion to render such term or provision
     enforceable, and the rights and obligations of the parties will be
     construed and enforced accordingly, preserving to the fullest permissible
     extent the intent and agreements of the parties set forth in this
     Agreement.

     8.3  NOTICES. Any notice or other communication given pursuant to this
     Agreement must be in writing and will be effective when delivered
     personally to the party for whom intended, or when signed for by that
     person (or that person's authorized representative) if delivered by
     messenger or express courier service or by certified or registered United
     States mail, or five (5) days following deposit of the same into the United
     States mail, first class postage prepaid, provided that in each case other
     than personal delivery the notice is addressed and sent to such party at
     the address set forth above.

     8.4  FORCE MAJEURE. Neither party will be liable for any delays or failures
     in performance of any obligations under this Agreement, due to causes
     beyond its reasonable control, including, but not limited to: acts of God,
     fire, explosion, or other similar catastrophes; any law, order, regulation,
     direction, action or request of any government (or body thereof) having
     jurisdiction over either of the parties; national emergencies,
     insurrections, riots, wars or terrorist attacks; or strikes, lock-outs,
     work stoppages or other labor difficulties.

     8.5  COMPLETE AGREEMENT. This Agreement includes Task Orders executed
     hereunder (which are incorporated herein and made a part hereof) and sets
     forth the entire understanding between the parties with respect to the
     performance of the Services and the subject matter of this Agreement, and
     supersedes all prior and contemporaneous agreements, arrangements,
     correspondence, requests for proposals, proposals, and communications,
     whether oral or written, with respect to the performance of the Services or
     the subject matter of this Agreement.

     8.6  GOVERNING LAW. This Agreement will be governed by and construed in
     accordance with the laws of the State of Illinois without giving effect to
     any choice-of-law rules that may otherwise require application of the laws
     of another jurisdiction.

     8.7  LEGAL AND EQUITABLE REMEDIES. The Company shall have the right to
     enforce this Agreement and any of its provisions by injunction, specific
     performance or other equitable relief, without bond and without prejudice
     to any other rights and remedies that the Company may have for a breach of
     this Agreement by Consultant.

     8.8  ASSIGNMENT. Neither this Agreement nor any interest herein nor any
     claim arising under or in connection with or relating to this Agreement may
     be assigned by Consultant without the Company's prior written consent, and
     any attempted assignment without such consent will be void. Company may
     assign this Agreement without the consent of Consultant.

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     8.9  SUCCESSORS. This Agreement will inure to the benefit of and will be
     binding upon the parties, their respective successors and permitted
     assignees and transferees, unless otherwise provided in this Agreement.

     8.10 AMENDMENTS. The terms and conditions of this Agreement may not be
     amended, changed, modified, supplemented or waived without the signature of
     each party. No waiver of any breach, delay or default under this Agreement
     will constitute a waiver of any other or subsequent breach, delay or
     default hereunder, whether or not similar.

AGREED AND ACCEPTED:

UNIVERSAL ACCESS GLOBAL HOLDINGS INC.                 CONSULTANT

--------------------------------------------------------------------------------
Authorized Signature                                  Authorized Signature

                                                      CAROLYN F. KATZ
--------------------------------------------------------------------------------
Printed Name                                          Printed Name

--------------------------------------------------------------------------------
Date                                                  Date

                                                      --------------------------
                                                      Social Security Number

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                                    EXHIBIT A

                                   TASK ORDER

Task Order under Independent Contractor Agreement (the "Agreement") with
Universal Access Global Holdings Inc. dated as of November 1, 2001.

DESCRIPTION OF SERVICES:

Consultant will provide financial and strategic analysis for the Company,
including potential acquisitions, strategic alliances, partnerships, financing
opportunities and other transactions which the Company may consider and will
assist in the preparation of financial models. Consultant will, upon reasonable
notice from Company, make herself available at all reasonable times during
normal business hours for consultation with the officers and directors of
Company with respect to such services, including without limitation the
Company's Chief Financial Officer, Chief Development Officer and Chairman and
Chief Executive Officer.

COMPENSATION:

(a)  $12,000 / MONTH (payable in arrears)

(b)  Company will grant Consultant, subject to approval by its Board of
Directors or appropriate committee thereof, an option to purchase 43,000 shares
of Common Stock of the Company. The per share exercise price for the shares
subject to the option will be the fair market value of a share of Common Stock
as of the date of grant. The option will vest with respect to 1/12 of the shares
subject to the option at the end of each month beginning with January 2002. The
option will be granted under the Universal Access, Inc. 1999 Stock Plan and will
be subject to its provisions and the terms of the Notice of Stock Option Grant
made thereunder. CONSULTANT ACKNOWLEDGES THAT THE VALUE OF SUCH OPTION IS
CONTINGENT UPON THE MARKET FOR THE COMPANY'S COMMON STOCK AND THAT THE EXERCISE
PRICE OF THE OPTION MAY EXCEED THE MARKET VALUE FOR THE COMPANY'S COMMON STOCK
DURING THE TIME IN WHICH THE OPTION IS EXERCISABLE.

AGREED AND ACCEPTED:

UNIVERSAL ACCESS GLOBAL HOLDINGS INC.                      CONSULTANT

-------------------------------------------------------------------------------
Authorized Signature                                       Authorized Signature

                                                           Carolyn F. Katz
-------------------------------------------------------------------------------
Printed Name                                               Printed Name

November 1, 2001                                           November 1, 2001
-------------------------------------------------------------------------------
Date                                                       Date

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                                    EXHIBIT B

                              INTELLECTUAL PROPERTY

A.   NO USE OF NAME OR TRADEMARKS. Neither party will utilize the names or
trademarks of the other in connection with any advertising, marketing or
promotion of any kind without obtaining the other party's prior written consent.
Without limiting the foregoing, neither party will publicize, promote or
disclose that Consultant is providing Services to Company pursuant to this
Agreement without obtaining the other party's prior written consent.

B.   WORK PRODUCT. Company retains all rights, title and interest in and to all
software, programming documentation, technical ideas, concepts, know-how,
inventions, discoveries, improvements, techniques and all related intellectual
property rights, created, conceived and developed by Company prior to the
commencement of this Agreement (the "Company Prior Technology"). All right,
title, and interest in and to all derivative works, enhancements, extensions and
modifications of or related to the Company Prior Technology or other products
developed in whole or in part by Company, including without limitation all
intellectual property rights therein (the "Developed Technology") shall be the
sole property of Company whether developed by Company or any other party in
performing the Services or otherwise. All ideas, know-how, techniques or other
intellectual property rights originated, developed or owned by the Consultant
prior to the commencement of this Agreement and ideas, know-how, techniques or
other intellectual property, excluding the Developed Technology developed solely
by Consultant during the term of the Agreement or services not specified within
a Task Order, shall be the sole property of Consultant.

C.   INVENTIONS AND DATA RIGHTS

     C.1 Consultant agrees that all notes, models, writings, reports, formulas,
     specifications, memoranda, computer source code and documentation and other
     data prepared and/or produced by Consultant in the performance of this
     Agreement and all derivative works thereof are works made for hire and are
     assigned to and shall become the sole property of Company, including all
     rights therein of whatever kind or nature, and Consultant agrees not to
     disclose same to any other person, firm or corporation. Upon termination of
     its work on the project, or upon the termination or expiration of this
     Agreement, Consultant agrees to promptly deliver to Company all documents
     and other records that relate to the business activities of Company, and
     all other materials which belong to Company.

     C.2 Consultant agrees and does hereby assign to Company as its exclusive
     property, its entire right, title and interest in those inventions,
     innovations or ideas developed or conceived by it solely or jointly with
     others, during the term of Consultant's work for or at Company, which
     inventions, innovations or ideas relate to the products, processes,
     developments, research activities, or other business activities of Company,
     or result from work which Consultant performed at or for Company. All
     rights, title and interest in such inventions shall be vested in Company
     immediately upon such development or conception. Consultant further agrees
     that, when requested, Consultant will without charge to Company, but at
     Company's expense, sign all papers, take all rightful oaths, and do all
     acts which may be necessary, desirable or convenient for securing and
     maintaining the patents, copyrights and legal protection for inventions or
     innovations in any and all countries and for vesting title in Company, its
     successors, assigns, and legal representatives or nominees.

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     C.3 If Consultant, during the course of performing the Services for the
     Company, discovers, invents, or produces, without limitation, any
     information, computer programs, software or other associated intangible
     property, network configuration, formulae, product, device, system,
     technique, drawing, program or process which is a "trade secret" within the
     meaning of the Illinois Trade Secret Act (irrespective of where Consultant
     performs the Services), such information, formulae, product, device,
     system, technique, drawing, program or process shall be assigned to the
     Company. Consultant agrees to fully cooperate with the Company in
     protecting the value and secrecy of any such trade secret, and further
     agrees to execute any and all documents the Company deems necessary to
     document any such assignment to the Company. Consultant appoints the
     Company as Consultant's attorney-in-fact to execute any documents the
     Company may deem necessary that relates to any such trade secret or
     assignment thereof to the Company.

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                                    EXHIBIT C

                  CONFIDENTIALITY AND NON-DISCLOSURE AGREEMENT

This Confidentiality and Non-Disclosure Agreement (this "Agreement") is
effective as of November 1, 2001 between Carolyn F. Katz, an individual, with an
address at _______________ and Universal Access Global Holdings Inc., a Delaware
corporation, with an office at 233 S. Wacker, Suite 600, Chicago, Illinois 60606
(collectively, the "Parties").

                                   BACKGROUND

THE PARTIES HAVE AGREED TO EXPLORE A POSSIBLE TRANSACTION AND/OR RELATIONSHIP
(THE "TRANSACTION"). IN CONNECTION WITH THE TRANSACTION, THE PARTIES HAVE AGREED
TO EXCHANGE CONFIDENTIAL INFORMATION (DEFINED BELOW), SUBJECT TO THE FOLLOWING
TERMS AND CONDITIONS. A PARTY, INCLUDING ITS AFFILIATES (DEFINED BELOW),
PROVIDING ANY CONFIDENTIAL INFORMATION TO THE OTHER PARTY IS REFERRED TO HEREIN
AS THE "OWNER," AND THE PARTY RECEIVING ANY CONFIDENTIAL INFORMATION FROM THE
OTHER PARTY IS REFERRED TO HEREIN AS THE "RECIPIENT." A PARTY CAN BE BOTH AN
OWNER AND A RECIPIENT HEREUNDER.

                              TERMS AND CONDITIONS

                NOW THEREFORE, in consideration of the foregoing and the
                mutual promises contained in this Agreement, the Parties,
                intending to be legally bound, hereby agree as follows:

1.   As used herein, "Confidential Information" means any and all information,
     whether furnished orally, in writing or in any tangible or intangible form
     or medium, that is confidential or proprietary to Owner, any
     Representatives (defined below) of Owner, or any third party, that Owner
     may disclose to Recipient in connection with the Transaction, or which,
     although not related to the Transaction, is nevertheless disclosed as a
     result of discussions and/or dealings between the Parties or their
     Affiliates or Representative's and which should reasonably have been
     understood by the Recipient to be proprietary and confidential to the
     Owner, because of legends or other markings, the circumstances of the
     disclosure or the nature of the information itself. For purposes of this
     Agreement, (a) "Affiliates" means any person or entity controlling,
     controlled by, or under common control with the applicable party, and (b)
     "Representatives" means a respective party's directors, officers,
     employees, consultants, and advisors.

2.   The term "Confidential Information" does not include any information that
     (a) at the time of disclosure or thereafter is generally available to the
     public (other than as a result of a wrongful disclosure directly or
     indirectly by the Recipient or its Representatives), (b) was or becomes
     available to the Recipient from a source other than the Owner or its
     Representatives, provided that the Recipient has no

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     reasonable basis for concluding that such information was made available in
     violation of a confidentiality agreement with the Owner, (c) is
     independently developed by the Recipient without violating any of its
     obligations under this Agreement and demonstrated by Recipient's
     contemporaneous business records, (d) is generally made available to third
     parties by the Owner without restriction on disclosure, or (e) is disclosed
     with the prior written consent of the Owner.

3.   Recipient will hold the Confidential Information in confidence and protect
     it in accordance with the security measures by which it protects its own
     proprietary and/or Confidential Information that it does not wish to
     disclose, except that Recipient will use at least a reasonable degree of
     care. Recipient will use the Confidential Information received from Owner
     solely for the purpose of the Transaction and such information will be kept
     confidential by Recipient, except that Recipient may disclose Owner's
     Confidential Information, or portions thereof, to its Affiliates or
     Representatives, or to the Representatives of its Affiliates, who need to
     know such information for the purpose of the Transaction and who are bound
     by obligations of non-disclosure at least as restrictive as those imposed
     by this Agreement. Prior to disclosing the Confidential Information or any
     portion thereof to such parties, Recipient will inform those parties of the
     confidential nature of the Confidential Information and their duty to treat
     such Confidential Information in accordance with the applicable
     non-disclosure agreement. Each party will be responsible for the breach of
     this Agreement by any person to whom it has delivered Confidential
     Information.

4.   If Recipient or any of its Affiliates or Representatives become legally
     compelled by law, regulation, rule, or by deposition, interrogatory,
     request for documents, subpoena, civil investigative demand or similar
     process, or is advised by legal counsel to disclose any of the Confidential
     Information, Recipient will use reasonable efforts to provide Owner with
     prompt notice of such requirement or advice prior to disclosure so that
     Owner may seek a protective order or other appropriate remedy and/or waive
     compliance with the terms of this Agreement. If such protective order or
     other remedy is not obtained, or Owner waives compliance with the
     provisions hereof, the party compelled to make disclosure will furnish only
     that portion of the Confidential Information which it is legally required
     to so furnish and use reasonable efforts to obtain assurance that
     confidential treatment will be accorded such Confidential Information.

5.   Upon written request by Owner, Recipient will return to Owner promptly all
     Confidential Information received from Owner in Recipient's or its
     Affiliates' or Representatives' possession or certify within such period
     that it and its Affiliates and Representatives have destroyed such
     information.

6.   Neither this Agreement nor the disclosure by Owner of the Confidential
     Information or other information to Recipient will result in any obligation
     on the part of either party to enter into any further agreement with the
     other with respect to the subject matter hereof or otherwise, to purchase
     any products or services

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     from the other or to require either party to disclose any particular
     information to the other. Nothing in this Agreement will imply any
     partnership or joint Transaction between the Parties or be construed as
     making either party the agent of the other.

7.   THE PARTIES ACKNOWLEDGE AND AGREE THAT A BREACH OF ANY OF THE PROVISIONS OF
     THIS AGREEMENT WILL RESULT IN IMMEDIATE AND IRREPARABLE HARM FOR WHICH
     MONEY DAMAGES WOULD NOT BE AN ADEQUATE REMEDY. IN THE EVENT OF ANY BREACH
     OR THREATENED BREACH OF THE PROVISIONS OF THIS AGREEMENT, THE NON-BREACHING
     PARTY MAY OBTAIN EQUITABLE RELIEF WITHOUT THE NECESSITY OF POSTING A BOND,
     INCLUDING INJUNCTIONS AND ORDERS FOR SPECIFIC PERFORMANCE, IN ADDITION TO
     ALL OTHER REMEDIES AVAILABLE AT LAW OR IN EQUITY.

8.   Upon ten (10) business days written notice, either party may notify the
     other that it no longer wishes to receive or provide Confidential
     Information. Any information received or provided by either party
     thereafter will not be subject to the protection of this Agreement.

9.   This Agreement will expire two (2) years from the date hereof.
     Notwithstanding anything herein to the contrary, the non-disclosure
     obligations of the Parties set forth in this Agreement will survive the
     expiration or termination of this Agreement.

10.  Neither this Agreement nor any rights hereunder in whole or in part are
     assignable or otherwise transferable by either party without the prior
     written consent of the other party.

11.  The laws of the State of Illinois will govern this Agreement. Any dispute
     arising under the terms hereof will be heard only before courts of
     competent jurisdiction in Chicago, Illinois.

12.  This Agreement constitutes the entire understanding between Recipient and
     Owner as to the Confidential Information provided in connection with the
     Transaction and merges all prior and contemporaneous discussions and
     agreements between them relating thereto.

13.  This Agreement may be executed in one or more counterparts, each of which
     will be deemed an original, and all of which when taken together will
     constitute one and the same instrument.

14.  This Agreement will be binding upon each party and its successors and
     assigns, and will inure to the benefit of, and be enforceable by, each
     party and its successors and assigns.

15.  The provisions of this Agreement will be severable in the event that any of
     the provisions hereof are held by a court of competent jurisdiction to be
     invalid, void

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     or otherwise unenforceable, and the remaining provisions will remain
     enforceable to the fullest extent permitted by law.

                                   SIGNATURES

Each party has caused this Agreement to be executed on its behalf by an
authorized individual as of the date set forth above.

Carolyn F. Katz                          Universal Access Global Holdings Inc.

Signature:                               Signature:
          ----------------------                   -----------------------------

Name:                                    Name:
     ---------------------------              ----------------------------------

Title:                                   Title:
      --------------------------               ---------------------------------

                                                                              12<Page>

                                                                   Exhibit 10.17
                                                          Agreement No._________

                            MASTER SERVICES AGREEMENT

         THIS MASTER SERVICES AGREEMENT ("Agreement") is made this 1st day of
October, 2001, by and between Williams Communications, LLC, a Delaware limited
liability company ("Williams"), with its principal place of business at One
Technology Center, 100 South Cincinnati 6th Floor, Tulsa, Oklahoma 74103, and
Universal Access, Inc., a Delaware corporation ("Customer"), with its principal
place of business at Sears Tower, 223 S. Wacker, Suite 600, Chicago, Illinois
60606, for the provision of telecommunications services, subject to this
Agreement and as set forth in this Agreement.

                                    RECITALS

WHEREAS, the parties entered into a Carrier Services Agreement 98R0613.00
("CSA") as of June 29, 1998, which contained a revenue commitment.

WHEREAS, the parties desire to resolve all issues relating to commitment
shortfalls and early termination liability under the CSA.

WHEREAS, Williams and Customer are parties to that certain Universal Transport
Exchange License Agreement entered into contemporaneously herewith (the
"Collocation Agreement").

                       ARTICLE 1. AGREEMENT OF THE PARTIES

1.1  SERVICES. Customer may order from Williams telecommunications services
     which may consist of either or both Williams' Services or Third Party
     Services, (sometimes referred to herein collectively or individually, as
     the "Service(s)"). "Williams' Services" shall consist of those Services
     described in the attached service schedule(s) ("Service Schedule(s)"), as
     indicated in Table A (check as applicable), but does not include any
     Services which constitute Third Party Services as defined below in Section
     1.2. All Services shall be provided upon the terms and conditions that are
     set forth in this Agreement, including any applicable Service Schedule and
     process and procedure as set forth in Exhibit B. This Agreement will
     supercede the CSA and all Services provided pursuant to the CSA will now be
     provided under this Agreement. The circuits provided under the CSA which
     will now be provided pursuant to this Agreement (the "Existing Circuits")
     are listed in Exhibit A. The Existing Circuits will continue to be provided
     at the price and term as set forth in the original Service Order placed
     under the CSA. The circuits, which have been ordered under the CSA but are
     not in service (the "Pending Circuits") will be priced under the Agreement.
     All Services are subject to availability and approval of Customer's credit
     by Williams.

<Table>
       TABLE A
       <S>                                           <C>
       Schedule 1  /X/ Private Line Service          Schedule 8  / / Carrier Voice Services
       Schedule 2  /X/ Optical Wave Service          Schedule 9  /X/ International Backhaul Services
       Schedule 3  /X/ ATM Service                   Schedule 10 /X/ International Private Line Service
       Schedule 4  / / Dedicated Internet Service    Schedule 11 / / Collocation Service
       Schedule 5  / / Frame Relay Service           Schedule 12 / / CNMS Service
       Schedule 6  / / Network Timing Services       Schedule 13 /X/ Metro Access Service
       Schedule 7  / / Switched Voice Service

</Table>

1.2  THIRD PARTY SERVICES. Williams may arrange on behalf of Customer for
     services to be provided by a third party ("Third Party Services"). For
     instance, Third Party Services may include Third Party Local Access
     Services, third party provided interexchange services, and third party
     provided international service. Third Party Local Access Services shall be
     arranged pursuant to Article 4 of this Agreement. When Customer requests
     international service, Williams may arrange for the foreign end of the
     Service or for a portion of the foreign end of the Service to be provided
     by a third party carrier licensed in the relevant foreign point. In some
     cases, Williams may be unable to, and Customer may be required to, arrange
     the foreign end of such Service with a foreign carrier. Although this
     Agreement governs the terms of Williams' arrangement of Third Party
     Service, the service level parameters and related warranties (if any),
     pricing, surcharges, outage credits, required commitments, termination
     liability, and other service specific terms of the Third Party Service
     shall be those of the provider of the Third Party Services ("Third Party
     Provider").

             ARTICLE 2. EFFECTIVE DATE, TERM AND REVENUE COMMITMENT

2.1  TERM OF AGREEMENT. This Agreement shall become effective on the date first
     written above ("Effective Date") and shall continue through the tenth
     anniversary of such Effective Date ("Term"). This Agreement shall
     automatically renew for month

                        Williams Communications                     Page 1 of 15
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

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                            MASTER SERVICES AGREEMENT

     to month periods ("Renewal Terms") unless either party gives written notice
     to the other party that the Agreement will not be renewed, such notice to
     be delivered at least thirty (30) days before the end of the Term or the
     then current Renewal Term.

2.2  SERVICE ORDER TERM. Each Service Order placed under this Agreement shall
     have its own term, as indicated on such Service Order ("Service Term"). At
     the end of the Service Term for any Service Order (as defined in Section
     3.1(a)), such Service Order shall continue on a month-to-month basis
     ("Extension Period") unless either party gives written notice to the other
     that the Service described in such Service Order shall be disconnected,
     such notice to be delivered at least thirty (30) calendar days before the
     end of the Service Term, or if during the Extension Period, then upon at
     least thirty (30) calendar days' written notice. Customer's charges, as set
     forth in this Agreement, for Services provided by Williams at the
     expiration of the Service Term shall continue to apply to Customer's
     Service throughout any Extension Period, unless modified pursuant to the
     terms of this Agreement. Unless Customer is in default, any Service being
     provided at the time of termination of this Agreement shall continue upon
     the terms and conditions of this Agreement until end of the Service Term or
     any applicable Extension Period Service as specified in the applicable
     Service Order or until such Service Order is terminated pursuant to the
     second sentence of this Section 2.2; provided, however, that Customer may
     not order any new Service until Customer and Williams have entered into a
     new agreement or mutually agreed in writing to extend this Agreement.

2.3   Revenue Commitment.

     a.  In consideration of the pricing and discounts and other terms and
         conditions offered to Customer, Customer agrees to purchase Applicable
         Services (as defined below) under this Agreement in the amount of
         Fifty-seven Million, Six Hundred Thousand dollars ($57,600,000)
         aggregate ("Term Commitment") throughout the Term of this Agreement, as
         set forth in Section 2.3(c) below.

     b.  In addition, commencing on the Effective Date, Customer agrees to
         purchase each year Applicable Services under this Agreement in the
         amount set forth below for the relevant year (each, an "Annual
         Minimum"):

<Table>

            <S>       <C>
            Year 1    = $2,820,000 (per year)
            Year 2-5  = $4,200,000 (per year)
            Year 6-7  = $6,276,000 (per year)
            Year 8-10 = $8,476,000 (per year)
</Table>

         In the event that Customer is in Default of Section 15.1 of the
         Collocation Agreement, then Customer's Annual Minimum shall be
         increased by the amount set forth in Section 15.1 of the Collocation
         Agreement. The Term Commitment and the Annual Minimum will be
         collectively referred to as the "Revenue Commitment".

     c.  In determining whether the annual charges are of a sufficient dollar
         amount to meet Customer's Revenue Commitment, Williams will include the
         monthly recurring charges for Williams' Services. In addition to
         Williams Service(s), any circuit or bandwidth ordered by Customer from
         Williams pursuant to any circuit or bandwidth trade, whether directly
         between the parties or through a broker, and whether any such trade is
         governed by a separate agreement between the parties, shall be
         considered an ("Applicable Service"). Applicable Services shall also
         include all charges and fees associated with any such circuit or
         bandwidth and any paid Deficiency Amounts, (as discounted, if
         applicable) and any credits to which Customer may be entitled pursuant
         to this Agreement. The Applicable Services will not include late
         charges, non-recurring charges, and ancillary charges payment
         penalties, taxes and other government imposed surcharges, or payments
         made by Customer for Third Party Services (including but not limited to
         Third Party Local Access Service) or to reimburse Williams for costs
         paid by Williams to any Third Party Provider.

         To the extent that, in any year during the Term of this Agreement,
         Customer fails to have a total aggregate billing of Applicable Services
         from Williams greater than or equal to the Annual Minimum amount
         applicable to a year, Williams shall invoice Customer, on Customer's
         current or next invoice, and Customer hereby agrees to pay, an amount
         equal of the difference between the Annual Minimum amount and the
         amount of Applicable Services actually purchased by Customer (the
         "Deficiency Amount") for such year. The parties agree that the
         Deficiency Amount represents liquidated damages, and is based on
         Customer's commitment to meet the Annual Minimum amount during each
         year of the Term of this Agreement and Williams' agreement to the
         discounted prices set forth in the Service Schedules attached hereto,
         which are based upon such commitment. Not withstanding the foregoing,
         in the event that Customer has not taken delivery of an Applicable
         Service within forty-five (45) days of the end of the then current term
         then Williams shall not count the monthly recurring charges for
         Williams Services as set forth in such Service Orders towards
         Customer's Annual Minimum.

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     d.  Amounts purchased in any year in excess of the applicable Annual
         Minimum, shall be carried over into the next year, or beyond if
         applicable. Once the total Revenue Commitment of $57,600,000 has been
         satisfied, no further Revenue Commitment will apply under this
         Agreement. If Customer is purchasing both voice and data Services, any
         Deficiency Amount shall be set forth on the Customer's invoice for
         voice Services. If Customer is only purchasing data Services, any
         Deficiency Amount shall be set forth on the Customer's invoice for data
         Services.

     e.  FORECAST AND REMEDY FOR CAPACITY NOT AVAILABLE. Before issuing its
         first Service Order and on a quarterly basis throughout the Term of the
         Agreement, Customer shall provide Williams with a detailed, non-binding
         rolling one (1) year forecast. If, in any consecutive three (3) month
         period, Williams responds to greater than [***] percent ([***]%) of the
         requested Willliam's Private Line Service quotes with "capacity not
         available", and if after reaching this threshold, Williams responds to
         additional request for service with "capacity not available" and
         Customer places an order for and takes delivery of the requested
         service elsewhere, Williams will treat the request for quotation as if
         it were a Service Order placed with Williams for the purposes of
         applying it to the applicable Annual Minimum. If no circuit term was
         specified in the request for quotation, the adjustment to the
         applicable Annual Minimum will apply during the first twelve (12)
         months of the circuit term only.

     f.  COMPETITIVE PRICING.

         PRIVATE LINE. Williams may provide on-net, private line pricing for
         substantially similar services within [***]% of the lowest quote
         provided to Williams by Customer, using [***] as the control group (the
         "Carrier Control Group"). The parties agree to review the Carrier
         Control Group on an as needed basis. The Carrier Control Group may be
         altered if mutually agreed to by the parties. If the lowest quote for
         substantially similar services that Customer receives from the Carrier
         Control Group is more than [***] percent ([***]%) lower than applicable
         Williams's rates, the Customer will give Williams the opportunity to
         submit a revised price. If Williams is unwilling to offer a rate within
         [***]% of such lowest quote, the applicable Annual Minimum will be
         adjusted as if Customer placed such order with Williams provided that
         (i) Customer places an order with and takes delivery from the carrier
         offering a lower quote for substantially similar services and
         (ii) Customer provides to Williams a certificate from either its Vice
         President of Network Engineering or its Vice President of Carrier
         Relations, stating that such lowest quote was a bona fide quote for
         substantially similar services and (iii) that the relevant circuit or
         service was purchased from a member of the Carrier Control Group and
         (iv) that such purchase was made with the same pricing as contained in
         such Carrier Control Group's quote. For purposes of determining whether
         a private line service is substantially similar, the parties will
         consider: (1) type of service, (2) city pair, (3) diversity,
         (4) protected or unprotected, and (5) term. For the purpose of this
         Agreement [***] percent ([***]%) of the lowest price shall mean, the
         monthly recurring charges based on the Voice Grade Equivalent/VH miles.

         METRO SERVICES. Williams may provide on-net, metro pricing for
         substantially similar services within [***]% of the lowest to Williams
         by Customer, using [***] as the control group ("the Metro Control
         Group"). The parties agree to review the Metro Control Group on an as
         needed basis. The Metro Control Group may be altered if mutually agreed
         to by the parties. If the lowest quote for substantially similar
         services that Customer receives from the Metro Control Group is more
         than [***] percent ([***]%) lower than applicable Williams's rates, the
         Customer will give Williams the opportunity to submit a revised price.
         If Williams is unwilling to offer a rate within [***]% of such lowest
         quote, the applicable Annual Minimum will be adjusted based on the
         Monthly Recurring Charge as if Customer placed such order with Williams
         provided that (i) Customer places an order with and takes delivery from
         the carrier offering a lower quote for substantially similar services
         and (ii) Customer provides to Williams a certificate from either its
         Vice President of Network Engineering or its Vice President of Carrier
         Relations, stating that such lowest quote was a bona fide quote for
         substantially similar services and (iii) that the relevant circuit or
         service was purchased from the member of the Metro Control Group and
         (iv) that such purchase was made with the same pricing as contained in
         such Metro Control Group's quote. For purposes of determining whether a
         local or metro service is substantially similar, the parties will
         consider: (1) type of service, (2) metro access point, (3) diversity,
         (4) protected or unprotected, and (5) term.

                 ARTICLE 3. ORDERING AND PROVISIONING OF SERVICE

3.1  SERVICE ORDERS.

     a.  All Services shall be requested on Williams' Service Order forms in
         effect from time to time or on Customer's forms which have been
         previously accepted in writing by Williams ("Service Order(s)").
         Service Orders shall be transmitted and processed in accordance with
         the terms and conditions of this Agreement as well as any procedures
         set out in the

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         applicable Service Schedule for a specific Service. Williams shall
         accept any Service Order under this Agreement that complies with the
         terms and conditions set forth herein, subject to availability and
         credit approval at the time Customer places such Service Order.

     b.  A Service Order is deemed accepted (subject to availability) by
         Williams when Williams' Service Delivery department transmits an
         electronic Order Confirmation Document ("OCD") to Customer indicating
         that Williams is processing Customer's order.

     c.  When a Service Order is placed, Customer will designate: (i) a
         requested start date ("Requested Start Date") for the Service; (ii) the
         desired term of the Service; (iii) the specific city pairs, if
         applicable; (iv) the bandwidth, if applicable; and (v) any other
         information necessary to enable Williams to provide the Service.
         Williams will make reasonable efforts to meet Customer's Requested
         Start Date. In the event that Williams is unable to meet Customer's
         Requested Start Date, Williams will notify Customer of the date when
         Williams believes the Service will be available and Customer's
         Requested Start Date will be changed to reflect the number of days of
         delay or advance, as appropriate. Failure of Williams to deliver by
         Customer's Requested Start Date shall not constitute a default under
         this Agreement and Williams shall not be liable to pay to Customer any
         penalties or damages for Williams' failure to meet Customer's Requested
         Start Date, except for the delay credits set forth in Section 3.4.

     d.  Any terms or conditions contained in Customer's acknowledgement or
         Service Order or elsewhere which conflict with, are different from, or
         are in addition to, the terms and conditions in this Agreement are
         hereby objected to by Williams and shall not constitute part of this
         Agreement. No action by Williams (including, without limitation,
         provision of Services to Customer pursuant to such Service Order) shall
         be construed as binding or estopping Williams with respect to such term
         or condition.

3.2  TURN UP ACKNOWLEDGEMENT. Williams will issue to Customer an electronic
     notice that Service is available ("Turn Up Acknowledgement" or "TUA"). The
     TUA will indicate that the relevant Service ordered through Williams has
     been tested by Williams and that the Williams' Service meets or exceeds the
     Technical Specifications set forth in the relevant Service Schedule. The
     TUA will also set forth the date Customer's Service was available for use
     by Customer and upon which Williams shall commence charging for the
     Service, provided that absent Customer's written acknowledgement, in no
     event will Williams begin to invoice for the Services prior to the
     Customer's Requested Start Date ("Circuit Effective Billing Date").

3.3  SERVICE ACCEPTANCE. Customer shall be deemed to have accepted Service and
     Williams shall begin billing for the Service as of the Circuit Effective
     Billing Date, provided that, if Customer notifies Williams' Service
     Delivery Department in writing within three (3) business days of the
     Circuit Effective Billing Date that Williams' Service is in material
     non-compliance with the applicable Technical Specifications and if, upon
     investigation, such material non-compliance is not due to Customer fault,
     then Williams shall correct the non-compliance and make the appropriate
     adjustment to Customer's billings under this Agreement. The occurrence of
     any such non-compliance shall not constitute a default under this Agreement
     and Williams shall not be liable to pay to Customer any penalties or
     damages resulting from any such non-compliance except for delay credits as
     set forth in Section 3.4, if applicable. Charges for Service begin accruing
     upon Circuit Effective Billing Date, regardless of whether Customer is
     actually using the Services, or is ready to test and accept the Services.

3.4  IMPLEMENTATION INTERVALS REMEDIES.

     a.  It is Williams's goal to provision Williams Services within it standard
         service implementation intervals as set forth in the Schedule
         applicable to each type of Service. Williams's standard service
         implementation intervals apply only to Williams Private Line, Optical
         Wave and Metro Access Services and not Third Party Services.

     b.  In the event Williams fails to make Services available within its
         standard service implementation interval as stated in the applicable
         Schedule, Customer shall receive a pro-rata credit of the monthly
         recurring charge for such Service based on the number of days Service
         is delayed, such credit not to exceed [***] portions. month's monthly
         recurring charge. Customer shall not receive such credit and Williams
         shall not be liable for any delay, if delay is due to the Customer,
         Third Party Local Access provider or as a result of a Force Majeure
         event as defined in Section 8.5 hereof. Notwithstanding anything to the
         contrary in this Agreement, in no event shall Williams' failure to
         deliver William's Service within the periods set forth in the attached
         Schedules constitute a default under this Agreement.

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     c.  In the event Williams fails to make Services available within its
         standard Service implementation interval as stated in the applicable
         Schedule Customer may cancel the Service Order for late delivery.
         Customer shall not have the right to cancel and Williams shall not be
         liable for any delay, if delay is due to the Customer, Third Party
         Local Access provider or as a result of a Force Majeure event as
         defined in Section 8.5 hereof. Notwithstanding anything to the contrary
         in this Agreement, in no event shall William's failure to deliver
         William's Service within the periods set forth in the attached
         Schedules constitute a default under this Agreement.

     d.  Customer may either exercise its right to a delay credit pursuant to
         subsection (b) above or exercise it right to cancel the delayed Service
         pursuant to subsection (c) above but may not exercise both remedies.
         Customer agrees that the delay credit or the right to termination as
         set forth above is Customer's sole remedy and Williams' sole liability
         in the event of any delay in providing such Service. In the event
         Customer cancels a Service Order in accordance with this Section
         3.4(c), such Service Order will be applied to reduce Customer's
         applicable Annual Minimum as if it had not been cancelled.

     e.  ANNUAL IMPLEMENTATION INTERVAL REVIEW. Williams agrees that it will,
         upon the request of Customer and no more often than annually, review
         the actual implementation intervals set forth in the attached Service
         Schedules, and may adjust installation intervals in accordance with:
           i)     prevailing market implementation intervals at the time of the
                  review; and
           ii)    implementation intervals as published by other suppliers,
                  delivering comparable telecommunication services that are
                  substantially similar to the range of service offered by
                  Williams under this Agreement.
         If the parties agree to any such adjustment, such adjustment shall be
         effective upon written amendment and shall not apply to orders, which
         have already been submitted by Customer and accepted by Williams.

3.5  CHANGE OF SERVICE ORDER DATE. Customer may request a delay in the Start
     Date of an order, when Williams receives the delay request a minimum of
     five (5) days prior to the due date and the requested delay does not exceed
     sixty (60) cumulative calendar days from the Service Orders initial Start
     Date. When Customer has delayed a Service Order for the maximum sixty (60)
     cumulative calendar days, the order may not be delayed again by Customer.
     Once the maximum sixty (60) day delay has been achieved, Customer has the
     option to (a) accept the billing for the Service Order, or (b) cancel the
     Service Order and pay the applicable cancellation charges for the
     facilities ordered. The billing or cancellation is effective on the
     sixtieth (60th) cumulative calendar day of the delay. If Customer elects to
     accept billing the installation will be completed as soon as reasonably
     practical after Customer advises Williams that the installation can be
     completed.

                  ARTICLE 4. THIRD PARTY LOCAL ACCESS SERVICES

4.1  THIRD PARTY LOCAL ACCESS SERVICES. Williams may obtain "Third Party Local
     Access Service" on behalf of Customer, which is defined as the
     telecommunications facilities or services connecting a Customer-designated
     termination point to a point of presence ("POP") designated by Williams.
     The term Third Party Local Access Service, as used throughout this
     Agreement, may include both domestic U.S. and foreign Third Party Local
     Access Service. Customer shall execute a Letter of Agency, in a form
     provided by Williams and agreed to by Customer authorizing Williams to
     interact directly with the Third Party Local Access Service provider(s) to
     obtain the Third Party Local Access Service. Customer shall pay all charges
     including, without limitation, monthly charges, usage charges, installation
     charges, non-recurring charges, or applicable termination/cancellation
     charges, of the Third Party Local Access Service provider(s).

4.2  WILLIAMS' PROVISIONING, TESTING, AND CHARGING FOR THIRD PARTY LOCAL ACCESS
     SERVICES. For Third Party Local Access Services ordered by Williams,
     Williams shall provision and conduct the initial testing of an
     interconnection between the Williams' Service set forth in the Service
     Order and the Third Party Local Access Service. Williams shall coordinate
     the installation of the Third Party Local Access Service with the Williams'
     Service. Third Party Local Access Service charges shall accrue at the
     then-current tariff rate (or the standard published rate, if there is no
     tariff rate) of the Third Party Local Access Service provider. If the
     applicable rate for Third Party Local Access Service is changed by the
     Third Party Local Access Service provider, such changes will be passed
     through to, and be borne by, Customer. In the event Williams' Services are
     not ready at the same time as the Williams' ordered Third Party Local
     Access Service, Williams will not begin billing Customer for such Third
     Party Local Access Services until the related Williams' Services are turned
     up.

4.3  CUSTOMER ORDERED THIRD PARTY LOCAL ACCESS SERVICE. Customer may, in
     conformance with Williams' policies on third parties providing connectivity
     into a Williams' POP, order its own Third Party Local Access Services from
     a vendor who has established entrance facilities in Williams' POP
     ("Approved Vendor"). In the event Customer desires to order Third Party
     Local Access Services from someone other than an Approved Vendor, Customer
     must get Williams' prior written permission, which permission shall not be
     unreasonably withheld, conditioned or delayed. In such event, the Third
     Party Local Access Service provider shall directly bill Customer for such
     Services. Williams may charge Customer for any associated entrance

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     facility or mileage charges if it provides Carrier Facility Assignment
     ("CFA") to Customer. Customer shall ensure that the Customer-ordered Third
     Party Local Access Services are turned up at the same time as the Williams'
     Services. If the Customer-ordered Third Party Local Access Services are not
     ready as of the Circuit Effective Billing Date, Customer shall nonetheless
     be obligated to pay for Williams' Services as of the Circuit Effective
     Billing Date.

                      ARTICLE 5. PAYMENT TERMS AND CHARGES

5.1  MONTHLY BILLING. Williams provides and charges for Service on a monthly
     basis in U.S. dollars. Usage sensitive charges are billed in arrears and
     fixed monthly recurring charges, if any, are billed one (1) month in
     advance. Unless Williams requires payment in advance, charges for
     installation charges and other non-recurring charges shall be billed in
     Williams' next invoice cycle and are due and payable in accordance with
     section 5.2 below.

5.2  DUE DATE AND INVOICE. All amounts stated on each monthly invoice are due
     and payable in U.S. dollars within thirty (30) calendar days of the date of
     the receipt of the invoice ("Due Date"). Customer agrees to accept delivery
     of such invoice electronically via e-mail and Customer agrees to remit
     payment to Williams Communications, LLC, 21864 Network Place, Chicago, IL
     60673-1218, or such address as Williams may in writing direct Customer to
     remit payment pursuant to the notice provisions of this Agreement. In the
     event Customer fails to make full payment of undisputed amounts by the Due
     Date, Customer shall also pay a late fee in the amount of the lesser of
     (i) one and one-half percent (1 1/2 %) per month or (ii) the maximum lawful
     monthly rate under applicable state law, of the unpaid balance which amount
     shall accrue from the date of the invoice. Customer acknowledges and
     understands that all charges are computed exclusive of any Additional
     Charges (as defined in Section 5.8(a)). Such Additional Charges shall be
     paid by Customer in addition to all other charges provided for herein

5.3  ADJUSTMENTS. Williams may make billing adjustments for Williams Services
     for one-hundred-eighty (180) calendar days after the Due Date or after the
     date Service is rendered, whichever is later. Williams may make billing
     adjustments for Third Party Services for a period of two (2) years.

5.4  RETURN CHECK CHARGE. When applicable, a return check charge of $25.00 will
     be assessed for checks made payable to Williams and returned for
     insufficient funds, For service billed on behalf of Williams, any
     applicable return check charges will be assessed according to the terms and
     conditions of Williams' billing agent.

5.5  BILLING DISPUTES. If Customer in good faith disputes any portion of an
     invoice it must pay the undisputed amount of the invoice on or before its
     Due Date and provide written notice to Williams of the billing dispute
     within sixty (60) calendar days thereafter. Such notice must include
     documentation substantiating the dispute. Customer's failure to notify
     Williams, of a dispute shall be deemed to be Customer's acceptance of such
     charges. The parties will make a good faith effort to resolve billing
     disputes as expeditiously as possible. If a dispute is resolved in favor of
     Customer, Customer shall receive a credit on their next bill for the amount
     determined to be due, if not, the additional sum due shall be payable no
     later than thirty (30) days following a determination that it is due.

5.6  VALIDATION OF CREDIT. Williams reserves the right to determine the
     creditworthiness of Customer through available verification procedures or
     sources and Customer hereby consents to Williams obtaining credit
     information regarding the Customer, its owners and affiliates.

5.7  WILLIAMS' RIGHT TO ASSURANCE.

     a.  If at any time there is a material adverse change in Customer's
         creditworthiness or a material adverse change in Customer's financial
         position, then in addition to any other remedies available to Williams,
         Williams may elect, in its sole discretion, to demand reasonable
         assurance of payment from Customer, including among others the posting
         of a deposit and executing an agreement with Williams regarding the use
         of any such deposit ("Deposit Agreement"), such Deposit Agreement to be
         in form and substance acceptable to Williams.

     b.  A material adverse change in Customer's creditworthiness shall include,
         but not limited to: (i) Customer's default of its obligations to
         Williams under this Agreement; (ii) failure of Customer to make full
         payment of charges due hereunder on or before the Due Date on two
         (2) or more occasions during any period of twelve (12) or fewer months;
         (iii) acquisition of Customer (whether in whole or by majority or
         controlling interest) by an entity which is insolvent or which is
         subject to bankruptcy or insolvency proceedings, or which owes past due
         amounts to Williams or any Williams affiliate, or which is a
         materially greater credit risk than Customer; or (iv) Customer's being
         subject to or having filed for bankruptcy or insolvency proceedings or
         the legal insolvency of Customer.

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     c.  A material adverse change in Customer's financial position shall
         include, but not limited to: (i) a decrease in net worth or working
         capital of five percent (5%) or greater during any calendar quarter;
         or, (ii) a negative net worth or working capital. If Customer's
         financial statements are not public information or have not otherwise
         been made available to Williams, then, upon Williams' request, Customer
         shall provide its most current audited and unaudited financial
         statements.

     d.  If Customer has not provided Williams with (i) its financial statements
         within ten (10) calendar days of Williams' request therefore or (ii) in
         the event of a Williams demand for assurance of payment, assurance
         satisfactory to Williams within ten (10) calendar days of Williams'
         notice of demand for such assurance, then, in addition to any other
         remedies available to Williams, Williams shall have the option, in its
         sole discretion, to exercise one or more of the following remedies:
         (x) cause the start of any Service described in any previously executed
         Service Order to be delayed pending receipt of such financial
         statements or of the satisfactory assurance; or (y) decline to accept a
         Service Order or other requests from Customer to provide Service; or
         (z) suspend all or any portion of the Service then being provided after
         giving Customer five (5) calendar days prior written notice. If
         Customer provides satisfactory assurance during the five (5) calendar
         day notice period, Williams will not suspend any Service.

5.8  CHARGES FOR SERVICES. All charges for Services shall be as set forth in
     this Agreement and may be established on an individual case basis as
     contemplated herein and shall be those in effect as of the date Williams'
     accepts the Service Order unless the charges are otherwise specifically set
     forth in attached Service Schedules. Customer shall be liable for all
     charges (recurring and non-recurring) for Services provided by Williams and
     by Third Party Providers. Additionally, Customer shall incur charges in
     those circumstances in which extraordinary costs and expenses are generated
     by Customer and reasonably incurred by Williams beyond those normally
     associated with the Services, including but not limited to, the following:
     (a) Customer's request to expedite Service availability to a date earlier
     than Williams' published installation interval or a previously accepted
     start date; (b) Service redesign or other activity occasioned by receipt of
     inaccurate information from Customer; (c) reinstallation charges following
     any suspension of the Service for cause by Williams; and (d) Customer's
     request for use of routes or facilities other than those selected by
     Williams for provision of the Service.

5.9  QUARTERLY PRICE REVIEW. Williams agrees that it will, upon the request of
     Customer and no more often than quarterly, review the actual rates as set
     forth in the attached Service Schedules, and may adjust such rates in
     accordance with:
         i)       prevailing market rates for substantially similar service at
                  the time of the review; and
         ii)      rates as published by other suppliers, delivering comparable
                  telecommunication services that are substantially similar to
                  the range of service offered by Williams under this Agreement.
     If the parties agree to any such adjustment, such adjustment shall be
     effective upon written amendment and shall not apply to orders, which have
     already been submitted by Customer and accepted by Williams.

5.10 TAXES.

a.       If any sales taxes, valued added taxes or other charges or impositions
         are asserted against Williams after, or as a result of, Customer's use
         of Services by any local, state, national, international, public or
         quasi-public governmental entity or foreign government or its political
         subdivision, including without limitation, any tax or charge levied to
         support the federal Universal Service Fund contemplated by the
         Telecommunications Act of 1996, or any state or foreign equivalent
         ("Additional Charges"), Customer shall be solely responsible for such
         Additional Charges. Customer agrees to pay any such Additional Charges
         and hold Williams harmless from any liability or expense associated
         with such Additional Charges.

     b.  If Customer has been granted a tax exemption for taxes in a given
         jurisdiction, then Williams shall not bill Customer for such taxes if
         Customer provides Williams with written verification of such tax
         exemption acceptable to Williams and properly issued by the relevant
         taxing jurisdiction. Service provided hereunder shall also not be
         subject to contribution to any universal service program if Customer
         provides Williams with written verification or exemption certificate,
         acceptable to Williams for the relevant jurisdiction, that the Service
         will be resold by Customer and that the revenues from such resale shall
         be subject to the universal service program's contribution
         requirements. If any jurisdiction, in conjunction with any universal
         service program, assesses any charges against, or seeks any
         contributions from, Williams in connection with any of the Service
         provided hereunder, Customer shall indemnify Williams against any such
         assessments or contributions.

                      ARTICLE 6. SUSPENSION AND TERMINATION

6.1  SUSPENSION OF SERVICE.

     a.  In the event payment in full is not received from Customer on or before
         the Due Date, Williams shall have the right: (i) upon providing a
         minimum of five (5) business days written notice (the "Suspension
         Notice"), to suspend or block, at

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         any time after such Suspension Notice, all or any portion of all the
         Services then being provided to Customer; and (ii) to immediately place
         any pending Service Orders on hold, and to decline to accept any new
         Service Orders or other requests from Customer to provide Service
         commencing on the day that Williams issues the Suspension Notice to
         Customer. If Williams receives the entire past due amount within the
         five (5) business days notice period, then Customer's Service shall not
         be suspended. Williams may continue such suspension until such time as
         Customer has paid in full all charges then due, including any
         reinstallation charges and/or late fees as specified herein. Following
         such payment, Williams shall reinstate Customer's Services subject to
         Williams' Right to Assurance as provided above in Section 5.6.

     b.  Suspension of Services as set forth in this Section shall not affect
         Customer's obligation to pay for the Services. Notwithstanding anything
         to the contrary in this Agreement, if Customer has agreed to a Revenue
         Commitment, any suspension of Service by Williams shall not relieve
         Customer of its obligations to pay the Revenue Commitment.

6.2  TERMINATION OF SERVICE.

     a.  In addition to its other termination rights hereunder, and with respect
         to all Services, either party may immediately disconnect any Services
         in whole or in part if Williams determines that such Services violate
         any law, statute, or ordinance, including the Communication Act of 1934
         (as amended), or that the imposition of any statute, or promulgation of
         any rule, regulation, or order of the Federal Communications Commission
         or other governing body makes Williams' performance under this
         Agreement commercially impracticable.

     b.  Except where Customer is in default, Williams recognizes that, upon the
         expiration or termination of this Agreement or any Service as defined
         in Section 2.1 and 2.2, a successor vendor may be retained to provide
         replacement telecommunication service to Customer. During Customer's
         migration to the successor vendor following the expiration or
         termination of this Agreement or a Service, Williams shall reasonably
         cooperate with Customer and the successor vendor in the development and
         execution of a plan for the orderly and efficient transition to the
         successor vendor.

6.3  TERMINATION OF AGREEMENT.

     a.  TERMINATION OF AGREEMENT FOR CAUSE. Except for an event of non-payment
         by Customer hereunder which is addressed in subsection (b) below,
         either party may terminate this Agreement if the other is in default of
         any material obligation contained herein, which default has not been
         cured within thirty (30) calendar days following the receipt of notice
         of such default setting forth the specifics of such default. The
         failure of any particular Service or Services to comply with the
         Technical Specifications set forth individually for each Service in the
         attached Service Schedules shall not be deemed a default by Williams,
         but may obligate Williams to provide Customer with Outage Credits, if
         applicable, under the relevant Service Schedule. Such Outage Credits
         and right to terminate for excessive outages, if applicable, shall be
         Customer's sole and exclusive remedy for any failure of the Services.
         Termination of this Agreement for cause does not relieve Customer of
         any obligations to pay Williams for charges accrued for Service which
         has been furnished up to the time of termination nor does it relieve
         the Customer of all applicable cancellation and/or disconnection
         charges.

     b.  TERMINATION OF AGREEMENT FOR NON-PAYMENT. In the event any amount
         payable by Customer has not been received in full by Williams on or
         before the Due Date (except for amounts disputed by Customer in
         accordance with Section 5.4 Billing Disputes), Williams shall have the
         right to terminate this Agreement ten (10) calendar days' written
         notice to the Customer. Termination of this Agreement pursuant to this
         subsection shall not relieve Customer of any obligations to pay
         Williams for charges accrued for Service which has been furnished up to
         the time of termination nor does it relieve the Customer of all
         applicable cancellation and/or disconnection charges or for payment of
         the Revenue Commitment Termination Charge. The remedies available to
         Williams for any such termination of the Agreement for non-payment
         shall be to collect from Customer all amounts due under this Agreement
         including but not limited to all applicable cancellation and/or
         disconnection charges and/or for payment of the Revenue Commitment
         Termination Charge.

     c.  TERMINATION DUE TO GOVERNMENT ACTION. Notwithstanding the foregoing,
         and upon written notice consistent with the mandate put forth by the
         applicable governmental authority or commission, to the other party,
         either Customer or Williams shall have the right, without incurring an
         Early Termination Charge or other liability to the other party, to
         immediately disconnect the affected portion of any Service, if Williams
         is prohibited by governmental authority from furnishing or Customer is
         prohibited from using such portion, or if any material rate or term
         contained herein and relevant to the affected portion of any Service is
         substantially changed by order of the highest court of competent
         jurisdiction to adjudicate the matter, the Federal Communications
         Commission, or other local, state, federal, or foreign government
         authority.

6.4  TERMINATION CHARGES.

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     a.  EARLY TERMINATION CHARGE. If Customer desires to disconnect any Service
         after installation, Customer may do so by providing written
         notification to Williams thereof thirty (30) days in advance of the
         effective date of the disconnection. In the event of such
         disconnection, Customer shall pay to Williams an "Early Termination
         Charge" in an amount equal to the monthly recurring charge for such
         disconnected Service multiplied by the number of months in the relevant
         Service Term, less the charges for such Service actually paid by
         Customer through the effective date of the disconnection plus any
         non-recurring payments not yet paid by Customer together with any
         termination liability associated with Third Party Local Access Service
         or any other Third Party Service.

      b.
              I.  PORTABILITY. After any Service has been in effect for a period
         of at least twelve (12) months and provided that Customer is in
         compliance with the terms and conditions of the Agreement, including
         the Revenue Commitment, Customer shall have the option to disconnect a
         circuit wholly on Williams' owned and operated network and order a new
         circuit also wholly on Williams' owned and operated network as a
         replacement, subject to availability, without incurring the Early
         Termination Charge set forth above. For purposes of this Agreement
         Williams owned and operated network will include facilities leased to
         Williams under an IRU agreement. The replacement circuit must be for
         the same or greater net value and same or greater monthly recurring
         charge as the circuit being replaced and the replacement circuit must
         be ordered by Customer within thirty (30) days after the date on which
         Customer provides Williams with written notice of termination. If
         Customer exercises this portability option, Customer will be liable for
         if applicable: (i) all termination liability charges for Third Party
         Local Access Services or any other Third Party Services or provided
         facilities that are impacted by the replacement of the circuit;
         (ii) installation charges due to Williams as set forth in the attached
         Service Schedules; and (iii) any one (1) time Third Party Local Access
         Service charges and the new monthly recurring Third Party Local Access
         Service charges.

                  II. SERVICE TERM ADJUSTMENT. After any Existing Circuit as set
         forth on Exhibit A has been in effect for a period of at least twelve
         (12) months and provided that Customer is in compliance with the terms
         and conditions of the Agreement, including the Revenue Commitment,
         Customer shall have the option to adjust the initial Service Term to a
         period equal to six months ("Adjusted Service Term"). The Adjusted
         Service Term applicable to an Existing Circuit(s) will start
         concurrently with the turn up and acceptance date of the new circuit or
         circuit(s). Customer shall effectuate the adjustment by placing a
         Service Order for a new circuit(s) wholly on Williams' owned and
         operated network, subject to availability. For purposes of this
         Agreement Williams owned and operated network will include facilities
         leased to Williams under an IRU agreement. The new circuit(s) must be
         for: a) a minimum Service Term of twelve months, b) the same or greater
         total Service Term value, and c) the same or greater monthly recurring
         charge as the adjusted Existing Circuit(s). If Customer exercises this
         Service Term adjustment option, it will only be applicable to the
         inter-exchange portion of the adjusted circuit that is wholly on
         Williams owned and operated network. Customer remains liable for Third
         Party charges including, without limitation, any Third Party local
         access termination charges, which will be passed through to the
         Customer. The new circuits shall be subject to ordering and
         provisioning as provided in Article 3 herein. For example: If Customer
         has (3) DS-3s which have been in effect for at least 12 months with 24
         months remaining on the Service Term and the remaining Service Term
         value of the DS-3s is $60,000, Customer may adjust the Service Term of
         those DS-3s to 6 months by placing a Service Order and by accepting
         Service of a circuit or circuits pursuant to Section 3.3 herein, that
         have: 1) a twelve month term and 2) a total MRC greater than or equal
         to those DS-3s and 3) a Service Term value greater than or equal to
         $60,000. The Service Term value shall be determined by multiplying the
         monthly recurring charge by the number of months remaining in the
         original Service Term for the applicable Existing Circuit(s).

     c.  REVENUE COMMITMENT TERMINATION CHARGE. If Customer has made a Revenue
         Commitment, the rates for Services and associated discounts are based
         on Customer's agreement to purchase Service for the entire Term of the
         Agreement. If Customer terminates the Agreement or breaches the
         Agreement prior to the end of the Term of the Agreement, Customer shall
         pay to Williams a "Revenue Commitment Termination Charge" as calculated
         below in addition to all applicable Early Termination Charges as set
         forth in Section 6.4 (a) above: The Revenue Commitment Termination
         Charge shall be calculated as follows: ($57,600,000 LESS the total
         monthly recurring charge for Applicable Services for which Customer has
         paid to Williams) multiplied by 40%. Such total will then be adjusted
         to reflect the net present value using 15% as the interest rate and
         calculated over the remaining term of the Agreement as of the date of
         such notice.

     d.  SERVICE MIGRATION. If customer wishes to upgrade to a higher bandwidth
         of service, Customer has forty-five (45) days from the turnup of the
         higher bandwidth circuit in which to groom existing circuits onto the
         higher bandwidth of service. During this forty-five (45) day period,
         the Customer will not be billed for the higher bandwidth. After the
         forty-five (45) day period from circuit turnup, billing for the higher
         bandwidth circuit commences, whether or not if the existing circuits
         have been disconnected and groomed onto the larger bandwidth.

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     e.  TECHNOLOGY MIGRATION. If, as a result of technological changes or
         improvements, Customer's services provided under the Agreement may be
         changed or improved upon, Williams agrees to allow Customer to migrate
         to new services as it applies under Section 6.4 (b) Portability.

     f.  LIQUIDATED DAMAGES. Customer agrees that the actual damages in the
         event of a disconnection pursuant to this Section 6.4 would be
         difficult or impossible to ascertain, and that the Early Termination
         Charges and Revenue Commitment Termination Charges, if any, in this
         Section 6.4 are intended to establish liquidated damages only and are
         not intended as penalties.

                       ARTICLE 7. LIMITATION OF LIABILITY

IN THE EVENT OF ANY BREACH OF THIS AGREEMENT OR ANY FAILURE OF THE SERVICES,
WHATSOEVER, NEITHER WILLIAMS NOR ANY WILLIAMS' PROVIDER (AS DEFINED IN SECTION
8.4 INDEMNITY) SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, SPECIAL,
ACTUAL, INCIDENTAL, PUNITIVE OR ANY OTHER DAMAGES, OR FOR ANY LOST PROFITS OF
ANY KIND OR NATURE WHATSOEVER, EVEN IF WILLIAMS OR THE WILLIAMS PROVIDER HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE OR LOSS. THIS LIMITATION ON
DIRECT DAMAGES SHALL NOT LIMIT CUSTOMER'S RIGHT TO RECEIVE OUTAGE OR DELAY
CREDITS IF APPLICABLE AND SHALL NOT LIMIT WILLIAMS LIABILITY FOR INDEMNITY OR
CONFIDENTIALITY OBLIGATIONS PURSUANT TO THIS AGREEMENT. EXCEPT FOR AMOUNTS DUE
PURSUANT TO THIS AGREEMENT, IN NO EVENT SHALL CUSTOMER BE LIABLE FOR ANY
INDIRECT, CONSEQUENTIAL, SPECIAL, INCIDENTAL, OR, PUNITIVE DAMAGES, OR FOR ANY
LOST PROFITS OF ANY KIND OR NATURE WHATSOEVER, EVEN IF WILLIAMS PROVIDER HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE OR LOSS.

                               ARTICLE 8. GENERAL

8.1  EXCLUSIVE REMEDIES. Except as otherwise specifically provided for herein,
     the remedies set forth in this Agreement comprise the exclusive remedies
     available to either party at law or in equity.

8.2  WARRANTY AND DISCLAIMER OF WARRANTY. WILLIAMS MAKES NO WARRANTY WITH
     RESPECT TO THE SERVICE OR ITS PERFORMANCE UNDER THIS AGREEMENT UNLESS
     EXPRESSLY SET FORTH IN THIS AGREEMENT, INCLUDING THE ATTACHED SERVICE
     SCHEDULES. WILLIAMS MAKES NO WARRANTY WITH RESPECT TO SWITCHED AND CARRIER
     VOICE SERVICES. WITH THE EXCEPTION OF THE EXPRESS WARRANTIES, IF ANY, SET
     FORTH IN THE SERVICE SCHEDULES, WILLIAMS DISCLAIMS ALL WARRANTIES WHETHER
     EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTY OF
     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. NO WARRANTY IS MADE
     OR PASSED ON WITH RESPECT TO ANY THIRD PARTY SERVICES.

8.3  COMPLIANCE WITH LAW. Each Party agrees that its provision of and/or use of
     the Services shall be in accordance, and comply, with all applicable laws,
     regulations, and rules and that it shall obtain all approvals, consents and
     authorizations necessary to conduct its business and initiate or conduct
     any transmissions over any Services covered by this Agreement. Each Party
     may, exercisable in its sole discretion, disconnect any Service or restrict
     any transmission, if such actions are reasonably appropriate to assure that
     is not in violation of any civil or criminal law, regulation or rule.

8.4  INDEMNITY.

     a.  Customer and Williams shall defend, indemnify and hold harmless the
         other and their respective officers, directors, employees, contractors
         and agents against and from any and all claims for damage to tangible
         property or bodily injury, including claims for wrongful death, to the
         extent that such claim arises out of the gross negligence or willful
         misconduct of the respective indemnifying Party, its employees, agents,
         or contractors in connection with this Agreement or the provision of
         Services hereunder.

     b.  Customer and Williams will defend, indemnify and hold harmless the
         other Party and their respective officers, directors, employees,
         contractors and agents against and from any loss, debt, liability,
         damage, obligation, claim, demand, judgment or settlement of any nature
         or kind, known or unknown, liquidated or unliquidated, including
         without limitation, all reasonable costs and expenses incurred
         including all reasonable litigation costs and attorneys' fees
         (collectively, "Damages") arising out of, resulting from or based upon
         any complaint, claim, action, proceeding or suit of any third

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         party, including any governmental authority, (a "Claim"), to the extent
         such Claim arises from or is based on the indemnifying Party's
         violation of any law or any rule or regulation.

     c.  Customer will defend, indemnify and hold harmless Williams and its
         respective officers, directors, employees, contractors and agents for
         all Damages resulting from any Claims by any third party or end user
         for who is using the Services through Customer, including without
         limitation, any Claims by such end users for damages arising or
         resulting from any defect or failure to provide the Services.

     d.  Customer will defend indemnify and hold harmless Williams and its
         respective officers, directors, employees, contractors and agents for
         all Damages resulting from any Claims by any third party arising out of
         the content transmitted over Williams' network or otherwise including
         but not limited Claims relating to any violation of copyright law,
         export control laws, failure to procure any necessary consents, or that
         such transmissions are libelous, slanderous, an invasion or privacy or
         illegal.

     e.  If the equipment and facilities used in furnishing the Services to
         Customer pursuant to this Agreement infringe any United States
         copyright, patent, trade secret or any other intellectual property
         rights, Williams shall indemnify, defend and hold Customer harmless
         from and against any claims made as a consequence of any such
         infringement However, Williams obligation to indemnify, defend, and
         hold harmless Customer will not apply if any such infringement arises
         due to (a) the modification or combination of such equipment and
         facilities with (i) equipment or facilities furnished by Customer, or
         (ii) equipment or facilities of Williams or its third party supplier's
         network, or (b) Customer's use of the Services in violation of this
         Agreement. Moreover, if the equipment or facilities furnished by
         Williams to provide the Services under this Agreement becomes, or in
         Williams opinion is likely to become, the subject of a claim of
         infringement, or if Customer's use of the Services is finally enjoined
         or in Williams opinion is likely to be enjoined, Williams may in its
         sole discretion provide alternate Services which are not subject to the
         claim of infringement. If Williams elects not to provide alternate
         Service(s), Customer may terminate the Service without liability for
         the Early Termination Charge set forth in Section 6.4 of the Agreement.
         However, Customer shall be liable for any termination liability
         associated with Third Party Local Access Service or any other Third
         Party Service associated with such disconnection. In the event Customer
         terminates a circuit pursuant to this Section, such terminated circuit
         shall count toward Customer's Revenue Commitment as if it had not been
         terminated.

     f.  The indemnified Party shall promptly notify the indemnifying Party in
         writing of any claims, which are subject to the terms of this Section
         8.4. The indemnified Party shall have the right at its own expense to
         appoint its own counsel who shall be entitled to participate in any
         settlement negotiations or litigation regarding any matter for which it
         is entitled to be indemnified hereunder. The indemnifying Party shall
         not agree to any settlement or consent to any decree, order or judgment
         without obtaining the consent of the indemnified Party which consent
         shall not be unreasonably withheld.

8.5  FORCE MAJEURE. If either party's performance of this Agreement or any
     obligation (other than the obligation to make payments) hereunder is
     prevented, restricted or interfered with by causes beyond its reasonable
     control including, but not limited to, acts of God, fire, explosion,
     vandalism, cable cut, power outage, storm or other similar occurrence
     including rain fade or other atmospheric conditions, any law, order,
     regulation, direction, action or request of any government, or of any
     department, agency, commission, court, bureau, corporation or other
     instrumentality of any one or more of said governments, or of any civil or
     military authority, or by national emergencies, insurrections, riots, wars,
     acts of terrorism, strikes, lockouts or work stoppages or other labor,
     supplier failures, shortages, breaches or delays, then the party that is
     unable to perform or meet its obligations due to such causes shall be
     excused from such performance on a day-to-day basis to the extent of such
     prevention, restriction or interference. The party that is unable to
     perform or meet its obligations due to such causes shall use commercially
     reasonable efforts under the circumstances to avoid and remove such causes
     of non-performance and shall proceed to perform with reasonable dispatch
     whenever such causes cease. In the event the force majeure event prevents
     the use of any circuit provided as part of the Williams' Services and such
     force majeure event continues for a period of sixty (60) days, then either
     party may disconnect the affected circuit without incurring liability
     except for Customer's liability for any charges of a Third Party Provider
     that are incurred by Williams will be passed through to Customer.

8.6  PROPRIETARY INFORMATION.

     a.  Williams and Customer understand and agree that the terms and
         conditions of this Agreement and all documents referenced herein
         (including invoices to Customer for Services provided hereunder) are
         confidential as between Customer and Williams. Neither Customer nor
         Williams shall disclose such information to any third party without the
         prior written consent of the other, except as provided in Section
         8.6(c) below.

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     b.  In addition to the matters covered under clause a. above, when
         confidential information is furnished in a tangible form by one party
         to the other, the disclosing party shall mark the information in a
         manner to indicate that it is considered confidential. When information
         deemed to be confidential is provided orally, the disclosing party
         shall, at the time of disclosure, clearly identify the information as
         being confidential. If the disclosing party fails to identify
         information as confidential, such disclosing party may correct the
         omission by later notice consisting of a writing or statement, and the
         receiving party shall only be liable for unauthorized disclosures of
         such confidential information made subsequent to said notice. All
         information identified as confidential pursuant to this clause b. shall
         not be disclosed by the receiving party to any third party without the
         written consent of the disclosing party, except as provided in Section
         8.6(c) below.

     c.  The party to whom confidential information is disclosed shall have no
         obligation to preserve the confidential nature of such information if
         it: (i) was previously known to such party free of any obligation to
         keep it confidential; (ii) is or becomes publicly available by other
         than unauthorized disclosure; (iii) is developed by or on behalf of
         such party independent of any information furnished under this
         Agreement; or (iv) is received from a third party whose disclosure does
         not violate any confidentiality obligation. Each Party may disclose
         confidential information regarding its relationship with the other
         party to commercial lenders who have specifically agreed to hold such
         information in confidence. In addition, a party may disclose
         confidential information provided to it by the other party if such
         disclosure is made pursuant to the requirement or request of a
         recognized stock exchange or of a governmental agency or court of
         competent jurisdiction to the extent such disclosure is required by a
         valid law, regulation or court order, and provided further, that,
         prompt notice thereof is given (unless such notice is prohibited by
         law) to the disclosing party of any such requirement or request.

8.7  REPRESENTATIONS.

     a.  Unless Williams specifically offers an intrastate Service as set forth
         in an applicable Service Schedule, Williams requires that more than ten
         percent (10%) of the transmissions on each circuit shall be interstate
         transmissions or foreign transmissions as those terms are defined in 47
         U.S.C. Sections 153(17) and 153(22). Williams and its affiliates shall
         not be obligated to make available intrastate Service, e.g., any
         Service on a circuit with end points within a single state or service
         on a circuit which originates/terminates at points both of which are
         situated within a single state unless Customer represents in writing
         that such interexchange Service or circuits shall be used to carry more
         than ten percent (10%) interstate or foreign telecommunications. If it
         is determined at any time that such Service or circuit is subject to
         regulation by a U.S. State regulatory agency, the Service or circuit
         may be provided by Williams or its affiliates pursuant to applicable
         state laws, regulations and applicable tariffs, or Williams and its
         affiliates may discontinue provision of the affected Service or
         circuit.

     b.  USE OF SERVICES.

         (i) Customer represents that it is a telecommunications carrier under
         the Communications Act of 1934, as amended or under the laws of the
         jurisdiction where it operates. The parties do not contemplate, as of
         the Effective Date, the filing of any tariff as to the Services
         provided under this Agreement, however, in the event that due to a
         court or agency ruling, or change in applicable law or regulation, this
         Agreement becomes subject to a requirement of an FCC tariff, then
         Williams will file a contract tariff with the FCC incorporating all of
         the material terms and conditions of this Agreement, including pricing,
         and the parties agree to abide by that contract tariff. Service may
         also be subject to tariffs in jurisdictions outside of the United
         States, and Williams' reserves the right to make its provision of
         Services subject to such tariff terms. Customer represents that it has
         taken all actions required by the FCC to operate as a
         telecommunications carrier under the Communications Act of 1934, as
         amended. Customer may engage in resale of international private lines
         for the provision of a switched, basic telecommunication service only
         upon authorization from the FCC under Section 214 of the Communications
         Act of 1934, as amended, and provided that the private line is used
         only (i) on a route where Customer exchanges switched traffic with a
         foreign carrier that the FCC has determined lacks market power; or (ii)
         on any route for with the FCC has authorized the provision of switched
         services over international private lines. Service shall not be used
         for any unlawful purpose.

         (ii) Customer is responsible for ensuring that it and its customers
         comply with Williams' Acceptable Use Policy ("AUP and Customer agrees
         to be bound by the AUP as set forth in Exhibit B. Any material
         violation of the AUP shall constitute a breach of this Agreement.

     c.  CUSTOMER FACILITIES. Customer has sole responsibility for installation,
         testing and operation of facilities, services and equipment ("Customer
         Facilities") other than those specifically provided by Williams as part
         of the Services as described in a Service Order. In no event will the
         untimely installation or non-operation of Customer Facilities relieve
         Customer of its obligation to pay charges for the Services after
         Customer's acceptance or deemed acceptance.

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     d.  UNIVERSAL SERVICE EXEMPTION. During the Term or Renewal Term of this
         Agreement, Customer shall provide Williams, on a semiannual basis, a
         universal service exemption certificate within thirty (30) days of the
         Customer's filing of the universal service filing made with the
         appropriate federal agency, evidencing that the Customer is required to
         contribute to the federal Universal Service Fund. Customer agrees that
         failure to provide such an exemption authorizes Williams to begin
         billing Customer prospectively for Universal Service Fund contributions
         pursuant to the applicable contribution factor (revised quarterly),
         plus an administrative charge of one percent (1%).

8.8  TITLE TO EQUIPMENT. This Agreement shall not, and shall not be deemed to,
     convey to the other party title of any kind to any of the transmission
     facilities, digital encoder/decoders, telephone lines, microwave facilities
     or other facilities utilized in connection with the Services.

8.9  NOTICES. All legal notices to be sent to a party pursuant to this Agreement
     shall be in writing and deemed to be effective upon (i) personal delivery,
     (ii) three (3) business days after mailing certified mail return receipt
     requested if mailed within the domestic U.S., or (iii) one day after
     mailing by express mail priority, next-day delivery. The Full Business
     Address for purposes of notice under this Section as well as telephone
     voice and facsimile numbers shall be:

         Williams Communications, LLC         Universal Access, Inc.
         100 South Cincinnati                 233 South Wacker Drive, Suite 600
         One Technology Center, 6th Floor     Chicago, Illinois 60606
         Tulsa, Oklahoma 74103
         Telephone: (918) 547-2005            Telephone:  (312) 660-5000
         Fax: (918) 547-0460                  Fax: (312) 660-1290
         Attention: Contract Management       Attention: General Counsel

         With a copy to:                      For billing issues to:
         General Counsel                      Universal Access, Inc
         Williams Communications, LLC         23 South Wacker Drive, Suite 600
         One Williams Center, 41st Floor      Chicago, Illinois 60606
         Tulsa, Oklahoma 74172
         Telephone:  (918) 573-5057           Telephone:  (312) 881-4140
         Fax:  (918) 573-3005                 Fax: (312) 660-6296
                                              Attention: Controller

8.10 WRITTEN AMENDMENT. Any addition, deletion or modification to this Agreement
     shall not be binding on either party except by written amendment executed
     by authorized representatives of both parties.

8.11 NO VENTURE. The provision of Services shall not create a partnership or
     joint venture between the parties. The parties hereto are independent
     contractors.

8.12 ASSIGNMENT. Customer shall not assign or otherwise transfer its rights or
     obligations under this Agreement without the prior written consent of
     Williams, which shall not be unreasonably withheld. However, Customer may
     assign or otherwise transfer this Agreement, upon notice to Williams, to an
     entity that acquires a controlling interest in Customer through assignment,
     merger, sale or other transfer (provided that, prior to assignment or
     transfer, (i) Customer is not in breach of this Agreement and no amounts
     due under this Agreement are past due, (ii) such entity is reasonably
     determined by Williams to be at least as creditworthy as Customer and
     (iii) that such entity is subject to Section 5.5, Validation of Credit).
     Any assignment or transfer of Customer's rights or obligations inconsistent
     with this paragraph shall entitle Williams to terminate the Services or
     Third Party Local Access Services provided hereunder at its option upon ten
     (10) days prior written notice to Customer in accordance of 6.3 (a).

8.13 CHOICE OF LAW. This Agreement shall be governed by the laws of the State of
     New York, U.S. without regard to choice of law principles.

8.14 INTERPRETATION. No rule of construction requiring interpretation against
     the draftsman hereof shall apply in the interpretation of this Agreement.

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8.15 PRIORITY OF AGREEMENT AND SCHEDULES. In the event of any inconsistency
     between or among a Service Order, a Service Schedule, this Agreement and
     any applicable tariff, the following order of precedence shall prevail
     (from highest priority to lowest): the applicable tariff, if any, this
     Agreement, a Service Schedule, a Service Order, and Exhibits.

8.16 NO THIRD PARTY BENEFICIARY. The provisions of this Agreement are for the
     benefit only of the parties hereto, and no third party may seek to enforce
     or benefit from these provisions.

8.17 COSTS AND ATTORNEYS' FEES. If a proceeding is brought for the enforcement
     of this Agreement or because of any alleged or actual dispute, breach,
     default or misrepresentation in connection with any of the provisions of
     this Agreement, the prevailing party shall be entitled to recover
     reasonable attorneys' fees and other reasonable costs and expenses incurred
     in such action or proceeding in addition to any other relief to which such
     party may be entitled.

8.18 SEVERABILITY. If any term or provision of this Agreement shall, to any
     extent, be determined to be invalid or unenforceable by a court or body of
     competent jurisdiction, then (a) both parties shall be relieved of all
     obligations arising under such provision and this Agreement shall be deemed
     amended by modifying such provision to the extent necessary to make it
     valid and enforceable while preserving its intent, and (b) the remainder of
     this Agreement shall be valid and enforceable.

8.19 NO WAIVER. The failure of either party to enforce any provision hereof
     shall not constitute the permanent waiver of such provision.

8.20 PUBLICITY AND REFERENCES. Subject to Section 8.6 Proprietary Information,
     the parties contemplate and agree that publication of information relating
     to this Agreement may occur through press releases, articles, interviews,
     marketing materials, online materials, and/or speeches ("Publicity"). Both
     parties must approve the content of any such Publicity prior to its
     publication, which approval shall not be unreasonably withheld. No public
     statements or announcements relating to this Agreement shall be issued by
     either party without the prior written consent of the other party

8.21 HEADINGS. Descriptive headings contained in this Agreement are for
     convenience and not intended as substantive portions of the Agreement. Such
     headings shall have no affect upon the construction of the Agreement.

8.22 INDUSTRY TERMS. The parties intend that words having well-known technical
     or trade meanings shall be accorded such meaning, unless expressly defined
     otherwise.

8.23 DEFINITIONS. For purposes of this Agreement, capitalized words and phrases
     shall have the respective meanings assigned to them in this Agreement.

8.24 COUNTERPARTS. This Agreement may be executed in one or more counterparts,
     each of which shall be deemed an original and all of which together shall
     constitute one and the same agreement. Facsimile signatures shall be deemed
     original signatures.

8.25 GENERAL APPLICABILITY OF PROVISIONS. Unless expressly excluded, all terms
     of this Agreement are applicable to all sections of this Agreement,
     notwithstanding the specific reference to such a term in any other
     particular section.

8.26 INTELLECTUAL PROPERTY RIGHTS. Unless otherwise specifically agreed in
     writing by the parties, each party shall retain all right, title and
     interest in and to any intellectual property associated with the provision
     of Services. If it should be necessary for a party to practice any patent,
     copyright, trade secret or other non-trademark intellectual property of the
     other party to avail itself of the Services, the parties shall negotiate in
     good faith a license with respect to such intellectual property. Each party
     acknowledges that the other party's name is proprietary to the other party.
     This Agreement does not transfer, and confers no right to use, the name,
     trademarks (including service marks), patents, copyrights, trade secrets,
     other intellectual property of either party, except as expressly provided
     herein. Neither party shall take any action inconsistent with the
     intellectual property rights of the other party.

8.27 SURVIVAL OF TERMS. No termination of this Agreement shall affect the rights
     or obligations of either party: (a) with respect to any payment for
     services rendered before termination or credits or refunds owed; or (b)
     pursuant to other provisions of this Agreement that, by their sense and
     context, are intended to survive termination of this Agreement, including
     without limitation, indemnification and limitation of liability.

8.28 MERGER/INTEGRATION. This Agreement consists of all the terms and conditions
     contained herein and in documents incorporated herein specifically by
     reference. This Agreement constitutes the complete and exclusive statement
     of the understanding between the parties and supersedes all proposals and
     prior agreements (oral or written) between the parties relating to Services
     provided hereunder. This Agreement is not intended to supercede those
     Agreements entered into by the parties

                        Williams Communications                    Page 14 of 15
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                            MASTER SERVICES AGREEMENT

     contemporaneously herewith, including the Letter Agreement, the Collocation
     Agreement, and the Consulting Services Agreement.

[Remainder of page left intentionally blank]

                        Williams Communications                    Page 15 of 15
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                            MASTER SERVICES AGREEMENT

IN WITNESS WHEREOF, the parties hereto have executed this Master Services
Agreement effective as of the day and year first above written. The offer
expressed in this Agreement is extended to Customer for thirty (30) calendar
days from date of Williams' signature, but such offer shall expire immediately
following such thirty (30) calendar day period.

  UNIVERSAL ACCESS, INC.:            WILLIAMS COMMUNICATIONS, LLC:

 /s/ Robert E. Rainone                /s/ Howard Janzen
 --------------------------------     -----------------------------------------
 Signature of Authorized              Signature of Authorized
 Representative                       Representative
 Robert E. Rainone                    Howard Janzen
 --------------------------------     -----------------------------------------
 Printed Name                         Printed Name
 President, Global Operations         President and Chief Executive Officer
 --------------------------------     -----------------------------------------
 Title                                Title
 10/03/01                             10/03/01
 --------------------------------     -----------------------------------------
 Date of Signature                    Date of Signature

                        Williams Communications                    Page 15 of 15
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                    EXHIBIT A
                                EXISTING CIRCUITS

<Table>
<Caption>
       ---------------------------------------------------------------------------------------------------------------------------
          Circuit ID    Circuit Status     Term in        Product          Date      Service Type     Location       Location
                                            Months         Type          Completed                     A City         Z City
       ---------------------------------------------------------------------------------------------------------------------------
       <S>                  <C>               <C>           <C>           <C>        <C>            <C>             <C>
       TWC00004271          Active            60            DS3           29-Mar-99  Private Line   New York City      Miami
       ---------------------------------------------------------------------------------------------------------------------------
       TWC00005351          Active            60            DS3           16-Apr-99  Private Line    Washington       Atlanta
       ---------------------------------------------------------------------------------------------------------------------------
       TWC00005352          Active            60            DS3           16-Apr-99  Private Line      Hudson         Atlanta
       ---------------------------------------------------------------------------------------------------------------------------
       TWC0000613           Active            60            DS3           07-Jan-99  Private Line      Chicago        Denver
       ---------------------------------------------------------------------------------------------------------------------------
       TWC0000653           Active            60            DS3           13-Nov-98  Private Line     Columbus      Washington
       ---------------------------------------------------------------------------------------------------------------------------
       TWC0000665           Active            60            DS3           19-Nov-98  Private Line      Chicago        Detroit
       ---------------------------------------------------------------------------------------------------------------------------
       TWC0000666           Active            60            DS3           05-Nov-98  Private Line     Cleveland       Detroit
       ---------------------------------------------------------------------------------------------------------------------------
       TWC0000680           Active            60            DS3           28-Sep-98  Private Line   San Francisco    San Jose
       ---------------------------------------------------------------------------------------------------------------------------
       TWC0000681           Active            60            DS3           03-Dec-98      ATM           Chicago       Broadview
       ---------------------------------------------------------------------------------------------------------------------------
       TWC00006933          Active            60            OC3           11-Jun-99  Private Line     San Jose        Seattle
       ---------------------------------------------------------------------------------------------------------------------------
       TWC002171            Active            60            DS3           02-Nov-98  Private Line       Miami      Jacksonville
       ---------------------------------------------------------------------------------------------------------------------------
       TWC003115            Active            60            DS3           25-May-99  Private Line      Boston        Manhattan
       ---------------------------------------------------------------------------------------------------------------------------
       TWC110593            Active            12            DS3           10-Sep-99  Private Line      Hudson      New York City
       ---------------------------------------------------------------------------------------------------------------------------
       TWC136842            Active            60            DS3           30-Dec-99  Private Line    Los Angeles     San Diego
       ---------------------------------------------------------------------------------------------------------------------------
       TWC147240            Active            36            DS3           11-Feb-00  Private Line    Los Angeles     San Diego
       ---------------------------------------------------------------------------------------------------------------------------
       TWC155665            Active            60            DS3           28-Jan-00  Private Line       Akron         Detroit
       ---------------------------------------------------------------------------------------------------------------------------
       TWC161758            Active            60            DS3           19-Jan-00  Private Line       Akron       Cincinnati
       ---------------------------------------------------------------------------------------------------------------------------
       TWC164440            Active            60            DS3           25-Feb-00  Private Line      Chicago     Indianapolis
       ---------------------------------------------------------------------------------------------------------------------------
       TWC248104            Active            12            DS1           15-Aug-00  Private Line     Cleveland     Cincinnati
       ---------------------------------------------------------------------------------------------------------------------------
       TWC248230            Active            12            DS1           15-Aug-00  Private Line     Cleveland     Cincinnati
       ---------------------------------------------------------------------------------------------------------------------------
       TWC262353            Active            60            DS3           23-Jun-00  Private Line     Charlotte       Mclean
       ---------------------------------------------------------------------------------------------------------------------------
       TWC262924            Active            60            DS1           24-May-00  Private Line   New York City  Philadelphia
       ---------------------------------------------------------------------------------------------------------------------------
       TWC262953            Active            60            DS1           24-May-00  Private Line      Raleigh        Reston
       ---------------------------------------------------------------------------------------------------------------------------
       TWC272307            Active            60            DS1           31-Aug-00  Private Line     Manhattan      Stamford
       ---------------------------------------------------------------------------------------------------------------------------
       TWC272308            Active            60            DS1           15-Sep-00  Private Line     Manhattan      Stamford
       ---------------------------------------------------------------------------------------------------------------------------
       TWC285568            Active            24            DS1           03-Jul-00  Private Line    Minneapolis    Minneapolis
       ---------------------------------------------------------------------------------------------------------------------------
       TWC290208            Active            60            DS1           04-Aug-00  Private Line    Los Angeles  Salt Lake City
       ---------------------------------------------------------------------------------------------------------------------------
       TWC369045            Active            12            DS3           17-Jan-01  Private Line    Washington      Baltimore
       ---------------------------------------------------------------------------------------------------------------------------
       TWC369159            Active            12            DS3           17-Jan-01  Private Line    Washington      Baltimore
       ---------------------------------------------------------------------------------------------------------------------------
       TWC374878            Active            24           OC12           14-Mar-01  Private Line    Sacramento     Los Angeles
       ---------------------------------------------------------------------------------------------------------------------------
       TWC376178            Active            12            DS3           01-Dec-00  Private Line      Phoenix        Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC377962            Active            12            DS3           09-Jan-01  Private Line    Kansas City      Topeka
       ---------------------------------------------------------------------------------------------------------------------------
       TWC378709            Active            12            DS1           04-Dec-00  Private Line    Los Angeles    Santa Clara
       ---------------------------------------------------------------------------------------------------------------------------
       TWC388705            Active            12            DS1           06-Dec-00  Private Line      Denver       Los Angeles
       ---------------------------------------------------------------------------------------------------------------------------
       TWC392921            Active            12            DS3           31-Jan-01  Private Line      Denver         Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC394029            Active            36            DS1           24-Jan-01  Private Line      Hudson       Washington
       ---------------------------------------------------------------------------------------------------------------------------
       TWC394040            Active            12            DS1           29-Jan-01  Private Line    Santa Clara   New York City
       ---------------------------------------------------------------------------------------------------------------------------
       TWC417182            Active            60            DS1           25-Jan-01  Private Line      Herndon      Minneapolis
       ---------------------------------------------------------------------------------------------------------------------------
       TWC431996            Active            12            DS1           21-Mar-01  Private Line      Herndon        Atlanta
       ---------------------------------------------------------------------------------------------------------------------------
       TWC431998            Active            12            DS1           04-Apr-01  Private Line      Newark      Philadelphia
       ---------------------------------------------------------------------------------------------------------------------------
</Table>

                        Williams Communications                      Page 1 of 3
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                    EXHIBIT A
                                EXISTING CIRCUITS

<Table>
<Caption>
       ---------------------------------------------------------------------------------------------------------------------------
          Circuit ID    Circuit Status     Term in        Product          Date      Service Type     Location       Location
                                            Months          Type         Completed                      A City         Z City
       ---------------------------------------------------------------------------------------------------------------------------
       <S>                  <C>               <C>           <C>           <C>        <C>            <C>            <C>
       TWC436486            Active            12            DS1           14-Mar-01  Private Line    Los Angeles      Houston
       ---------------------------------------------------------------------------------------------------------------------------
       TWC438927            Active            12            DS1           14-Mar-01  Private Line    Los Angeles      Houston
       ---------------------------------------------------------------------------------------------------------------------------
       TWC446073            Active            12            DS1           17-Apr-01  Private Line    Los Angeles   San Francisco
       ---------------------------------------------------------------------------------------------------------------------------
       TWC446829            Active            12            DS1           05-Apr-01  Private Line   New York City     Newark
       ---------------------------------------------------------------------------------------------------------------------------
       TWC446876            Active            12            DS3           27-Apr-01  Private Line   New York City     Chicago
       ---------------------------------------------------------------------------------------------------------------------------
       TWC447643            Active            12           STM1           02-Apr-01  Private Line     Los Osos      Santa Clara
       ---------------------------------------------------------------------------------------------------------------------------
       TWC447646            Active            12           STM1           02-Apr-01  Private Line     Los Osos      Santa Clara
       ---------------------------------------------------------------------------------------------------------------------------
       TWC447649            Active            12           STM1           30-Mar-01  Private Line     Los Osos      Santa Clara
       ---------------------------------------------------------------------------------------------------------------------------
       TWC447650            Active            12           STM1           30-Mar-01  Private Line     Los Osos      Santa Clara
       ---------------------------------------------------------------------------------------------------------------------------
       TWC448875            Active            12            DS1           31-May-01  Private Line      Herndon        Raleigh
       ---------------------------------------------------------------------------------------------------------------------------
       TWC448965            Active            12            DS1           03-May-01  Private Line      Dallas      W. Palm Beach
       ---------------------------------------------------------------------------------------------------------------------------
       TWC450682            Active            12            DS1           18-May-01  Private Line    Los Angeles      Denver
       ---------------------------------------------------------------------------------------------------------------------------
       TWC450745            Active            12            DS1           18-May-01  Private Line    Los Angeles      Denver
       ---------------------------------------------------------------------------------------------------------------------------
       TWC453307            Active            12            DS3           11-Apr-01  Private Line    Los Angeles    Santa Clara
       ---------------------------------------------------------------------------------------------------------------------------
       TWC460834            Active            12            DS1           23-May-01  Private Line   New York City     Herndon
       ---------------------------------------------------------------------------------------------------------------------------
       TWC460836            Active            12            DS1           23-May-01  Private Line   New York City     Herndon
       ---------------------------------------------------------------------------------------------------------------------------
       TWC473511            Active            12            DS1           29-May-01  Private Line      Dallas       Los Angeles
       ---------------------------------------------------------------------------------------------------------------------------
       TWC481652            Active            12            DS1           05-Jun-01  Private Line    Los Angeles   New York City
       ---------------------------------------------------------------------------------------------------------------------------
       TWC494926            Active            12            DS1           29-Jun-01  Private Line    Los Angeles     Portland
       ---------------------------------------------------------------------------------------------------------------------------
       TWC495030            Active            12            DS1           29-Jun-01  Private Line    Los Angeles     Portland
       ---------------------------------------------------------------------------------------------------------------------------
       TWC515174            Active            12            DS1           09-Jul-01  Private Line      Newark         Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC515175            Active            12            DS1           09-Jul-01  Private Line      Newark         Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC515178            Active            12            DS1           10-Jul-01  Private Line      Newark         Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC531956            Active            12            DS1           31-Jul-01  Private Line   New York City     Atlanta
       ---------------------------------------------------------------------------------------------------------------------------
       TWC531981            Active            12            DS1           31-Jul-01  Private Line   New York City     Atlanta
       ---------------------------------------------------------------------------------------------------------------------------
       TWC532202            Active            12            DS1           27-Jul-01  Private Line   New York City     Boston
       ---------------------------------------------------------------------------------------------------------------------------
       TWC532231            Active            12            DS1           18-Jul-01  Private Line   New York City     Herndon
       ---------------------------------------------------------------------------------------------------------------------------
       TWC532288            Active            12            DS1           18-Jul-01  Private Line   New York City     Herndon
       ---------------------------------------------------------------------------------------------------------------------------
       TWC532362            Active            12            DS1           18-Jul-01  Private Line   New York City     Herndon
       ---------------------------------------------------------------------------------------------------------------------------
       TWC532696            Active            12            DS1           27-Jul-01  Private Line   New York City     Boston
       ---------------------------------------------------------------------------------------------------------------------------
       TWC642584           Pending            12            DS3           28-Sep-01  Private Line      Buffalo      Minneapolis
       ---------------------------------------------------------------------------------------------------------------------------
       TWC609843           Pending            12            DS1           15-Oct-01  Private Line   San Francisco     Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC612459           Pending            12            DS1           19-Oct-01  Private Line       Miami         Herndon
       ---------------------------------------------------------------------------------------------------------------------------
       TWC612417           Pending            12            DS1           10-Oct-01  Private Line    Minneapolis      Chicago
       ---------------------------------------------------------------------------------------------------------------------------
       TWC612453           Pending            12            DS1           24-Oct-01  Private Line    Los Angeles      Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC612461           Pending            12            DS1           24-Oct-01  Private Line   San Francisco     Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC615271           Pending            12            DS1           24-Oct-01  Private Line   San Francisco     Dallas
       ---------------------------------------------------------------------------------------------------------------------------
       TWC615270           Pending            12            DS1           24-Oct-01  Private Line      Dallas         Anaheim
       ---------------------------------------------------------------------------------------------------------------------------
       TWC620395           Pending            12            DS1           30-Oct-01  Private Line      Newark      Ft. Lauderdale
       ---------------------------------------------------------------------------------------------------------------------------
       TWC592127           Pending            12            DS1            2-Nov-01  Private Line   New York City      Miami
       ---------------------------------------------------------------------------------------------------------------------------
       TWC645368           Pending            12            DS3            2-Nov-01  Private Line   New York City     Newark
       ---------------------------------------------------------------------------------------------------------------------------
</Table>

                        Williams Communications                      Page 2 of 3
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                    EXHIBIT A
                                EXISTING CIRCUITS

<Table>
<Caption>
       ---------------------------------------------------------------------------------------------------------------------------
          Circuit ID    Circuit Status     Term in        Product          Date      Service Type     Location       Location
                                            Months         Type          Completed                     A City         Z City
       ---------------------------------------------------------------------------------------------------------------------------
       <S>                 <C>                <C>          <C>            <C>        <C>            <C>              <C>
       TWC645369           Pending            12            DS3            2-Nov-01  Private Line   New York City     Newark
       ---------------------------------------------------------------------------------------------------------------------------
       TWC645370           Pending            12            DS3            2-Nov-01  Private Line   New York City     Newark
       ---------------------------------------------------------------------------------------------------------------------------
       TWC634109           Pending            12           OC12           28-Sep-01  Private Line      Seattle       Palo Alto
       ---------------------------------------------------------------------------------------------------------------------------
       TWC637937           Pending            12            DS1           15-Nov-01  Private Line      Herndon        Chicago
       ---------------------------------------------------------------------------------------------------------------------------
</Table>

                        Williams Communications                      Page 3 of 3
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                    EXHIBIT B
               SERVICE DELIVERY PROCESS AND ACCEPTABLE USE POLICY

CUSTOMER SERVICE
SERVICE DELIVERY PROCESSES

SERVICE ORDERS AND PROVISIONING OF CIRCUITS

Data Circuits and Voice Grade Dedicated Access Line Circuits: Service Orders. A
Customer's request for service shall be made on Williams' Service Order forms in
effect from time to time or on Customer's forms which have previously been
accepted in writing by Williams ("Service Order(s)"). Each Service Order shall
reference the written agreement ("Agreement") between Williams and the Customer
regarding the provision of telecommunication service ("Service") and the
Customer's Agreement number. Williams will accept any Service Order under the
Customer's Agreement that comports with the terms and conditions set forth in
such Customer's Agreement and as otherwise set forth herein, subject to
availability and credit approval at the time Customer places such Service Order.

REQUESTED START DATE. When a Service Order is placed, Customer will designate:
(i) a requested start date ("Requested Start Date") for the Service; (ii) the
desired term of the Service; (iii) the specific city pairs; (iv) the applicable
bandwidth; (v) whether Customer or Williams will be obtaining Third Party Local
Access Services; and (vi) any other information necessary for Williams to
provide the Service. Williams will make reasonable efforts to meet Customer's
Requested Start Date. In the event that Williams is unable to meet Customer's
Requested Start Date, Williams will notify Customer of the date when Williams
believes the Service will be available and Customer's Requested Start Date will
be changed to reflect the number of days of delay or advance, as appropriate.

IMPLEMENTATION INTERVALS. Williams' standard service implementation intervals
for each of the Services provided by Williams on its own network are set forth
individually for each Service in the respective Service Schedules attached to
the Customer's Agreement. A Service Order is deemed accepted by Williams when
Williams' Service Delivery department transmits an electronic Order Confirmation
Document ("OCD") to Customer which contains a Williams' circuit identification
number. Service implementation intervals for Services provided either partially
or wholly off of Williams' owned and operated network, shall be determined on an
individual case basis and shall be subject to service-specific terms and
conditions of the of the provider of the third party services, such as the
service level parameters and related warranties, if any, pricing, surcharges,
outage credits, required commitments and termination liability. Williams shall
make reasonable efforts to provide Services within its standard service
implementation interval or on Customer's Requested Start Date. Failure of
Williams to deliver within such interval or by such Requested Start Date shall
not constitute a default under Customer's Agreement and Williams shall not be
liable to pay to Customer any penalties or damages for Williams' failure to meet
such standard service implementation intervals or Requested Start Date.

TURN UP ACKNOWLEDGEMENT. Williams will issue to Customer an electronic notice
that Service is available ("Turn Up Acknowledgement" or "TUA"). The TUA will
indicate that the relevant Service has been tested by Williams and that the
Williams' provided portion of the service meets or exceeds the Technical
Specifications set forth in the relevant Service Schedule and whether any
related third party Service is currently available. The TUA will also set forth
the date Customer's Service will be ready for use by Customer and upon which
Williams shall commence charging for the Service ("Circuit Effective Billing
Date"). Customer shall be deemed to have accepted Service and Williams shall
begin billing for the Service as of the Circuit Effective Billing Date, provided
that, if Customer notifies Williams' Service Delivery Department in writing
within three (3) business days of the Circuit Effective Billing Date that
Williams' Service is in material non-compliance with the applicable Technical
Specifications and if, upon investigation, such material non-compliance is due
solely to Williams' fault, then Williams shall correct the non-compliance and
make the appropriate adjustment to Customer's billings under the Customer's
Agreement. The occurrence of any such non-compliance shall not constitute a
default under the Customer's Agreement and Williams shall not be liable to pay
to Customer any penalties or damages resulting from any such non-compliance.
Charges for Service begin accruing upon Circuit Effective Billing Date,
regardless of whether Customer is actually using the Service, or is ready to
test and accept the Service.

                        Williams Communications                      Page 1 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                    EXHIBIT B
               SERVICE DELIVERY PROCESS AND ACCEPTABLE USE POLICY

CUSTOMER SERVICE
SERVICE DELIVERY CHARGES

NON-RECURRING AND ENHANCED SERVICE CHARGES.

The following is a list of the most common circumstances under which Williams
assesses a separate, non-recurring charge in connection with the service being
provided.

NEW ORDER INSTALLATION. Installation Charges apply when Williams provides new or
additional Interexchange Service ("IXC") or when Williams obtains new or
additional Third Party Local Access (including feature group service) on the
Customer's behalf. Williams will charge the Customer for IXC installation and
for issuing an Access Service Request ("ASR") to the Third Party Local Access
provider, i.e., Local Exchange Carrier ("LEC") or by-pass carrier, i.e.,
Competitive Access Provider ("CAP"). All Third Party Local Access provider
charges are billed to the Customer. This charge applies to both data and voice
services.

CHANGE OF SERVICE ORDER CHARGE. If Customer requests a modification to the
information contained in a Service Order (other than a Change of Service Date)
prior to completion of installation of the Service, Customer may incur a Change
of Service Order Charge. No charge will be incurred if the change is
administrative in nature (i.e. billing address, contact information, etc.). If
the change is requested prior to facilities being slotted, a Change of Service
Order, Pre-Engineering charge will apply. If the change is requested after
facilities have been slotted, a Change of Service Order, Post-Engineering charge
shall apply. A charge will be incurred if the administrative change relates to
Third Party Local Access for which Williams is acting as agent. This charge
applies to both data and voice services.

ORDER CANCELLATION CHARGE. If Customer desires to cancel a Service Order prior
to installation or acceptance of the Service, Customer will incur a Cancellation
Charge. If Customer cancels the Service Order prior to facilities being slotted,
Customer will be assessed a Pre-Engineering Cancellation Charge. If Customer
cancels the Service Order after facilities have been slotted, Customer will be
assessed a Post-Engineering Cancellation Charge. In addition to the Cancellation
Charge, Customer will be required to reimburse Williams for any cancellation
charges relating to Third Party Local Access or other third party service for
which Williams is acting as agent on behalf of Customer. This charge applies to
both data and voice services.

ASR SPECIAL ACCESS. Third Party Local Access providers supply standard service
at tariffed rates. Any local access request that the Third Party Local Access
provider defines as "special" will be subject to the ASR Special Access charges.
This charge is an administrative charge for handling the special access request.
In addition to Williams' administrative charge, Customer shall be responsible
for all charges imposed by Third Party Local Access providers in fulfilling the
request. This charge applies to both data and voice services.

ORDER EXPEDITE CHARGE. An Order Expedite Charge will apply when Customer
requests that a Service be turned-up on a date, which is earlier than Williams'
standard implementation interval. If Customer requests that a Service Order be
expedited and the expedited order fails to be installed in the standard
interval, the expedite charge will still apply. This charge applies to both data
and voice services.

CROSS CONNECT INSTALL CHARGE. Cross Connect charges shall apply to connections
between Customer Equipment, Williams facilities or network, and the equipment or
cable of third parties.

THIRD PARTY ORDER EXPEDITE CHARGES. These charges are assessed by a Third Party
Service Provider (e.g., Third Party Local Access Providers) if Customer requests
expedited services and/or changes to Service Order and Williams agrees to such
request. This charge applies to both data and voice services.

MISCELLANEOUS. Customer should be aware that from time to time, third-party
charges are levied to Williams after submission of the original Service Order
from Customer. Williams may be obligated to pass these charges to Customer.
Williams will inform Customer of any such charges before the charges are passed
to Customer. Williams cannot commit that all charges related to an order will
always be on the original Service Order. This charge applies to both data and
voice services.

                        Williams Communications                      Page 2 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                    EXHIBIT B
               SERVICE DELIVERY PROCESS AND ACCEPTABLE USE POLICY

CUSTOMER SERVICE
ACCEPTABLE USE POLICY

Acceptable Use Policy Williams Communications, LLC ("Williams") has established
this Acceptable Use Policy to advise the users of its network and services of
the acceptable and prohibited uses of its network and services. Williams'
network and services must be used only for lawful purposes and for purposes
consistent with this Acceptable Use Policy.

1. Users are prohibited from violating any system or network security measures
   including but not limited to engaging in: unauthorized access or use of
   Williams' or a third party's network, data, or information;

         o   unauthorized monitoring of Williams' or third party's data, systems
             or network traffic;

         o   interference with a third party's use of Williams' network or
             service.

2. Users are prohibited from engaging in activities that cause interference with
   a third party's ability to connect to the Internet or provide services to
   Internet users.

3. Users are prohibiting from sending unsolicited email messages. Users shall
   not: post ten (10) or more messages similar in content to Usenet or other
   newsgroups, forums, email mailing lists or other similar groups or lists;
   post any Usenet or other newsgroup, forum, email mailing list or other
   similar group or list articles which are off-topic according to the charter
   or other owner-published FAQ or description of the group or list; Send
   unsolicited email of commercial content to Internet users, or any unsolicited
   email that could reasonably be expected to provoke complaints.

4. Users are prohibited from creating, storing or disseminating any material
   containing unlawful content including materials protected by trademark, trade
   secret, copyright or other intellectual property rights without proper
   authorization, material that is libelous, slanderous, an invasion of privacy
   or otherwise illegal.

5. Users are prohibited from falsifying user information provided to Williams or
   to other users in connection with use of a Williams's service.

6. Users are prohibited from engaging in any of the foregoing activities by
   using the service of another provider, but channeling such activities through
   a Williams account, remailer, or otherwise through a Williams service or
   using a Williams account as a maildrop for responses or otherwise using the
   services of another provider for the purpose of facilitating the forgoing
   activities if such use of another party's service could reasonably be
   expected to adversely affect a Williams service.

Williams considers the above practices to constitute abuse of its service.
Engaging in one or more of these practices may result in termination of a user's
access to Williams' services. Nothing contained in this policy shall be
construed to limit Williams' actions or remedies in any way with respect to any
of the foregoing activities, and Williams reserves the right to take any and all
additional actions it may deem appropriate with respect to such activities,
including without limitation taking action to recover the costs and expenses of
identifying offenders and removing them from the Williams service, and levying
cancellation charges to cover Williams' costs. Williams will investigate
violations of policy and will cooperate with law enforcement officials for
suspected criminal violations. In addition, Williams's reserves at all times all
rights and remedies available to it with respect to such activities at law or in
equity.

                        Williams Communications                      Page 3 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 1
                              PRIVATE LINE SERVICE

         This Service Schedule is subject to that Master Services Agreement No.
________________ ("Agreement") by and between Williams Communications, LLC
("Williams"), and Customer.

                        SECTION 1. PRIVATE LINE SERVICES

1.1  SERVICE DESCRIPTION. Williams' Private Line Service ("Private Line
     Service") provides domestic DS-1, DS-3 and Optical SONET (OC-N) circuits
     which are specifically dedicated to Customer's use between two (2) points
     specified by the parties in a Service Order and meeting the technical
     requirements as defined below in Section 5, Technical Specifications for
     Private Line Service. In addition, Private Line Service includes only those
     circuits where the entire circuit shall be located solely upon the
     Williams' owned and operated network and both end points of such circuit
     shall originate or terminate at a Williams point of presence.

                     SECTION 2. RECURRING RATES AND CHARGES

2.1  MONTHLY RECURRING RATES.

         Interexchange Rates. Interexchange rates for Private Line Services
         wholly on Williams' owned and operated network are as set forth in
         Table A.1. Pricing in Table A.1 will apply for any Service, unless the
         parties agree to different rates, which will be determined on an
         individual case basis ("ICB"). In any event the applicable rates will
         be set forth on Customer's Service Order.

<Table>
<Caption>
                ----------------------------------------------------
                TABLE A.1.      MONTHLY RECURRING RATES
                ----------------------------------------------------
                 TERM     DS1     DS3    OC3      OC12     OC-48
                ----------------------------------------------------
                <S>     <C>     <C>     <C>      <C>      <C>
                1 year  $[***]  $[***]  $[***]   $[***]   $[***]
                ----------------------------------------------------
                            RATES ARE PER VGE V&H MILE
                ----------------------------------------------------
</Table>

2.2  MINIMUM MONTHLY RECURRING CHARGE. Notwithstanding the foregoing, the
     minimum monthly recurring charge for any Interexchange circuit ordered by
     Customer will be priced in accordance with Table A.2 below.

<Table>
<Caption>
 ----------------------------------------------------------------------------------------
 TABLE A.2                                DS-1      DS-3     OC-3     OC-12      OC-48
 ----------------------------------------------------------------------------------------
 <S>                                     <C>       <C>       <C>      <C>       <C>
 Minimum Monthly Recurring Charge        $[***]    $[***]    $[***]   $[***]    $[***]
 ----------------------------------------------------------------------------------------
</Table>

2.3  THIRD PARTY LOCAL ACCESS RATES. If a Customer requests a Letter of Agency
     ("LOA") for a DS1 Private Line circuit, Williams will issue LOA/CFA
     (Carrier Facilities Assignment) from the ILEC Central Office, which serves
     Williams' facilities. The Customer will then be responsible for a monthly
     recurring Local Service Arrangement ("LSA") charge for the channel
     termination and any applicable mileage between the ILEC Central Office and
     Williams' facilities. The LSA only applies to DS1 Private Line circuits and
     is set forth in Table A.3. For DS-3 through OC-48 Private Line circuits, or
     for any Private Line circuits not entirely located on Williams' owned and
     operated network, an entrance facility charge plus any applicable mileage
     charges will be assessed at standard tariff rates if Williams issues CFA.

<Table>
<Caption>
               ----------------------------------------------------
               TABLE A.3                                   DS-1
               ----------------------------------------------------
               <S>                                        <C>
               Monthly Recurring LSA Charge               $[***]
               ----------------------------------------------------
               Non-Recurring LSA Installation Charge      $[***]
               ----------------------------------------------------
</Table>

2.4  3:1 MUX. 3:1 Muxing allows Customer to aggregate multiple DS-1's in a
     single Williams's POP for transport and termination on a single DS-3 to
     another Williams POP. For example, Customer orders five (5) DS1's from POP
     A to POP B. Williams will mux the DS1's in POP A for transport on a single
     DS3 at the price listed in Table A.4 and terminate a DS3 to Customer at POP
     B. Williams will not demux the DS1's at the POP B location.

<Table>
<Caption>
               ----------------------------------------------------
               TABLE A.4                                   DS-3
               ----------------------------------------------------
               <S>                                        <C>
               Monthly Recurring 3:1 Mux Charge           $[***]
               ----------------------------------------------------
</Table>

----------
*** Certain information on this page has been omitted and filed separately with
    the Commission.  Confidential treatment has been requested with respect to
    the omitted portions.

                        Williams Communications                      Page 1 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>
                                   Schedule 1
                              Private Line Service

                   SECTION 3. NON-RECURRING RATES AND CHARGES

3.1  NON-RECURRING CHARGES. Non-Recurring Charges may be incurred for Private
     Line connections. Non-Recurring Charges are set forth in Table A.5 below.

<Table>
<Caption>
         --------------------------------------------------------------------------------------------------------
         TABLE A.5               NON-RECURRING CHARGES      DS-1        DS-3         OC-3       OC-12    OC-48
         --------------------------------------------------------------------------------------------------------
         <S>                                               <C>         <C>         <C>         <C>       <C>
         New Order Installation                            $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Change Of Service Date Charge (1st change free)   $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Change Of Service Order Charge
         --------------------------------------------------------------------------------------------------------
              Pre-engineering                              $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
              Post-engineering                             $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Order Cancellation
         --------------------------------------------------------------------------------------------------------
              Pre-engineering                              $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
              Post-engineering                             $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Reconfiguration Charge                            $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Access Service Request (ASR)                      $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Access Service Request (ASR) Change               $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Order Expedite                                    $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
         Cross Connect Install Charge                      $[***]      $[***]      $[***]      $[***]    $[***]
         --------------------------------------------------------------------------------------------------------
</Table>

         In addition to the above charges, Customer is required to reimburse
         Williams for any Third Party Provider charges relating to Customer's
         service. Non-Recurring Charges not described above will be considered
         special requests and will be handled on an individual case basis. All
         of the charges stated above are subject to change with thirty (30)
         calendar day's notice. See Exhibit B for a complete description of the
         above charges

3.2  INSTALLATION CHARGES. For Williams Services, installation charges shall be
     [***]***Certain information on this page has been omitted and filed
     separately with the Commission. Confidential treatment has been requested
     with respect to the omitted portions..

3.3  MISCELLANEOUS. Customer should be aware that from time to time, third-party
     charges are levied to Williams after submission of the original Service
     Order from Customer. Williams may be obligated to pass these charges to
     Customer. Williams will inform Customer of any such charges before the
     charges are passed to Customer as referenced in Section 5.3 of the
     Agreement. Williams cannot commit that all charges related to any requested
     Service will always be on the original Service Order.

3.4  NON-RECURRING PRICING. Pricing for Non-Recurring Private Line Service shall
     be as set forth in this Section 3 and are subject to change upon thirty
     (30) calendar days' written or electronic notice by Williams to Customer.
     Price changes shall only be effective on a going-forward basis and shall
     not apply to Service Orders placed by Customer and accepted by Williams
     prior to the effective date of the respective price change.

                            SECTION 4. OUTAGE CREDITS

4.1  OUTAGE CREDITS. Customer acknowledges the possibility of an unscheduled,
     continuous and/or interrupted period of time during which Private Line
     Service is unavailable or fails to conform to the Technical Specifications
     below ("Outage"). An Outage shall begin upon the earlier of Williams'
     actual knowledge of the Outage or Williams' receipt of notice from the
     Customer of the Outage. In the event of an Outage, Customer shall be
     entitled to a credit ("Outage Credit") upon Williams' receipt of Customer's
     written request for such Outage Credit. The amount of the Outage Credit for
     Private Line Service shall be an amount equal to 1/720 of the monthly
     recurring charge for the interexchange portion of the Service for each hour
     in excess of the first two (2) consecutive hours that the affected Service
     is unavailable or fails to conform to the Technical Specifications.

4.2  EXCESSIVE OUTAGES. If a single circuit experiences either (a) three (3) or
     more outages of fifteen (15) minutes duration or longer during any thirty
     (30) day period, or (b) one or more outages of fifteen (15) minutes each in
     each of three (3) consecutive months or (c) one (1) outage of more than
     twenty-four (24) consecutive hours in a one (1) calendar month period,
     ("Excessive Outage"), Customer shall be entitled, in addition to the
     applicable Outage Credit, if any, to terminate such circuits as are
     affected by the Excessive Outage without liability for the Early
     Termination Charge set forth in Section 6.4 of the Agreement. However,
     Customer shall be liable for any termination liability associated with
     Third Party Local Access Service or any other

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 2 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 1
                              PRIVATE LINE SERVICE

     Third Party Service associated with such disconnection.

     In the event Customer terminates a circuit for an Excessive Outage pursuant
     to this Section and such termination causes the Customer to fall below
     their Revenue Commitment, such terminated circuit shall count toward
     Customer's Annual Commitment as if it had not been terminated.

4.3  REMEDY. The Outage Credit and right to terminate for an Excessive Outage as
     set forth in this Section 4 shall be the sole and exclusive remedy of
     Customer in the event of any Outage and under no circumstances shall an
     Outage be deemed a default under the Agreement.

4.4  LIMITATIONS. Customer shall not receive an Outage Credit if the Outage is
     (i) of a duration of less than two (2) consecutive hours; (ii) caused by
     Customer or others authorized by Customer to use the Services under the
     Agreement; (iii) due to the failure of power, facilities, equipment,
     systems or connections not provided by Williams; (iv) caused by the failure
     of Third Party Local Access Service to Williams' fiber optic network; (v)
     the result of scheduled maintenance where Customer has been notified of
     scheduled maintenance in advance; or (vi) due to a Force Majeure event as
     defined in the Agreement.

4.5  CREDIT PAYMENT. Outage Credits shall be credited on Customer's next monthly
     invoice for the affected Service.

                       SECTION 5. TECHNICAL SPECIFICATIONS

5.1  TECHNICAL SPECIFICATIONS. Interconnection Specifications for DS-1 service
     is provided in accordance with ANSI Standard T1.102 and T1.403 (formerly
     AT&T Compatibility Bulletin 119). DS-1 Service operates at 1.544 Mbps. DS-3
     service is provided in accordance with ANSI Standard T1.102 and T1.404.
     DS-3 Service operates at 44.736 Mbps. Optical SONET Services are provided
     in accordance with ANSI Standard T1.105. OC-3 Service operates at 155.520
     Mbps and is configured with 3 separate STS-1 signaling paths. OC-3C Service
     operates at 155.520 Mbps and is configured with 1 STS-3C signaling path (or
     3 concatenated STS-1 signaling paths). OC-12 Service operates at 622.080
     Mbps with 12 separate STS-1 signaling paths. OC-12C Service operates at
     622.080 Mbps with 1 STS-12C signaling path (or 4 separate STS-3C signaling
     paths). OC-48 Service operates at 2488.320 Mbps and is configured with 48
     separate STS-1 signaling paths. The standards by which Williams' Private
     Line Services is measured apply on a one-way basis between Williams' POPs
     only.

5.2  NETWORK AVAILABILITY. Network Availability is a measurement of the percent
     of total time that service is operative when measured over a 365
     consecutive day (8760 hour) period. DS1, DS-3 and Optical SONET Service is
     considered inoperative when there has been a loss of signal or when two
     consecutive 15 second loop-back tests confirm the observation of a bit
     error rate equal to or worse than 1 x 10-6. For DS-N level Services on
     Williams' network, availability shall be 99.95% from POP to POP measured
     over a one-year period. For OC-N level Services on Williams' network,
     availability shall be 99.95% from POP to POP measured over a one-year
     period. Network availability for Services of a Third Party Provider is
     established by the Third Party Provider. The local access availability
     standards for DS-1 and DS-3 and Optical SONET Services are established by
     the Third Party Local Access Service provider.

5.3  MEAN TIME TO RESTORE. Mean Time to Restore (MTTR) shall be the average time
     required to restore service and resume availability and is stated in terms
     of equipment and cable outages. The time is measured from the moment the
     outage is reported until the service is available. With respect to Private
     Line Service, Williams has an objective of repairing network equipment
     within an average of two (2) hours and an objective to have the first fiber
     on a cable cut restored within an average of six (6) hours. Williams will
     undertake repair efforts on equipment or fiber when Williams first becomes
     aware of the problem, or when notified by Customer and Customer has
     released all or part of the Service for testing. The maintenance standards
     in this Section 5.3 only apply for equipment or fiber on Williams' owned
     and operated network and from Williams' POP to Williams' POP.

5.4  ERROR FREE SECONDS. Performance is noted in Error Free Seconds (Error Free
     Seconds ("EFS"), while Available) which is a measure of the percentage of
     total seconds that do not contain bit errors over a consecutive twenty-four
     (24) hour period. Performance shall be measured on a one-way basis using a
     Pseudo Random Bit Sequence test pattern as defined in CCITT Recommendation
     0.151. For Services on Williams' network, EFS shall be 99.5% from POP to
     POP measured over a one-year

     period. For Services not on Williams' network, the EFS standards for local
     access DS1, DS-3 and Optical SONET Service is

                        Williams Communications                      Page 3 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 1
                              PRIVATE LINE SERVICE

     established by the Third Party Local Access Service provider. For Services
     from a Third Party Provider, the Third Party Provider will establish EFS.

                          SECTION 6. PRODUCT INTERVALS

6.1  IMPLEMENTATION INTERVALS. Williams' standard service implementation
     interval for DSN and OCN Service is set forth below in Table A.6. Third
     Party Provider Service implementation intervals shall be determined on an
     individual case basis. Williams shall make reasonable efforts to provide
     Williams' Services within its standard service implementation interval.
     Failure of Williams to deliver by such date shall not constitute a default
     under the Agreement and Williams shall not be liable to pay to Customer any
     penalties or damages for Williams' failure to meet such standard service
     implementation intervals, except as set forth in Section 3.4 of the
     Agreement.

<Table>
<Caption>
                 ----------------------------------------------
                 TABLE A.6 IMPLEMENTATION INTERVALS
                 ---------------------- -----------------------
                                          STANDARD INTERVAL
                     SERVICE TYPE             POP TO POP
                 ---------------------- -----------------------
                      <S>                <C>
                      DS1                [***] calendar days
                 ---------------------- -----------------------
                      DS3                [***] calendar days
                 ---------------------- -----------------------
                      OC3                [***] calendar days
                 ---------------------- -----------------------
                      OC12               [***] calendar days
                 ---------------------- -----------------------
                      OC48               [***] calendar days
                 ---------------------- -----------------------

</Table>

                 SECTION 7. PLANNED NETWORK MAINTENANCE ACTIVITY

7.1  TIMING. Williams shall avoid performing network maintenance between 0600 to
     2200 Central Time (or local time with respect to facilities comprising
     international Service), Monday through Friday, inclusive, that will have a
     disruptive impact on the continuity or performance level of Customer's
     Service. However, the preceding sentence does not apply to restoration of
     continuity to a severed or partially severed fiber optic cable, restoration
     of dysfunctional power and ancillary support equipment, or correction of
     any potential jeopardy conditions. Williams will use commercially
     reasonable efforts to notify Customer prior to emergency maintenance.

7.2  NOTICE. Williams shall provide Customer with electronic mail, telephone,
     facsimile, or written notice of all non-emergency, planned network
     maintenance (i) not less than [***] business days prior to performing
     maintenance that, in its reasonable opinion, has a substantial likelihood
     of affecting Customer's traffic for up to fifty (50) milliseconds, and (ii)
     not less than [***] business days prior to performing maintenance that, in
     its reasonable opinion, has a substantial likelihood of affecting Customer
     traffic for more than fifty (50) milliseconds. If Williams' planned
     activity is canceled or delayed, Williams shall promptly notify Customer
     and shall comply with the provisions of this Section to reschedule any
     delayed activity.

                               SECTION 8. WARRANTY

Williams warrants that Private Line Service shall be provided to Customer in
accordance with the applicable Technical Specifications set forth above.
Williams shall use commercially reasonable efforts under the circumstances to
remedy any delays, interruptions, omissions, mistakes, accidents or errors in
the Service and restore such Service to comply with the terms hereof. THE
FOREGOING WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY AND IS PROVIDED IN LIEU OF
ALL OTHER WARRANTIES WHETHER EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE
IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
OUTAGE CREDITS REMEDY AND RIGHT TO TERMINATE FOR EXCESSIVE OUTAGES PROVIDED TO
CUSTOMER AS SET FORTH IN SECTION 4 OF THIS SERVICE SCHEDULE ARE THE SOLE AND
EXCLUSIVE REMEDIES PROVIDED TO CUSTOMER AND IS IN LIEU OF ALL OTHER REMEDIES,
REGARDLESS OF WHETHER THIS WARRANTY FAILS OF ITS ESSENTIAL PURPOSE.

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 4 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 1
                              PRIVATE LINE SERVICE

IN WITNESS WHEREOF, THE PARTIES HAVE INDICATED THEIR AGREEMENT BY SIGNING BELOW.

  UNIVERSAL ACCESS, INC.:                WILLIAMS COMMUNICATIONS, LLC:

  /s/ Robert E. Rainone                  /s/ Howard Janzen
  --------------------------------       ---------------------------------------
  Signature of Authorized                Signature of Authorized
  Representative                         Representative
  Robert E. Rainone                      Howard Janzen
  --------------------------------       ---------------------------------------
  Printed Name                           Printed Name
  President, Global Operations           President and Chief Executive Officer
  --------------------------------       ---------------------------------------
  Title                                  Title
  10/03/01                               10/03/01
  --------------------------------       ---------------------------------------
  Date                                   Date

                        Williams Communications                      Page 5 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 2
                              OPTICAL WAVE SERVICE

         This Service Schedule is subject to that Master Services Agreement No.
________________ ("Agreement") by and between Williams Communications, LLC
("Williams"), and Customer.

                        SECTION 1. OPTICAL WAVE SERVICES

1.1  OPTICAL WAVE SERVICE DESCRIPTION. Williams' Optical Wave Service provides
     unprotected, concatenated OC-48 wavelengths ("Optical Wave Service").
     Williams uses dense wavelength division multiplexing ("DWDM") technology to
     multiplex OC-48 signals at unique wavelengths, or waves, and then transmits
     the composite signal over a single fiber. At the receiver, the composite
     signal is then de-multiplexed and each unique signal is recovered. The
     Optical Wave Service provided hereunder will originate at the fiber cross
     connect in the Williams' POP designated by Customer as the origination
     point and will terminate at the fiber cross connect in the Williams' POP
     designated by Customer as the termination point with all such Optical Wave
     Service to be provided on circuits located entirely upon the Williams'
     owned and operated network and both end points of such circuit shall
     originate or terminate at a Williams point of presence. Williams' Optical
     Wave Service does not include a timing source. When a Customer purchases
     Optical Wave Service from Williams, the Customer will be expected to
     provide a clocking source for its equipment.

                      SECTION 2. RECURRING RATES & CHARGES

2.1  MONTHLY RECURRING RATES.

     OPTICAL WAVE SERVICE RATES. Rates for Optical Wave Service wholly on
     Williams' owned and operated network are as set forth in Table B.1 below.
     Pricing in Table B.1 will apply for any Service, unless the parties agree
     to different rates, which will be determined on an individual case basis
     ("ICB"). In any event the applicable rates will be set forth on Customer's
     Service Order.

<Table>
<Caption>
                  ------------------------------------------
                  TABLE B.1 MONTHLY RECURRING RATES
                  ------------------------------------------
                           TERM               OC-48
                  ------------------------------------------
                           <S>                 <C>
                           1 year              [***]
                  ------------------------------------------
                         RATES ARE PER VGE V&H MILE
                  ------------------------------------------
</Table>

2.2  DIVERSE ROUTING CHARGES. A diverse route is defined as an indirect route
     between two cities. Customer may order a diverse route between two city
     pairs For example, a Customer's initial request for Optical Wave Service
     from City A to City B will be provided and priced using the shortest route
     and V&H miles. When Customer requests a diverse route from City A to City B
     through City C, the route will be priced using V&H miles from City A to
     City C and City C to City B separately. These prices will then be added
     giving the total monthly recurring charge for the diverse route from City A
     to City B.

2.3  MINIMUM MONTHLY RECURRING CHARGE.. Notwithstanding the foregoing, the
     minimum monthly recurring charge for any Interexchange circuit ordered by
     Customer will be priced in accordance with Table B.2 below.

<Table>
<Caption>
                  ----------------------------------------------------
                  TABLE B.2                                     OC-48
                  ----------------------------------------------------
                  <S>                                          <C>
                  Minimum Monthly Recurring Charge             $[***]
                  ----------------------------------------------------
</Table>

                    SECTION 3. NON-RECURRING RATES & CHARGES

3.1  NON-RECURRING  CHARGES.  Non-Recurring  Charges may be incurred for Optical
     Wave  Services and are set forth below in Table B.3.

<Table>
<Caption>
              ----------------------------------------------------------------------
                   TABLE B.3        NON-RECURRING CHARGES              OC48
              ----------------------------------------------------------------------
              <S>                                                     <C>
              New Order Installation                                  $[***]
              ----------------------------------------------------------------------
              Change Of Service Date Charge (1st change free)         $[***]
              ----------------------------------------------------------------------
              Change of Service Order Charge
              ----------------------------------------------------------------------
                   Pre-engineering                                    $[***]
              ----------------------------------------------------------------------
                   Post-engineering                                   $[***]
              ----------------------------------------------------------------------
</Table>

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 3 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 2
                              OPTICAL WAVE SERVICE

<Table>

          ------------------------------------------------------------
          Order Cancellation
          ------------------------------------------------------------
          <S>                                               <C>
               Pre-engineering                              %[***]
          ------------------------------------------------------------
                   TABLE B.3        NON-RECURRING CHARGES    OC48
          ------------------------------------------------------------
               Post-engineering                             $[***]
          ------------------------------------------------------------
          Reconfiguration                                   $[***]
          ------------------------------------------------------------
          Order Expedite                                    $[***]
          ------------------------------------------------------------
</Table>
          ALL NON-RECURRING CHARGES FOR WAVES ARE FIGURED
          SEPARATELY FOR EACH DIVERSE ROUTE.
          ------------------------------------------------------------
          In addition to the above charges, Customer is required to
          reimburse Williams for any Third Party Provider charges
          relating to Customer's service. Non-Recurring Charges not
          described above will be considered special requests and will
          be handled on an individual case basis. All of the charges
          stated above are subject to change with thirty (30) calendar
          day's notice. See Exhibit B for a complete description of the
          above charges.
          ------------------------------------------------------------

3.2  INSTALLATION CHARGES. For Williams Services, installation charges shall be
     waived by Williams at the time of order for a OC-48 Wave Service where the
     mileage is greater than 500 miles. Should the individual OC-48 Wave Service
     be canceled prior to the twelve (12) month anniversary of its installation,
     Williams will back bill Customer the full installation amount for that
     Service.

3.3  HYBRID  CIRCUIT  CHARGES.  For  circuits  containing  both Optical Wave
     Service and Private  Line  Service,  pricing  shall be calculated using the
     following process:

     a.  A circuit shall be divided into segments by Service. Each circuit
         segment shall be delineated by the longest span of that Service
         possible.

     b.  Circuit pricing will be by segment as identified above. Pricing shall
         be based on the V&H coordinates of each segment's endpoints.
         Installation pricing shall be on a per segment basis. Other
         Non-Recurring Charges shall be on a per circuit basis.

3.4  NON-RECURRING PRICING. Pricing for Non-Recurring Optical Wave Service shall
     be as set forth in this Section 3 and are subject to change upon thirty
     (30) calendar days' written or electronic notice by Williams to Customer.
     Price changes shall only be effective on a going-forward basis and shall
     not apply to Service Orders placed by Customer and accepted by Williams
     prior to the effective date of the respective price change.

                            SECTION 4. OUTAGE CREDITS

4.1  OUTAGE CREDITS. Customer acknowledges the possibility of an unscheduled,
     continuous and/or interrupted period of time during which Optical Wave
     Service is unavailable or fails to conform to the Technical Specifications
     below ("Outage"). An Outage shall begin upon the earlier of Williams'
     actual knowledge of the Outage or Williams' receipt of notice from the
     Customer of the Outage. In the event of an Outage, Customer shall be
     entitled to a credit ("Outage Credit") upon Williams' receipt of Customer's
     written request for such Outage Credit. The amount of the Outage Credit for
     Optical Wave Service shall be an amount equal to 1/1440 of the monthly
     recurring charge for the interexchange portion of the Service for each hour
     in excess of the first two (2) consecutive hours that the affected Service
     is unavailable or fails to conform to the below Technical Specifications.

4.2  REMEDY. The Outage Credit as set forth in this Section 4 shall be the sole
     and exclusive remedy of Customer in the event of any Outage and under no
     circumstances shall an Outage be deemed a default under the Agreement

4.3  LIMITATIONS. Customer shall not receive an Outage Credit if the Outage is:
     (i) of a duration of less than two (2) consecutive hours; (ii) caused by
     Customer or others authorized by Customer to use the Services under the
     Agreement; (iii) due to the failure of power, facilities, equipment,
     systems or connections not provided by Williams; (iv) caused by the failure
     of Third Party Local Access Service to Williams' fiber optic network; (v)
     the result of scheduled maintenance where Customer has been notified of
     scheduled maintenance in advance; or (vi) due to a Force Majeure event as
     defined in the Agreement.

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 4 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 2
                              OPTICAL WAVE SERVICE

4.4  CREDIT PAYMENT.  Outage Credits shall be credited on Customer's next
     monthly invoice for the affected Service.

                       SECTION 5. TECHNICAL SPECIFICATIONS

5.1  TECHNICAL SPECIFICATIONS. At any time during the term of the Agreement,
     Williams shall have the capability to monitor and report performance
     monitoring functions and alarm/status monitoring functions listed as
     required in the Telcordia GR-253-CORE SONET Transport Systems Common
     Generic Criteria (Dec. 1997) for Optical Wave Service. The standards by
     which Williams' Optical Wave Service is measured apply on a one-way basis
     between Williams' POPs only.

5.2  NETWORK AVAILABILITY. Network Availability is a measurement of the percent
     of total time that Service is operative when measured over a 365
     consecutive day (8760 hour) period. For Services on Williams' network,
     Network Availability shall be 99.339% measured over a one thousand (1,000)
     mile Service for a one-year period. Performance (% Error Free Seconds
     ("EFS"), while available) is noted in EFS, which is a measure of the
     percentage of total seconds that do not contain bit errors when measured
     over a period of thirty (30) consecutive days. For Services on Williams'
     network, EFS shall be 99.076% from POP to POP measured over a one (1) year
     period. Network Availability will vary with different circuit lengths.

5.3  MAINTENANCE. The following maintenance procedures and activities are to be
     provided by Williams for Optical Wave Service. Williams will promptly
     perform transport capacity maintenance activities for Optical Wave Service
     including isolating troubles and will provide information concerning those
     troubles, for each Optical Wave Service, to the Customer's Trouble
     Reporting Center.

     a.  REMOTE ALARM SURVEILLANCE. Throughout the term of the Agreement,
         Williams will provide remote alarm surveillance and sectionalization
         equipment and procedures for the purpose of detecting any
         out-of-service conditions or Service-affecting conditions, and for
         rapidly removing Service impairments and restoring Service for Optical
         Wave Service.

     b.  NOTIFICATION. In the event of any service-affecting alarm condition on
         Optical Wave Service, Williams will notify the applicable Customer
         Trouble Reporting Center. Such notice will include (i) the type and
         status of alarm-causing condition, (ii) the estimated time to repair,
         (iii) and the probable cause of failure. Williams will report, the
         status of repair work and a revised estimate of the time to complete
         the repair.

5.4  MEAN TIME TO RESTORE. Mean Time to Restore (MTTR) shall be the average time
     required to restore service and resume availability and is stated in terms
     of cable outages. The time is measured from the moment the outage is
     reported until the service is available. With respect to Optical Wave
     Service, Williams has an objective to have the first fiber on a cable cut
     restored within an average of six (6) hours. Williams will undertake repair
     efforts on equipment or fiber when Williams first becomes aware of the
     problem, or when notified by Customer and Customer has released all or part
     of the Service for testing. The maintenance standards in this Section 5.4
     only apply for equipment or fiber on Williams' owned and operated network
     and from Williams' POP to Williams' POP.

                          SECTION 6. PRODUCT INTERVALS

6.1  IMPLEMENTATION INTERVALS. Williams' standard service implementation
     interval for DSN and OCN service is set forth below in Table B.4. Third
     Party Service implementation intervals shall be determined on an individual
     case basis. Williams shall make reasonable efforts to provide Williams'
     Services within its standard service implementation interval. Failure of
     Williams to deliver by such date shall not constitute a default under the
     Agreement, and Williams shall not be liable to pay to Customer any
     penalties or damages for Williams' failure to meet such standard service
     implementation intervals, except as set forth in Section 3.4 of the
     Agreement.

<Table>
<Caption>
                ------------------------------------------------------
                TABLE B.4 IMPLEMENTATION INTERVALS
                ------------------------------------------------------
                                                STANDARD INTERVAL
                       SERVICE TYPE                POP TO POP
                ------------------------------------------------------
                    <S>                      <C>
                     OC48 Waves              [***] Calendar days
                ------------------------------------------------------
                    OC192 Waves                        ICB
                ------------------------------------------------------
</Table>

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 5 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 2
                              OPTICAL WAVE SERVICE

                 SECTION 7. PLANNED NETWORK MAINTENANCE ACTIVITY

7.1  TIMING. Williams shall avoid performing network maintenance between 0600 to
     2200 Central Time (or local time with respect to facilities comprising
     international Service), Monday through Friday, inclusive, that will have a
     disruptive impact on the continuity or performance level of Customer's
     Service. However, the preceding sentence does not apply to restoration of
     continuity to a severed or partially severed fiber optic cable, restoration
     of dysfunctional power and ancillary support equipment, or correction of
     any potential jeopardy conditions. Williams will use commercially
     reasonable efforts to notify Customer prior to emergency maintenance.

7.2  NOTICE. Williams shall provide Customer with electronic mail, telephone,
     facsimile, or written notice of all non-emergency, planned network
     maintenance (i) not less than [***][*** Certain information on this page
     has been omitted and filed separately with the Commission treatment has
     been requested with respect to the omitted portions.] business days prior
     to performing maintenance that, in its reasonable opinion, has a
     substantial likelihood of affecting Customer's traffic for up to fifty (50)
     milliseconds, and (ii) not less than [***] business days prior to
     performing maintenance that, in its reasonable opinion, has a substantial
     likelihood of affecting Customer traffic for more than fifty (50)
     milliseconds. If Williams' planned activity is canceled or delayed,
     Williams shall promptly notify Customer and shall comply with the
     provisions of this Section to reschedule any delayed activity.

                               SECTION 8. WARRANTY

Williams warrants that Optical Wave Service shall be provided to Customer in
accordance with the applicable Technical Specifications set forth above.
Williams shall use commercially reasonable efforts under the circumstances to
remedy any delays, interruptions, omissions, mistakes, accidents or errors in
the Services and restore such Services to comply with the terms hereof. THE
FOREGOING WARRANTY IS THE SOLE AND EXCLUSIVE WARRANTY AND IS PROVIDED IN LIEU OF
ALL OTHER WARRANTIES WHETHER EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE
IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
OUTAGE CREDITS REMEDY AND RIGHT TO TERMINATE FOR EXCESSIVE OUTAGES PROVIDED TO
CUSTOMER AS SET FORTH IN SECTION 4 OF THIS SERVICE SCHEDULE ARE THE SOLE AND
EXCLUSIVE REMEDIES PROVIDED TO CUSTOMER AND IS IN LIEU OF ALL OTHER REMEDIES,
REGARDLESS OF WHETHER THIS WARRANTY FAILS OF ITS ESSENTIAL PURPOSE.

[Remainder of page left intentionally blank]

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 4 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 2
                              OPTICAL WAVE SERVICE

IN WITNESS WHEREOF, THE PARTIES HAVE INDICATED THEIR AGREEMENT BY SIGNING BELOW.

    UNIVERSAL ACCESS, INC.:             WILLIAMS COMMUNICATIONS, LLC:

    /s/ Robert E. Rainone               /s/ Howard Janzen
    ---------------------------------   ----------------------------------------
    Signature of Authorized             Signature of Authorized
    Representative                      Representative
    Robert E. Rainone                   Howard Janzen
    ---------------------------------   ----------------------------------------
    Printed Name                        Printed Name
    President, Global Operations        President and Chief Executive Officer
    ---------------------------------   ----------------------------------------
    Title                               Title
    10/03/01                            10/03/01
    ---------------------------------   ----------------------------------------
    Date                                Date

                        Williams Communications                      Page 5 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 3
                                   ATM SERVICE

         This Service Schedule is subject to that Master Services Agreement No.
________________ ("Agreement") by and between Williams Communications, LLC
("Williams"), and Customer.

                        SECTION 1. DESCRIPTION OF SERVICE

1.1  SERVICE DESCRIPTION. Williams Network Asynchronous Transfer Mode Service
     (the "ATM Service") is cell-based switching and multiplexing technology,
     which can support applications requiring high bandwidth and high
     performance. ATM Service will allow Customers who have requirements for
     high speed, inter-premise connectivity to interconnect their multiple
     locations via a User Network Interface (UNI) element from the Customer
     premise equipment (CPE) to the Williams' point of presence (POP). ATM
     Service is a general-purpose, connection-oriented technology that provides
     integration of disparate networks onto a single communications
     infrastructure. ATM Service provides the capability to route traffic
     between various end points via virtual circuits that are predefined on the
     Williams' ATM network and in the equipment provided by the Customer (CPE).
     The Customer is responsible for segmenting information into 53 byte cells
     for transport across the Williams' ATM network. ATM Service provides
     networking capabilities suited for high-speed, low delay, bandwidth
     intensive applications such as voice, video and data that require real-time
     or near real-time connectivity between multiple locations. In addition, ATM
     Service shall only be provided with respect to those circuits where the
     entire circuit shall be located entirely upon the Williams' owned and
     operated network and both end points of such circuit shall originate or
     terminate at a Williams' point of presence.

                     SECTION 2. RECURRING RATES AND CHARGES

2.1  UNI PORT CONNECTIONS. Rates for User Network Interface (UNI) Port
     Connections is determined on the port speed connections selected by
     Customer. UNI Port Connections are currently available at DS3, OC3 and OC12
     speeds. Monthly recurring charges for Port Connections are set forth in
     Table C.1 below.

<Table>
<Caption>

                  ---------------------------------------------------
                  TABLE C.1         MONTHLY RECURRING PORT CHARGE
                  ---------------------------------------------------
                     DS3                  OC3             OC12
                  ---------------------------------------------------
                  <S>                    <C>              <C>
                  $[***]***              $[***]           $[***]
                  ---------------------------------------------------
                                 VBRNRT, CBR AND UBR
                  ---------------------------------------------------
</Table>

2.2  VIRTUAL CIRCUITS. There are two types of virtual circuits, which can be
     selected, the Virtual Channel Connection (VCC) or the Virtual Path
     Connection (VPC). The type of virtual circuit selected by the Customer does
     not determine the price. Pricing for virtual circuits is determined based
     on the Class of Service (CoS). Three Classes of Service are offered by
     Williams: Constant Bit Rate (CBR) and Variable Bit Ratenon real time
     (VBRnrt) and Unspecified Bit Rate (UBR). CoS charges are stated in
     Committed Information Rates (CIR) which are stated in Megabit per second
     (Mbps) increments for one-way (Simplex) VCCs or VPCs. CIR increments are
     available in 1 Mbps increments up to 40 Mbps for DS3 ports, 5 Mbps
     increments up to 150 Mpbs for OC3 ports and 25 Mbps increments up to 600
     Mbps for OC12 ports. Monthly recurring charges for Bandwidth are set forth
     below in Table C.2.

<Table>
<Caption>
     ---------------------------------------------------------------------------------------
     TABLE C.2                            MONTHLY RECURRING BANDWIDTH CHARGES
     ---------------------------------------------------------------------------------------
                                    PRICE PER               PRICE                 PRICE
       PORT       CIR                  VCC                   PER                   PER
       SPEED     (MBPS)     COS                      COS     MBPS          COS     MBPS
     ---------------------------------------------------------------------------------------
     <S>        <C>        <C>      <C>             <C>      <C>           <C>     <C>
     DS3        1-9         UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                10-19       UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                20-29       UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                30-40       UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
     OC3        1-20        UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                21-35       UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                36-55       UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                56-75       UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                76-95       UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                96-120      UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
                121-150     UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
     ---------------------------------------------------------------------------------------
</Table>

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 1 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 3
                                   ATM SERVICE

<Table>
<Caption>
             ---------------------------------------------------------------------------------------
             TABLE C.2                            MONTHLY RECURRING BANDWIDTH CHARGES
             ---------------------------------------------------------------------------------------
                                            PRICE PER                PRICE                 PRICE
               PORT      CIR                    VCC                   PER                   PER
               SPEED    (MBPS)     COS                      COS       MBPS         COS     MBPS
             ---------------------------------------------------------------------------------------
             <S>        <C>         <C>     <C>             <C>       <C>           <C>    <C>
             OC12       1-75        UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
             ---------------------------------------------------------------------------------------
                        76-175      UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
             ---------------------------------------------------------------------------------------
                        176-275     UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
             ---------------------------------------------------------------------------------------
                        276-350     UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
             ---------------------------------------------------------------------------------------
                        351-475     UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
             ---------------------------------------------------------------------------------------
                        476-600     UBR     $[***]          VBRnrt   $[***]         CBR    $[***]
             ---------------------------------------------------------------------------------------
</Table>

2.3  ATM FLEX-UNI. ATM Flex-UNI allows Customers, expecting to outgrow their
     initial physical port size within the first twelve (12) months of their
     Service, a migration path to larger Permanent Virtual Circuits (PVCs)
     without requiring an upgrade of their hardware.

     a.  OC3 ORDERING INCREMENTS. Customer can order PVCs in one-megabyte
         increments starting with one (1) megabytes up to nineteen (19)
         megabytes for an OC3 physical port. Once Customer needs a twenty (20)
         megabyte PVC, Customer must revert to the standard OC3 port pricing
         regardless of the time remaining on the twelve (12) month period.

     b.  OC12 ORDERING INCREMENTS. Customer can order PVCs in five-megabyte
         increments starting with five (5) megabytes up to seventy (70)
         megabytes for an OC12 physical port. Once Customer needs a 75-megabyte
         PVC, Customer must revert to the standard OC12 port pricing regardless
         of the time remaining on the twelve (12) month period.

     c.  ATM FLEX UNI TERM COMMITMENT. Before ATM Flex-UNI Service will be
         allowed, Customer must collocate with Williams' POP and commit to a
         three (3) year term for the Service. Customer will receive the reduced
         ATM Flex-UNI rate for the first twelve (12) months of the circuit.
         Customer will be charged Williams' standard ATM rate for the port, (i)
         if Customer exceeds the ATM Flex-UNI capacity during the first twelve
         (12) months of Service; or (ii) beginning the 13th month of the
         circuit, whichever is sooner.

     d.  MONTHLY RECURRING CHARGES. ATM Flex-UNI pricing is based on flat
         monthly fee assessed per node, which includes a flat port charge based
         on the port connection speed, a charge for each PVC's CIR going out
         from the port, and local access. ATM Flex-UNI is priced simplex,
         meaning that a PVC's CIR is priced for both the ingress and egress CIR.
         Monthly recurring charges for ATM Flex-UNI pricing is set forth below
         in Table C.3.

<Table>
<Caption>
                      ---------------------------------------------------------
                      TABLE C.3               MONTHLY RECURRING PORT CHARGE
                      ---------------------------------------------------------
                                     OC3                          OC12
                      ---------------------------------------------------------
                                    <S>                          <C>
                                    $[***]                       $[***]
                      ---------------------------------------------------------
</Table>

                   SECTION 3. NON-RECURRING RATES AND CHARGES

3.1  UNI PORT AND ATM FLEX-UNI CONNECTIONS. Non-recurring charges may be
     incurred for the Port, VCC or VPC connections. Non-recurring Charges are
     set forth below in Table C.4.

<Table>
<Caption>
         ----------------------------------------------------------------------------------------------------
         TABLE C.4                                 UNI PORT NON-RECURRING CHARGES
         ----------------------------------------------------------------------------------------------------
                                                        DS3                 OC3                 OC12
         ----------------------------------------------------------------------------------------------------
         New Order Installation
         ----------------------------------------------------------------------------------------------------
         <S>                                           <C>                 <C>                 <C>
         Port                                          $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
         Virtual Circuit                               $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
         Change  Of  Service  Date  Charge  (1st       $[***]              $[***]              $[***]
         change free)
         ----------------------------------------------------------------------------------------------------
         Change Of Service Order Charge
         ----------------------------------------------------------------------------------------------------
              Pre-engineering                          $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
              Post-engineering                         $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
              Port Order Change                        $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
</Table>

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 2 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 3
                                   ATM SERVICE

<Table>
         ----------------------------------------------------------------------------------------------------
         <S>                                           <C>                 <C>                 <C>
              PVC Order Change                         $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
         Order Cancellation
         ----------------------------------------------------------------------------------------------------
              Pre-engineering                          $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
              Post-engineering                         $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
         Access  Service  Request  (ASR) Special       $[***]              $[***]              $[***]
         Access
         ----------------------------------------------------------------------------------------------------
         ASR Supplement                                $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
         Order Expedite                                $[***]              $[***]              $[***]
         ----------------------------------------------------------------------------------------------------
         Cross Connect Install Charge                  $[***]              $[***]              $[***]

         ----------------------------------------------------------------------------------------------------
</Table>

         In addition to the above charges, Customer is required to reimburse
         Williams for any Third Party Provider charges relating to Customer's
         service. Non-Recurring Charges not described above will be considered
         special requests and will be handled on an individual case basis. All
         of the charges stated above are subject to change with thirty (30)
         calendar day's notice. See Exhibit B for a complete description of the
         above charges.
         -----------------------------------------------------------------------

3.2  INSTALLATION CHARGES For Williams Services, installation and non-recurring
     charges shall be [***].

3.3  MISCELLANEOUS. Customer should be aware that from time to time, third-party
     charges are levied to Williams after submission of the original Service
     Order from Customer. Williams may be obligated to pass these charges to
     Customer. Williams will inform Customer of any such charges before the
     charges are passed to Customer. Williams cannot commit that all charges
     related to any requested Service will always be on the original Service
     Order.

3.4  NON-RECURRING PRICING. Pricing for Non-Recurring ATM Service shall be as
     set forth in this Section 3 and are subject to change upon thirty (30)
     calendar days' written or electronic notice by Williams to Customer. Price
     changes shall only be effective on a going-forward basis and shall not
     apply to Service Orders placed by Customer and accepted by Williams prior
     to the effective date of the respective price change.

                            SECTION 4. OUTAGE CREDITS

4.1  OUTAGE CREDITS. Customer acknowledges the possibility of an unscheduled,
     continuous and/or interrupted period of time during which ATM Service is
     unavailable or fails to conform to the Technical Specifications below
     ("Outage"). An Outage shall begin upon the earlier of Williams' actual
     knowledge of the Outage or Williams' receipt of notice from the Customer of
     the Outage. In the event of an Outage, Customer shall be entitled to a
     credit ("Outage Credit") upon Williams' receipt of Customer's written
     request for such Outage Credit. The amount of the Outage Credit for ATM
     Service shall be an amount equal to ten percent (10%) of the monthly Port,
     PVC and/or usage charges (as stated on the applicable Service Order)
     regardless of the length of such Outage.

4.2  REMEDY. The Outage Credit as set forth in this Section 4 shall be the sole
     and exclusive remedy of Customer in the event of any Outage and under no
     circumstances shall an Outage be deemed a default under the Agreement.

4.3  LIMITATIONS. Customer shall not receive an Outage Credit if the Outage is:
     (i) of a duration of less than two (2) consecutive hours; (ii) caused by
     Customer or others authorized by Customer to use the Services under the
     Agreement; (iii) due to the failure of power, facilities, equipment,
     systems or connections not provided by Williams; (iv) caused by the failure
     of Third Party Local Access Service to Williams' fiber optic network; (v)
     the result of scheduled maintenance where Customer has been notified of
     scheduled maintenance in advance; or (vi) due to a Force Majeure event as
     defined in the Agreement.

4.4  CREDIT PAYMENT. Outage Credits shall be credited on Customer's next monthly
     invoice for the affected Service.

                       SECTION 5. TECHNICAL SPECIFICATIONS

5.1  TECHNICAL SPECIFICATIONS. The Technical Specifications set forth herein are
     stated as an objective that the ATM Service will perform in accordance with
     prevailing telecommunications industry standards. The standards by which
     Williams' ATM Service is measured apply on a one-way basis between
     Williams' POPs only and involves two variables: Network Availability and
     Mean-time-to-restore. Mean-time-to-restore is discussed in Section 5.3 of
     this Schedule.

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 3 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 3
                                   ATM SERVICE

5.2  NETWORK AVAILABILITY. Williams' Network Availability is a measurement of
     the percent of total time that service is operative when measured over a
     365 consecutive day (8760 hour) period. For ATM Services on Williams'
     network, Network Availability shall be 99.95% from point-of-presence
     ("POP") to POP measured over a one (1) year period. Network Availability
     for Services of a Third Party Provider is established by the Third Party
     Provider. The Local Access Service availability standards for ATM Services
     are established by the Local Access Service provider.

5.3  MEAN TIME TO RESTORE. Mean Time to Restore (MTTR) shall be the average time
     required to restore service and resume availability and is stated in terms
     of equipment and cable outages. The time is measured from the moment the
     outage is reported until the service is available. With respect to ATM
     Service, Williams has an objective of repairing network equipment within an
     average of two (2) hours and an objective to have the first fiber on a
     cable cut restored within an average of six (6) hours. Williams will
     undertake repair efforts on equipment or fiber when Williams first becomes
     aware of the problem, or when notified by Customer and Customer has
     released all or part of the Service for testing. The maintenance standards
     in this Section 5.3 only apply for equipment or fiber on Williams' owned
     and operated network and from Williams' POP to Williams' POP.

                          SECTION 6. PRODUCT INTERVALS

6.1  IMPLEMENTATION INTERVALS. Williams' standard service implementation
     interval for DSN and OCN service is set forth below in Table C.5. Third
     Party Service implementation intervals shall be determined on an individual
     case basis. Williams shall make reasonable efforts to provide Williams'
     Services within its standard service implementation interval. Failure of
     Williams to deliver by such date shall not constitute a default under the
     Agreement and Williams shall not be liable to pay to Customer any penalties
     or damages for Williams' failure to meet such implementation intervals.

<Table>
<Caption>
             --------------------------------------------------------------------------------------
             TABLE C.5 IMPLEMENTATION INTERVALS
             --------------------------------------------------------------------------------------
                                               STANDARD INTERVAL           STANDARD INTERVAL
                     SERVICE TYPE                 POP TO POP            POP TO POP W/THIRD PARTY
                                                                              LOCAL ACCESS
             --------------------------------------------------------------------------------------
                  <S>                          <C>                        <C>
                  DSN                          [***] calendar days        [***] calendar days
             --------------------------------------------------------------------------------------
                  OCN                          [***] calendar days        [***] calendar days
             --------------------------------------------------------------------------------------
</Table>

                 SECTION 7. PLANNED NETWORK MAINTENANCE ACTIVITY

7.1  TIMING. Williams shall avoid performing network maintenance between 0600 to
     2200 Central Time (or local time with respect to facilities comprising
     international Service), Monday through Friday, inclusive, that will have a
     disruptive impact on the continuity or performance level of Customer's
     Service. However, the preceding sentence does not apply to restoration of
     continuity to a severed or partially severed fiber optic cable, restoration
     of dysfunctional power and ancillary support equipment, or correction of
     any potential jeopardy conditions. Williams will use commercially
     reasonable efforts to notify Customer prior to emergency maintenance.

7.2  NOTICE. Williams shall provide Customer with electronic mail, telephone,
     facsimile, or written notice of all non-emergency, planned network
     maintenance (i) not less than[***] business days prior to performing
     maintenance that, in its reasonable opinion, has a substantial likelihood
     of affecting Customer's traffic for up to fifty (50) milliseconds, and (ii)
     not less than [***] business days prior to performing maintenance that, in
     its reasonable opinion, has a substantial likelihood of affecting Customer
     traffic for more than fifty (50) milliseconds. If Williams' planned
     activity is canceled or delayed, Williams shall promptly notify Customer
     and shall comply with the provisions of this Section to reschedule any
     delayed activity.

                               SECTION 8. WARRANTY

Williams warrants that ATM Service shall be provided to Customer in accordance
with the applicable Technical Specifications set forth above. Williams shall use
commercially reasonable efforts under the circumstances to remedy any delays,
interruptions, omissions, mistakes, accidents or errors in the Services and
restore such Services to comply with the terms hereof. THE FOREGOING WARRANTY IS
THE SOLE AND EXCLUSIVE WARRANTY AND IS PROVIDED IN LIEU OF ALL

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 4 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 3
                                   ATM SERVICE

OTHER WARRANTIES WHETHER EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE
IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
OUTAGE CREDITS REMEDY PROVIDED TO CUSTOMER AS SET FORTH IN SECTION 4 OF THIS
SERVICE SCHEDULE IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO CUSTOMER AND IS IN
LIEU OF ALL OTHER REMEDIES, REGARDLESS OF WHETHER THIS WARRANTY FAILS OF ITS
ESSENTIAL PURPOSE.

[Remainder of page left intentionally blank]

                        Williams Communications                      Page 5 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 3
                                   ATM SERVICE

IN WITNESS WHEREOF, THE PARTIES HAVE INDICATED THEIR AGREEMENT BY SIGNING BELOW.

    UNIVERSAL ACCESS, INC.:             WILLIAMS COMMUNICATIONS, LLC:

    /s/ Robert E. Rainone               /s/ Howard Janzen
    ---------------------------------   ----------------------------------------
    Signature of Authorized             Signature of Authorized
    Representative                      Representative
    Robert E. Rainone                   Howard Janzen
    ---------------------------------   ----------------------------------------
    Printed Name                        Printed Name
    President, Global Operations        President and Chief Executive Officer
    ---------------------------------   ----------------------------------------
    Title                               Title
    10/03/01                            10/03/01
    ---------------------------------   ----------------------------------------
    Date                                Date

                        Williams Communications                      Page 6 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 9
                         INTERNATIONAL BACKHAUL SERVICE

         This Service Schedule is subject to that Master Services Agreement No.
________________ ("Agreement") by and between Williams Communications, LLC
("Williams"), and Customer.

                   SECTION 1. INTERNATIONAL BACKHAUL SERVICES

1.1  SERVICE DESCRIPTION. Williams' International Backhaul Service
     ("International Backhaul Service") is a point-to-point transport service
     that connects a Customer's international cable network to Williams'
     domestic U.S. network. Customer may order International Backhaul Service at
     STM-1 capacity at the China U.S. Cable and Southern Cross Cable Network
     ("Southern Cross") and STM-1, STM-4 or STM-16 capacity at the Japan U.S.
     Cable and TAT-14 ("TAT-14"), subject to availability. Williams will pick up
     Customer's traffic, which enters the U.S. via a cable system at a cable
     landing station. The cable landing stations where Williams may pick up
     Customer's traffic for the individual cable systems are as set forth in
     Table G.1 below. The origination demarcation point for International
     Backhaul Service shall be at the system interface of the landing station of
     the applicable cable system (the "Origination Demarcation Point"). Customer
     will designate on each Service Order at which cable landing station the
     Service is to originate. Once Williams's picks up the traffic at the cable
     landing station, it will then carry the traffic to one of Williams'
     designated termination points-of-presence ("Termination POP"), which will
     also be specified by Customer on the Service Order. The Termination POPs
     for each landing station are set forth in Table F.1 below.

<Table>
<Caption>
        -----------------------------------------------------------
        TABLE F.1
        -----------------------------------------------------------
             CABLE SYSTEM        *LANDING STATION    TERMINATION
                                                        POINT
        -----------------------------------------------------------
         <S>                    <C>                <C>
                                 San Luis Obispo,  Santa Clara, CA
                                       CA
        -----------------------------------------------------------
                                                   San Francisco,
                                                         CA
        -----------------------------------------------------------
                                                   Sacramento, CA
        -----------------------------------------------------------
                                                   Los Angeles, CA
        -----------------------------------------------------------
         China US Cable            Bandon, OR      Portland, OR
        -----------------------------------------------------------
                                  (NON-DIVERSE)     Seattle, WA
        -----------------------------------------------------------
                                                   Sacramento, CA
        -----------------------------------------------------------
                                                   San Francisco,
                                                         CA
        -----------------------------------------------------------
                                    Bandon, OR     Los Angeles, CA
                                    (DIVERSE)
        -----------------------------------------------------------
                                                   Santa Clara, CA
        -----------------------------------------------------------
                                  Manchester, CA    Santa Clara, CA
        -----------------------------------------------------------
                                   (NON-DIVERSE)   Sacramento, CA
        -----------------------------------------------------------
                                                   San Francisco, CA
        -----------------------------------------------------------
          Japan US Cable                           Los Angeles, CA
        -----------------------------------------------------------
                                                   Santa Clara, CA
        -----------------------------------------------------------
                                                   Sacramento, CA
        -----------------------------------------------------------
                                   Morro Bay, CA   San Francisco, CA
        -----------------------------------------------------------
                                                   Los Angeles, CA
        -----------------------------------------------------------
                                                    Santa Clara,
                                                         CA
        -----------------------------------------------------------
                                                   Sacramento, CA
        -----------------------------------------------------------
          Southern CrossCable       Morro Bay, CA  San Francisco,
              Network                                            CA
        -----------------------------------------------------------
                                                   Los Angeles, CA
        -----------------------------------------------------------
                TAT-14            Tuckerton, NJ    New York City,
                                                         NY
        -----------------------------------------------------------
                         *subject to availability
        -----------------------------------------------------------
</Table>

1.2  PRE-PROVISION OF CIRCUITS WITH AT&T & WORLDCOM. Customer agrees to provide
     Williams with an appropriate Letter of Authorization which will allow
     Williams to pre-provision Customer's requested circuits from the
     appropriate cable landing station operator's cable landing station to the
     system interface of the applicable cable system. Such pre-provisioning will
     be provided by Williams at no charge to Customer. However, Customer shall
     pay all Williams' installation charges for International Backhaul Service
     (as set forth in Section 3 below) once International Backhaul Service is
     available. Williams will not assume any responsibility for such
     pre-provisioning or associated service, which service shall be provided
     directly by the cable landing station operator.

1.3  SERVICE AVAILABILITY. The availability of International Backhaul Service
     depends on the actual in-service date for each of the respective cables and
     landing stations. Under no circumstances shall International Backhaul
     Service be available before the in-service date of the applicable cables
     and landing stations. Currently, it is anticipated that STM-16 will not be
     available for the Japan U.S. landing stations before October 2001, but this
     date is subject to change.

                        Williams Communications                      Page 1 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 9
                         INTERNATIONAL BACKHAUL SERVICE

1.4  LIABILITY FOR THIRD PARTY LOCAL ACCESS SERVICES. In issuing a Service Order
     that includes a request for Third Party Local Access Services, Customer
     should be aware of the anticipated in-service date of the applicable cables
     and landing stations In the event Williams arranges Third Party Local
     Access Services on behalf of Customer in accordance with the terms and
     conditions of the Agreement and Service is not available, because the cable
     system or landing station is not available, Williams shall, (i) begin
     billing Customer for any Third Party Local Access Services arranged by
     Williams on behalf of Customer; or (ii) terminate the Third Party Local
     Access Services arranged by Williams on behalf of Customer and pass through
     to Customer any termination liability incurred by Williams from the Third
     Party Local Access Service provider, whichever is provided by Customer.
     Customer shall pay all Third Party Local Access charges.

                     SECTION 2. RECURRING RATES AND CHARGES

2.1  MONTHLY RECURRING RATES.

     a.  Pricing for International Backhaul Services shall consist of monthly
         recurring charges, one-time installation charges and non-recurring
         charges. Customer's monthly recurring charges shall be determined on an
         individual case basis.

     b.  THIRD PARTY LOCAL ACCESS. Pricing for Third Party Local Access is
         determined in accordance with the terms and conditions set forth in the
         Agreement.

                   SECTION 3. NON-RECURRING RATES AND CHARGES

3. 1 NON-RECURRING RATES. In addition to the monthly recurring charges set forth
     on Customer's Service Order, Customer may incur the following non-recurring
     charges for Services as set forth below in Table F.2.

<Table>
<Caption>
             ----------------------- ------------------------ ---------- ----------- -----------
             TABLE F.2               NON-RECURRING CHARGES      STM-1      STM-4       STM-16
             -----------------------------------------------------------------------------------
             <S>                                             <C>          <C>         <C>
             New Order Installation                            $[***]     $[***]      $[***]
             -----------------------------------------------------------------------------------
             Change Of Service Date Charge (1st change free)   [$***]     $[***]      [$***]
             -----------------------------------------------------------------------------------
             Change Of Service Order Charge
             -----------------------------------------------------------------------------------
                  Pre-Engineering                              $[***]     $[***]      $[***]
             -----------------------------------------------------------------------------------
                  Post-Engineering                             $[***]     $[***]      $[***]
             -----------------------------------------------------------------------------------
             Order Cancellation
             -----------------------------------------------------------------------------------
                  Pre-Engineering                              $[***]     $[***]      $[***]
             -----------------------------------------------------------------------------------
                  Post-Engineering                             $[***]     $[***]      $[***]
             -----------------------------------------------------------------------------------
             Access Service Request (ASR) Special Access       $[***]     $[***]      $[***]
             -----------------------------------------------------------------------------------
             Order Expedite                                    $[***]     $[***]      $[***]
             -----------------------------------------------------------------------------------
</Table>

             In addition to the above charges, Customer is required to
             reimburse Williams for any Third Party Provider charges
             relating to Customer's service. Non-Recurring Charges not
             described above will be considered special requests and will
             be handled on an individual case basis. All of the charges
             stated above are subject to change with thirty (30) calendar
             day's notice. See Exhibit B for a complete description of the
             above charges.
             -------------------------------------------------------------------

3.2  MISCELLANEOUS. Customer should be aware that from time to time, third-party
     charges are levied to Williams after submission of the original Service
     Order from Customer. Williams may be obligated to pass these charges to
     Customer. Williams will inform Customer of any such charges before the
     charges are passed to Customer. Williams cannot commit that all charges
     related to any requested Service will always be on the original Service
     Order.

3.3  NON-RECURRING PRICING. Pricing for Non-Recurring International Backhaul
     Service shall be as set forth in this Section 3 and are subject to change
     upon thirty (30) calendar days' written or electronic notice by Williams to
     Customer. Price changes shall only be effective on a going-forward basis
     and shall not apply to Service Orders placed by Customer and accepted by
     Williams prior to the effective date of the respective price change.

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

<Page>

                        Williams Communications                      Page 2 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

                                   SCHEDULE 9
                         INTERNATIONAL BACKHAUL SERVICE

            SECTION 4. INTERNATIONAL BACKHAUL SERVICES OUTAGE CREDITS

4.1  OUTAGE CREDITS. Customer acknowledges the possibility of an unscheduled,
     continuous and/or interrupted period of time during which when
     International Backhaul Service fails to conform to the Technical
     Specifications set forth below ("Outage"). An Outage shall begin upon the
     earlier of Williams' actual knowledge of the Outage or Williams' receipt of
     notice from the Customer of the Outage. In the event of an Outage, Customer
     shall be entitled to a credit ("Outage Credit") upon Williams' receipt of
     Customer's written request for such Outage Credit. For International
     Backhaul Service, the Outage Credit amount shall be the amount of 1/720 of
     the monthly recurring charge for the interexchange portion of the Service
     for each hour in excess of the first two (2) consecutive hours that the
     affected Service fails to conform to the below Technical Specifications.

4.2  EXCESSIVE OUTAGES. If a single circuit experiences either (a) three (3) or
     more outages of fifteen (15) minutes duration or longer during any thirty
     (30) day period, or (b) one or more outages of fifteen (15) minutes each in
     each of three (3) consecutive months or (c) one (1) outage of more than
     twenty-four (24) consecutive hours in a one (1) calendar month period,
     ("Excessive Outages"), Customer shall be entitled, in addition to the
     applicable Outage Credit, if any, to terminate such circuits as are
     affected by the Excessive Outage without liability for the Early
     Termination Charge set forth in Section 6.4 of the Agreement. However,
     Customer shall be liable for any termination liability associated with
     Third Party Local Access Service or any other Third Party Service
     associated with such disconnection.

     In the event Customer terminates a circuit for an Excessive Outage pursuant
     to this Section 4.2 and such termination causes the Customer to fall below
     their Revenue Commitment, such terminated circuit shall count toward
     Customer's Revenue Commitment as if it had not been terminated.

4.3  REMEDY. The Outage Credit and right to terminate for an Excessive Outage as
     set forth in this Section 4 shall be the sole and exclusive remedy of
     Customer in the event of any Outage and under no circumstances shall an
     Outage be deemed a default under the Agreement.

4.4  LIMITATIONS. Customer shall not receive an Outage Credit if the Outage is:
     (i) of a duration of less than two (2) consecutive hours (ii) caused by
     Customer or others authorized by Customer to use the Services under the
     Agreement; (iii) due to the failure of power, facilities, equipment,
     systems or connections not provided by Williams; (iv) caused by the failure
     of Third Party Local Access Service to Williams' fiber optic network; (v)
     the result of scheduled maintenance where Customer has been notified of
     scheduled maintenance in advance; or (vi) due to a Force Majeure event as
     defined in the Agreement.

4.5  CREDIT PAYMENT. Outage Credits shall be credited on Customer's next monthly
     invoice for the affected Service.

                       SECTION 5. TECHNICAL SPECIFICATIONS

5.1  The Technical Specifications set forth herein are stated as an objective
     that the International Backhaul Services will perform in accordance with
     prevailing telecommunications industry standards. The International
     Backhaul Service provided under this Agreement is measured using two
     variables: Network Availability and Mean-time-to-restore.
     Mean-time-to-restore is addressed in Section 6.3 of this Schedule.

5.2  INTERCONNECTION SPECIFICATIONS

     a.  Optical SONET Services (OC-N). Optical SONET Services are provided in
         accordance with ANSI Standard TL105.

     b.  Optical Synchronous Digital Hierarchy (SDH) Services. SDH Services are
         provided in accordance with ITU standards.

     c.  Network Access and Interfaces. International Backhaul Service provides
         network access at standard SDH (ITU) interfaces capable of
         interconnecting STM-1, STM-4 and 2.5 Gbps Wave single-ended dedicated
         line circuits.

5.3  PROTECTION. The network equipment has a protection capability on a per
     STM-1 and STM-4 circuit basis.

                        Williams Communications                      Page 3 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 9
                         INTERNATIONAL BACKHAUL SERVICE

5.4  DIVERSITY. International Backhaul shall provide Route Diversity between all
     landing stations (excluding certain paths at Bandon) and designated
     termination points. Route Diversity is defined as separate physical paths
     being delivered via two different conduits between the cable landing
     station and the designated Williams' POP.

5.5  AVAILABILITY.
     a. AVAILABILITY ON WILLIAMS' NETWORK. Availability is a measurement of the
     percent of total time that service is operative when measured over a 365
     consecutive day (8760 hour) period. Optical SONET Service is considered
     inoperative when there has been a loss of signal or when two consecutive 15
     second loop-back tests confirm the observation of a bit error rate equal to

         Or worse than 1 x 10-(6). For Services on Williams' network,
     availability shall be 99.95% from the Origination Demarcation Point (as
     defined in Section 1.1 of this Schedule) to Williams' Termination POP
     measured over a one (1) year period.

     b. AVAILABILITY FOR SERVICES NOT ON WILLIAMS' NETWORK. For Services not on
     Williams' network, the Third Party Provider will establish availability.
     The Third Party Local Access availability standards for Third Party Local
     Access Services are established by the Third Party Local Access Provider.
     See General Provisions for other factors affecting availability.

5.6  PERFORMANCE (% ERROR FREE SECONDS, WHILE AVAILABLE). Performance is noted
     in Error Free Seconds, which are a measure of the percentage of total
     seconds that do not contain bit errors when measured over a consecutive
     twenty-four (24) hour period. Performance shall be measured on a one-way
     basis using a Pseudo Random Bit Sequence test pattern as defined in CCITT
     Recommendation 0.151. For Services on Williams' network, Error Free Seconds
     shall be 99.5% from the Origination Demarcation Point (as defined in
     Section 1.1 of this Schedule) to Williams' Termination POP measured over a
     one (1) year period. Error Free Seconds for Services not on Williams'
     Network. The Error Free Seconds standards for Third Party Local Access
     Services is established by the Third Party Local Access Provider. For
     Services not on Williams' network, the Third Party Provider will establish
     Error Free Seconds.

       SECTION 6. GENERAL PROVISIONS RELATING TO TECHNICAL SPECIFICATIONS

6.1  QUALITY STANDARDS. Standards apply on a one-way basis between the
     Origination Demarcation Point (as defined in Section 1.1 of this Service
     Schedule) and Williams' Termination POP only. All standards exclude
     nonperformance due to force majeure or planned interruptions for necessary
     maintenance purposes. All standards exclude nonperformance due to acts or
     omissions of Customer or due to any failure of Customer-provided equipment.

6.2  MAINTENANCE. Williams will undertake repair efforts on equipment or fiber
     when Williams first becomes aware of it, or when notified by Customer and
     Customer has released all or part of the Service for testing. The
     maintenance standards in this Section 6 only apply for Equipment or Fiber
     on Williams' owned and operated network and from the Origination
     Demarcation Point (as defined in Section 1.1 of this Service Schedule) to
     Williams' Termination POP.

6.3  MEAN TIME TO RESTORE ("MTTR"). Mean Time to Restore is be the average time
     required to restore service and resume availability and is stated in terms
     of equipment and cable outages. The time is measured from the moment the
     outage is reported until the service is available. With respect to
     International Backhaul Service, Williams has an objective of repairing
     network equipment within an average of two (2) hours and an objective to
     have the first fiber on a cable cut restored within an average of six (6)
     hours. Williams will undertake repair efforts on equipment or fiber when
     Williams first becomes aware of the problem, or when notified by Customer
     and Customer has released all or part of the Service for testing. The
     maintenance standards in this Section 6.3 only apply for equipment or fiber
     on Williams' owned and operated network and from Williams' POP to Williams'
     POP.

6.4  CALCULATION. Williams calculates network availability upon written request
     from customers. Customer must notify the Williams Service Delivery and
     initiate an action request to determine if the standards stated above were
     met.

                        Williams Communications                      Page 4 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 9
                         INTERNATIONAL BACKHAUL SERVICE

                          SECTION 7. PRODUCT INTERVALS

7.1  SERVICE  IMPLEMENTATION  INTERVALS.  Williams' standard service
     implementation  interval for International Backhaul Service is
     [***] days (a) from acceptance of a Service Order by Williams' Service
     Delivery department (if the applicable cable station is already in service)
     or (b) (if Williams has accepted the Service Order before the in-service
     date of the applicable cable station) from the in-service date of the
     applicable cable station, whichever is later. Under no circumstances shall
     the standard service implementation interval period start running before
     Service is available. Williams shall make reasonable efforts to provide
     International Backhaul Service within its standard service implementation
     interval as determined in accordance herewith. Failure of Williams to
     deliver by such date shall not constitute a default under the Agreement and
     Williams shall not be liable to pay to Customer any penalties or damages
     for Williams' failure to meet such standard service implementation
     intervals except as set forth in Section 3.4 of the Agreement.

                 SECTION 8. PLANNED NETWORK MAINTENANCE ACTIVITY

8.1  TIMING. Williams shall avoid performing network maintenance between 0600 to
     2200 Central Time (or local time with respect to facilities comprising
     international Service), Monday through Friday, inclusive, that will have a
     disruptive impact on the continuity or performance level of Customer's
     Service. However, the preceding sentence does not apply to restoration of
     continuity to a severed or partially severed fiber optic cable, restoration
     of dysfunctional power and ancillary support equipment, or correction of
     any potential jeopardy conditions. Williams will use commercially
     reasonable efforts to notify Customer prior to emergency maintenance.

8.2  NOTICE. Williams shall provide Customer with electronic mail, telephone,
     facsimile, or written notice of all non-emergency, planned network
     maintenance (i) not less than [***] business days prior to performing
     maintenance that, in its reasonable opinion, has a substantial likelihood
     of affecting Customer's traffic for up to fifty (50) milliseconds, and (ii)
     not less than [***] business days prior to performing maintenance that, in
     its reasonable opinion, has a substantial likelihood of affecting Customer
     traffic for more than fifty (50) milliseconds. If Williams' planned
     activity is canceled or delayed, Williams shall promptly notify Customer
     and shall comply with the provisions of this Section to reschedule any
     delayed activity.

                               SECTION 9. WARRANTY

Williams warrants that International Backhaul Service shall be provided to
Customer in accordance with the applicable Technical Specifications set forth in
Section 5 of this Schedule. Williams shall use commercially reasonable efforts
under the circumstances to remedy any delays, interruptions, omissions,
mistakes, accidents or errors in the Services and restore such Services to
compliance with the Technical Specifications. THE FOREGOING WARRANTY IS THE SOLE
AND EXCLUSIVE WARRANTY MADE BY WILLIAMS WITH RESPECT TO THE SERVICES PROVIDED
UNDER THIS SCHEDULE 9 AND SUCH WARRANTY IS PROVIDED IN LIEU OF ALL OTHER
WARRANTIES WHETHER EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE OUTAGE
CREDITS REMEDY PROVIDED TO CUSTOMER AS SET FORTH IN SECTION 4 OF THIS SCHEDULE
IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO CUSTOMER AND IS IN LIEU OF ALL
OTHER REMEDIES, REGARDLESS OF WHETHER THIS WARRANTY FAILS OF ITS ESSENTIAL
PURPOSE.

[Remainder of page left intentionally blank]

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 5 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 9
                         INTERNATIONAL BACKHAUL SERVICE

IN WITNESS WHEREOF, THE PARTIES HAVE INDICATED THEIR AGREEMENT BY SIGNING BELOW

    UNIVERSAL ACCESS, INC.:               WILLIAMS COMMUNICATIONS, LLC:

    /s/ Robert E. Rainone                 /s/ Howard Janzen
    ------------------------------------  --------------------------------------
    Signature of Authorized               Signature of Authorized
    Representative                        Representative
    Robert E. Rainone                     Howard Janzen
    ------------------------------------  --------------------------------------
    Printed Name                          Printed Name
    President, Global Operations          President and Chief Executive Officer
    ------------------------------------  --------------------------------------
    Title                                 Title
    10/03/01                              10/03/01
    ------------------------------------  --------------------------------------
    Date                                  Date

                        Williams Communications                      Page 6 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 10
                       INTERNATIONAL PRIVATE LINE SERVICE

         This Service Schedule is subject to that Master Services Agreement No.
________________ ("Agreement") by and between Williams Communications, LLC
("Williams"), and Customer.

                 SECTION 1. INTERNATIONAL PRIVATE LINE SERVICES

1.1  SERVICE DESCRIPTION. Williams International Private Line Service (the
     "International Private Line Service") provides international circuits at
     varying speeds which are specifically dedicated to Customer's use between
     two (2) points specified by the parties in a Service Order and meeting the
     technical requirements as defined below in the Technical Specifications.

                     SECTION 2. RECURRING RATES AND CHARGES

2.1  MONTHLY RECURRING RATES. Pricing for any International Private Line Service
     is determined on an individual case basis and will be set forth on
     Customer's Service Order. Pricing and arranging for Third Party Local
     Access Service is determined in accordance with the terms and conditions
     set forth in the Agreement.

                   SECTION 3. NON-RECURRING RATES AND CHARGES

3.1  NON-RECURRING CHARGES. Non-Recurring Charges may be incurred for Private
     Line connections. Non-recurring Charges include, but are not limited to new
     order installation, change of service date charge, change of service order
     charge (pre-installation and post installation), order cancellation
     (pre-installation and post-installation) and cancellation charges related
     to Third Party Local Access service for which Williams is acting as agent,
     ASR (new or disconnect) special access, ASR supplement, order expedite,
     reconfiguration, and additional installation/maintenance/engineering during
     and after hours. Non-recurring charges for the Services or other services
     agreed to by the parties as set forth above will be set forth on Customer's
     Service Order.

3.2  INSTALLATION CHARGES. Installation charges shall apply to the normal
     installation of equipment necessary to provide the requested service to the
     point of demarcation at the Customer's premises. Additional installation
     charges shall apply when Williams is required to install equipment other
     than that normally required to provide the service or when Customer
     requests special equipment.

3.3  NON-RECURRING CHARGES. Non-Recurring Charges not described above will be
     considered special requests and will be handled on an individual case
     basis. All Non-Recurring Charges are subject to change with thirty (30)
     calendar days' notice. Price changes shall only be effective on a
     going-forward basis and shall not apply to Service Orders placed by
     Customer and accepted by Williams prior to the effective date of the
     respective price change.

3.4  MISCELLANEOUS. Customer should be aware that from time to time, third-party
     charges are levied to Williams after submission of the original Service
     Order from Customer. Williams may be obligated to pass these charges to
     Customer. Williams will inform Customer of any such charges before the
     charges are passed to Customer. Williams cannot commit that all charges
     related to any requested Service will always be on the original Service
     Order.

                            SECTION 4. OUTAGE CREDITS

4.1  OUTAGE CREDITS. Customer acknowledges the possibility of an unscheduled,
     continuous and/or interrupted period of time during which period of time
     International Private Line Service fails to conform to the Technical
     Specifications ("Outage"). An Outage shall begin upon the earlier of
     Williams' actual knowledge of the Outage or Williams' receipt of notice
     from the Customer of the Outage. In the event of an Outage, Customer shall
     be entitled to a credit ("Outage Credit") upon Williams' receipt of
     Customer's written request for such Outage Credit. For the domestic USA
     interexchange portion of International Private Line Service, the Outage
     Credit amount shall be the amount of 1/720 of the monthly recurring charge
     for each hour in excess of the first two (2) consecutive hours that the
     affected Service fails to conform to the below Technical Specifications.
     For Outages due to a submarine cable failure, Williams shall pass through
     outage credits, if any, it may receive from the cable administrator.

4.2  REMEDY. The Outage Credit as set forth in this Section 4 shall be the sole
     and exclusive remedy of Customer in the event of any Outage and under no
     circumstances shall an Outage be deemed a default under the Agreement.

                        Williams Communications                      Page 1 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 10
                       INTERNATIONAL PRIVATE LINE SERVICE

4.3  LIMITATIONS. Customer shall not receive an Outage Credit if the Outage is:
     (i) of a duration of less than two (2) consecutive hours (ii) caused by
     Customer or others authorized by Customer to use the Services under the
     Agreement; (iii) due to the failure of power, facilities, equipment,
     systems or connections not provided by Williams; (iv) caused by the failure
     of Third Party Local Access Service to Williams' fiber optic network; (v)
     the result of scheduled maintenance where Customer has been notified of
     scheduled maintenance in advance; or (vi) due to a Force Majeure event as
     defined in the Agreement.

4.4  CREDIT PAYMENT.  Outage Credits shall be credited on the Customer's next
     monthly invoice for the affected Service.

                       SECTION 5. TECHNICAL SPECIFICATIONS

5.1  SPECIFICATIONS. Williams' International Private Line Services ("IPL"s) meet
     or exceed the International Telecommunications Union's ("ITU"'s)
     recommendations. The ITU specifications for circuit performance parameters
     are set forth below in Table G.1.

<Table>
<Caption>
           ----------------------------------------------------------
           TABLE G.1
           ----------------------------------------------------------
           <S>                             <C>
           Errored Seconds (ES)            Compliant to M.2100
           ----------------------------------------------------------
           Severely Errored Seconds (SES)  Compliant to M.2100
           ----------------------------------------------------------
           Availability                    Compliant to G.822
           ----------------------------------------------------------
</Table>

5.2  WILLIAMS' PERFORMANCE OBJECTIVES. Williams' minimum performance objectives
     are detailed in the table below. These parameters are the provisioning
     specifications used for 24-hour end-to-end tests, and are derived from ITU
     specifications. In most cases, Williams' circuit performance outperforms
     these objectives by a substantial margin as set forth below in Table G.2.

<Table>
<Caption>
           ---------------------------------------------------------
           TABLE G.2
           ---------------------------------------------------------
           PERFORMANCE OBJECTIVE         SATELLITE      CABLE
           ---------------------------------------------------------
           <S>                           <C>            <C>
           Bit Error Ratio (BER)         < 10(6)        < 10(7)
           ---------------------------------------------------------
           Synchronization Loss          < 5            < 3
           ---------------------------------------------------------
           Error Free Seconds (EFS)      > 98.5 %       > 99.5 %
           ---------------------------------------------------------
           ITU Availability              > 99.0 %       > 99.6 %
           ---------------------------------------------------------
</Table>

5.3  SERVICE LEVEL AGREEMENTS. A Service Level Agreement ("SLA") is available on
     Customer's request depending on the route chosen. The route-specific SLA
     will not only be dependent on the origination and destination locations,
     but also on the specific fiber-optic cable or satellite over which the
     traffic will travel. These specific SLAs are more accurate and clearly
     demonstrate the high quality of service Williams provides to its clients.

5.4  FOREIGN CARRIER ROUTES. Please note that any route involving a Foreign
     Carrier or other carrier will generally not be covered in a Williams SLA,
     as the Foreign Carrier's operations are not under the control of Williams.
     Nevertheless, these carriers will also comply with the ITU specifications
     for circuit performance parameters. For any route that consists of a
     submarine cable, the submarine cable portion of the route will generally
     not be covered by an SLA but shall comply with the technical specifications
     set forth for the particular submarine cable system specified below, which
     specifications will be provided to Customer upon Customer's request.

                  SUBMARINE CABLE SYSTEM    (subject to availability)
                  ----------------------
                  China-U.S. Cable          / /
                  Southern Cross Cable      / /
                  TAT-14 Cable              / /
                  Japan-U.S. Cable          / /

5.5  MEAN TIME TO RESTORE. Mean Time to Restore (MTTR) shall be the average time
     required to restore service and resume availability and is stated in terms
     of equipment and cable outages. The time is measured from the moment the
     outage is reported until the service is available. With respect to
     International Private Line Service, Williams has an objective of repairing
     network equipment within an average of two (2) hours and an objective to
     have the first fiber on a cable cut restored within an average of six (6)
     hours. Williams will undertake repair efforts on equipment or fiber when
     Williams first becomes aware of the problem, or when notified by Customer
     and Customer has released all or part of the Service for testing. The
     maintenance standards in this Section 5.5 only apply for equipment or fiber
     on Williams' owned and operated network and from Williams' POP to Williams'
     POP.

                        Williams Communications                      Page 2 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 10
                       INTERNATIONAL PRIVATE LINE SERVICE

                          SECTION 6. PRODUCT INTERVALS

6.1  IMPLEMENTATION INTERVALS. Williams' standard service implementation
     interval shall be determined on an individual case basis. Williams shall
     make reasonable efforts to provide International Private Line Service
     within its standard service implementation interval. Failure of Williams to
     deliver by such date shall not constitute a default under the Agreement and
     Williams shall not be liable to pay to Customer any penalties or damages
     for Williams' failure to meet such standard service implementation
     intervals.

                 SECTION 7. PLANNED NETWORK MAINTENANCE ACTIVITY

7.1  TIMING. Williams shall avoid performing network maintenance between 0600 to
     2200 Central Time (or local time with respect to facilities comprising
     international Service), Monday through Friday, inclusive, that will have a
     disruptive impact on the continuity or performance level of Customer's
     Service. However, the preceding sentence does not apply to restoration of
     continuity to a severed or partially severed fiber optic cable, restoration
     of dysfunctional power and ancillary support equipment, or correction of
     any potential jeopardy conditions. Williams will use commercially
     reasonable efforts to notify Customer prior to emergency maintenance.

7.2  NOTICE. Williams shall provide Customer with electronic mail, telephone,
     facsimile, or written notice of all non-emergency, planned network
     maintenance (i) not less than [***] business days prior to performing
     maintenance that, in its reasonable opinion, has a substantial likelihood
     of affecting Customer traffic for up to fifty (50) milliseconds, and (ii)
     not less than [***] business days prior to performing maintenance that, in
     its reasonable opinion, has a substantial likelihood of affecting Customer
     traffic for more than fifty (50) milliseconde. If Williams' planned
     activity is canceled or delayed, Williams shall promptly notify Customer
     and shall comply with the provisions of this Section to reschedule any
     delayed activity.

                               SECTION 8. WARRANTY

Williams warrants that International Private Line Service shall be provided to
Customer in accordance with the applicable Technical Specifications set forth in
Section 5 of this Schedule. Williams shall use commercially reasonable efforts
under the circumstances to remedy any delays, interruptions, omissions,
mistakes, accidents or errors in the Services and restore such Services to
compliance with the Technical Specifications. THE FOREGOING WARRANTY IS THE SOLE
AND EXCLUSIVE WARRANTY AND IS PROVIDED IN LIEU OF ALL OTHER WARRANTIES WHETHER
EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTY OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE OUTAGE CREDITS REMEDY
PROVIDED TO CUSTOMER AS SET FORTH IN SECTION 4 OF THIS SCHEDULE IS THE SOLE AND
EXCLUSIVE REMEDY PROVIDED TO CUSTOMER AND IS IN LIEU OF ALL OTHER REMEDIES,
REGARDLESS OF WHETHER THIS WARRANTY FAILS OF ITS ESSENTIAL PURPOSE.

[Remainder of page left intentionally blank]

----------
***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 3 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 10
                       INTERNATIONAL PRIVATE LINE SERVICE

IN WITNESS WHEREOF, THE PARTIES HAVE INDICATED THEIR AGREEMENT BY SIGNING BELOW

    UNIVERSAL ACCESS, INC.:            WILLIAMS COMMUNICATIONS, LLC:

    /s/ Robert E. Rainone              /s/ Howard Janzen
    --------------------------------   -----------------------------------------
    Signature of Authorized            Signature of Authorized
    Representative                     Representative
    Robert E. Rainone                  Howard Janzen
    --------------------------------   -----------------------------------------
    Printed Name                       Printed Name
    President, Global Operations       President and Chief Executive Officer
    --------------------------------   -----------------------------------------
    Title                              Title
    10/03/01                           10/03/01
    --------------------------------   -----------------------------------------
    Date                               Date

                        Williams Communications                      Page 4 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 13
                        METRO ACCESS PRIVATE LINE SERVICE

         This Service Schedule is subject to that Master Services Agreement No.
________________ ("Agreement") by and between Williams Communications, LLC
("Williams"), and Customer. Williams may designate an affiliate to provide any
portion of the Metro Access Private Line Service then for purposes of this
Schedule 13.

                     SECTION 1. METRO PRIVATE LINE SERVICES

1.1  SERVICE DESCRIPTION. Williams' Metro Access Private Line Service ("Metro
     Private Line Service") provides domestic DS-3 and Optical SONET (OC-3,
     OC-12 and OC-48) circuits, which are located entirely upon Williams owned
     and operated network with both end points of such circuit located within
     the same city and at a Williams metro access point ("MAP"). Metro Private
     Line Service is specifically dedicated to Customer's use between two (2)
     points specified by the parties in a Service Order and will meet the
     Technical Specifications as defined below in Section 6.

                         SECTION 2. SERVICE AVAILABILITY

2.1  SERVICE AVAILABILITY.   Williams offers Metro Private Line Service in the
     cities set forth below:

<Table>
<Caption>
         ---------------------------------------------------------------
                METRO ACCESS PRIVATE LINE CITIES

                                 2001
         ---------------------------------------------------------------
         <S>                    <C>                 <C>
         Atlanta                Los Angeles         San Diego
         Baltimore              Miami               St. Louis
         Boston                 Minneapolis         San Francisco
         Chicago                Newark              San Jose
         Dallas                 New York            Seattle
         Denver                 Philadelphia        Washington, D.C.
         Houston                Phoenix
         ---------------------- ------------------- --------------------
</Table>

                     SECTION 3. RECURRING RATES AND CHARGES

3.1  MONTHLY RECURRING RATES.

     a.  Monthly recurring charges for Metro Private Line Service are set forth
         in table K.1 below, and include both a fixed and variable component.
         The fixed rate is based upon the Metro city and type of circuit
         ordered. The variable rate is based upon the mileage between the
         Williams MAPS, which constitute the end points of the Metro Private
         Line Service. Customer shall also pay any monthly Metro Private Line
         interconnect charges.

<Table>
<Caption>
         ----------------------------------------------------------------------------------------
              TABLE K.1                                  MONTHLY RECURRING RATES
         ----------------------------------------------------------------------------------------
         1 YEAR PRICING          DS-3              OC-3              OC-12              OC-48
         ----------------------------------------------------------------------------------------
                REGION         0-15     additiona  0-15   additiona  0-15   additiona  0-15 miles
                                miles   mileage    miles   mileage   miles   mileage
         ----------------------------------------------------------------------------------------
         <S>                    <C>      <C>      <C>       <C>      <C>      <C>       <C>
         AMERITECH              $[***]   $[***]   $[***]    $[***]   $[***]   $[***]    $[***]
         BELL ATLANTIC & NYNEX  $[***]   $[***]   $[***]    $[***]   $[***]   $[***]    $[***]
         BELL SOUTH             $[***]   $[***]   $[***]    $[***]   $[***]   $[***]    $[***]
         PAC BELL               $[***]   $[***]   $[***]    $[***]   $[***]   $[***]    $[***]
         SWBELL                 $[***]   $[***]   $[***]    $[***]   $[***]   $[***]    $[***]
         USWEST                 $[***]   $[***]   $[***]    $[***]   $[***]   $[***]    $[***]
         ----------------------------------------------------------------------------------------
</Table>

     b.  THIRD PARTY LOCAL ACCESS SERVICE. Customer shall execute a Letter of
         Agency, in a form provided by Williams, authorizing Williams to deal
         directly with Third Party Local Access Provider(s) to obtain the
         necessary Third Party Service on behalf of the Customer. Customer shall
         pay all charges including, without limitation, monthly charges, usage
         charges, installation charges, non-recurring charges, or Third Party
         Local Access Provider(s). When Williams orders Third Party Local Access
         Services for Customer, Williams shall coordinate the installation of
         the Third Party Local

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***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 1 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 13
                        METRO ACCESS PRIVATE LINE SERVICE

         Access Service, and conduct the initial testing of an interconnection
         between the Williams' Service and the Third Party Local Access Service.
         The Customer's charge for Third Party Local Access Service ordered by
         Williams shall accrue at the then current tariff rate (or the standard
         published rate, if there is no tariff rate) of the Third Party
         Provider; and any changes in that rate will be passed through to the
         Customer. When Williams orders Third Party Local Access Services,
         Williams shall not begin billing Customer for such Third Party Local
         Access Services until the Start of Service for any related Williams
         Services. Customer may order its own Third Party Local Access Services
         with a vendor who has established entrance facilities in a Williams'
         POP or other vendors with Williams' prior written permission. When
         Customer orders its own Third Party Local Access Service, its provider
         shall directly bill Customer for Services. In addition, Williams may
         charge Customer for any associated entrance facility or mileage charges
         if it provides a carrier facility assignment ("CFA") to Customer.
         Customer shall be responsible for having the Customer-ordered Third
         Party Local Access Services turned up and shall be obligated to pay for
         Williams' Services regardless of whether the Customer ordered Third
         Party Local Access Services are available. It is understood that
         Article 4 of the Agreement shall have no application to the provision
         of Metro Private Line Services under this Schedule 13.

                   SECTION 4. NON-RECURRING RATES AND CHARGES

4.1  NON-RECURRING CHARGES.  Non-Recurring Charges may apply to Metro Private
     Line connections.  Non-Recurring Charges are set forth in Table K.2 below.

<Table>
<Caption>
     ----------------------------------------------------------------------------------------------
     TABLE K.2               NON-RECURRING CHARGES        DS-3        OC-3       OC-12      OC-48
     ----------------------------------------------------------------------------------------------
     <S>                                               <C>           <C>         <C>       <C>
     Installation                                       $[***]      $[***]      $[***]    $[***]
     ----------------------------------------------------------------------------------------------
     Change Of Service Order Charge
     ----------------------------------------------------------------------------------------------
          Pre-install                                   $[***]      $[***]      $[***]    $[***]
     ----------------------------------------------------------------------------------------------
          Post-install                                  $[***]      $[***]      $[***]    $[***]
     ----------------------------------------------------------------------------------------------
     Order Cancellation                                 $[***]      $[***]      $[***]    $[***]
     ----------------------------------------------------------------------------------------------
     Order Expedite                                     $[***]      $[***]      $[***]    $[***]
     ----------------------------------------------------------------------------------------------
     Cross Connect Install Charge                       $[***]      $[***]      $[***]    $[***]
     ----------------------------------------------------------------------------------------------
</Table>

4.2  INSTALLATION CHARGES. For Williams Services, installation charges shall
     [***].

4.3  MISCELLANEOUS. Customer should be aware that from time to time, charges of
     Third Party Providers are levied against Williams after submission of the
     original Service Order from Customer. Williams will pass these charges
     through to Customer. Williams will inform Customer of any such charges
     before the charges are passed to Customer. Williams cannot guarantee that
     all charges related to any requested Metro Private Line Service will always
     be on the original Service Order.

4.4  NON-RECURRING PRICING. Pricing for Non-Recurring Metro Access Service shall
     be as set forth in this Section 4 and are subject to change upon thirty
     (30) calendar days' written or electronic notice by Williams to Customer.
     Price changes shall only be effective on a going-forward basis and shall
     not apply to Service Orders placed by Customer and accepted by Williams
     prior to the effective date of the respective price change.

                            SECTION 5. OUTAGE CREDITS

5.1  OUTAGE CREDITS. Customer acknowledges the possibility of an unscheduled,
     continuous and/or interrupted period of time during which Metro Private
     Line Service fails to conform to the Technical Specifications below
     ("Outage"). An Outage shall begin upon the earlier of Williams' actual
     knowledge of the Outage or Williams' receipt of notice from the Customer of
     the Outage. In the event of an Outage, Customer shall be entitled to a
     credit ("Outage Credit") upon Williams' receipt of Customer's written
     request for such Outage Credit. The amount of the Outage Credit for Metro
     Private Line Service shall be an amount equal to 1/720 of the monthly
     recurring charge for that portion of the Metro Private Line Service which
     is subject to the Outage for each hour in excess of the first two (2)
     consecutive hours that the affected Metro Private Line Service fails to
     conform to the Technical Specifications set forth below.

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***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 2 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 13
                        METRO ACCESS PRIVATE LINE SERVICE

5.2  EXCESSIVE OUTAGES. If a single circuit experiences either (a) three (3) or
     more outages of fifteen (15) minutes duration or longer during any thirty
     (30) day period, or (b) one or more outages of fifteen (15) minutes each in
     each of three consecutive months or (c) one (1) outage of more than
     twenty-four (24) consecutive hours in a one (1) calendar month period,
     ("Excessive Outage"), Customer shall be entitled, in addition to the
     applicable Outage Credit, if any, to terminate such circuits as are
     affected by the Excessive Outage without liability for the Early
     Termination Charge set forth in Section 6.4 of the Agreement. However,
     Customer shall be liable for any termination liability associated with
     Third Party Local Access Service or any other Third Party Service
     associated with such disconnection.

     In the event Customer terminates a circuit for an Excessive Outage pursuant
     to this Section and such termination causes the Customer to fall below
     their Revenue Commitment, such terminated circuit shall count toward
     Customer's Annual Commitment as if it had not been terminated.

5.3  REMEDY. The Outage Credit and the right to terminate for an Excessive
     Outage as set forth in this Section 5 shall be the sole and exclusive
     remedy of Customer in the event of any Outage and under no circumstances
     shall an Outage be deemed a default under the Agreement.

5.4  LIMITATIONS. Customer shall not receive an Outage Credit if the Outage is:
     (i) of a duration of less than two (2) consecutive hours; (ii) caused by
     Customer or others authorized by Customer to use the Metro Private Line
     Services under the MSA; (iii) due to the failure of power, facilities,
     equipment, systems or connections not provided by Williams; (iv) caused by
     the failure of Third Party Local Access Service to Williams' owned and
     operated network; (v) the result of scheduled maintenance where Customer
     has been notified of scheduled maintenance in advance; or (vi) due to a
     Force Majeure event as defined in Section 8.5 of the Agreement.

5.5  CREDIT PAYMENT. Williams shall credit Customer with Outage Credits on the
     next monthly invoice for the affected Service.

                       SECTION 6. TECHNICAL SPECIFICATIONS

6.1  TECHNICAL SPECIFICATIONS. Interconnection Specifications for DS-3 service
     are as set forth in ANSI Standard T1.102 and T1.404. DS-3 Service operates
     at 44.736 Mbps. Williams provides Optical SONET Services in accordance with
     ANSI Standard T1.105. OC-3 Service operates at 155.520 Mbps and is
     configured with 3 separate STS-1 signaling paths. OC-3C Service operates at
     155.520 Mbps and is configured with 1 STS-3C signaling path (or 3
     concatenated STS-1 signaling paths). OC-12 Service operates at 622.080 Mbps
     with 12 separate STS-1 signaling paths. OC-12C Service operates at 622.080
     Mbps with 1 STS-12C signaling path (or 4 separate STS-3C signaling paths).
     OC-48 Service operates at 2488.320 Mbps and is configured with 48 separate
     STS-1 signaling paths. The standards by which Williams' Metro Private Line
     Services are measured apply on a one-way basis between Williams' MAPs only.

6.2  NETWORK AVAILABILITY. Network Availability is a measurement of the percent
     of total time that service is operative when measured over a 365
     consecutive day (8760 hour) period. DS-3 and Optical SONET Services are
     considered inoperative when there has been a loss of signal or when two
     consecutive 15 second loop-back tests confirm the observation of a bit
     error rate equal to or worse than 1 x 10-6. For DS-N level Services on
     Williams' network, availability shall be 99.95% from MAP to MAP measured
     over a one-year period. For OC-N level Services on Williams' network,
     availability shall be 99.95% from MAP to MAP measured over a one-year
     period. Network availability standards for Third Party Services shall be
     established by the Third Party Provider.

6.3  MEAN TIME TO RESTORE. Mean Time to Restore (MTTR) shall be the average time
     required to restore service and resume availability and is stated in terms
     of equipment and cable outages. The time is measured from the moment the
     outage is reported until the service is available. With respect to Metro
     Private Line Service, Williams has an objective of repairing network
     equipment within an average of two (2) hours and an objective to have the
     first fiber on a cable cut restored within an average of six (6) hours.
     Williams will undertake repair efforts on equipment or fiber when Williams
     first becomes aware of the problem, or when notified by Customer and
     Customer has released all or part of the Service for testing. The
     maintenance standards in this Section 6.3 only apply for equipment or fiber
     on Williams' owned and operated network and from Williams' MAP to Williams'
     MAP.

6.3  ERROR FREE SECONDS. Performance is noted in Error Free Seconds (Error Free
     Seconds ("EFS"), while Available) which is a measure of the percentage of
     total seconds that do not contain bit errors over a consecutive twenty-four
     (24) hour period. Performance shall be measured on a one-way basis using a
     Pseudo Random Bit Sequence test pattern as defined in CCITT

                        Williams Communications                      Page 3 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 13
                        METRO ACCESS PRIVATE LINE SERVICE

     Recommendation 0.151. For Services on Williams' owned and operated network,
     EFS shall be 99.5% from MAP to MAP measured over a one-year period. For
     Third Party Services, the EFS standards shall be established by the Third
     Party provider.

                          SECTION 7. PRODUCT INTERVALS

7.1  IMPLEMENTATION INTERVALS. Williams' standard service implementation
     interval for DS(N) and OC(N) Service is set forth below in Table K.3. Third
     Party Service implementation intervals shall be determined on an individual
     case basis. Williams shall make reasonable efforts to provide Williams'
     Services within its standard service implementation interval. Failure of
     Williams to deliver by such date shall not constitute a default under the
     Agreement and Williams shall not be liable to pay to Customer any penalties
     or damages for Williams' failure to meet such standard service
     implementation intervals.

<Table>
<Caption>
             -----------------------------------------------------
             TABLE K.3 IMPLEMENTATION INTERVALS
             -----------------------------------------------------
                                             STANDARD INTERVAL
                 SERVICE TYPE                    MAP TO MAP
             -----------------------------------------------------
                  <S>                       <C>
                  DS-1                             [***]
             -----------------------------------------------------
                  DS-3                      [***] calendar days
             -----------------------------------------------------
                  OC-3                      [***] calendar days
             -----------------------------------------------------
                  OC-12                     [***] calendar days
             -----------------------------------------------------
                  OC-48                             IBC
             -----------------------------------------------------
                  OC-48 Wave                        IBC
             -----------------------------------------------------
</Table>

                 SECTION 8. PLANNED NETWORK MAINTENANCE ACTIVITY

8.1  TIMING. Williams shall avoid performing network maintenance between 0600 to
     2200 Central Time, Monday through Friday, inclusive, that will have a
     disruptive impact on the continuity or performance level of Customer's
     Metro Private Line Service. However, the preceding sentence does not apply
     to restoration of continuity to a severed or partially severed fiber optic
     cable, restoration of dysfunctional power and ancillary support equipment,
     or correction of any potential jeopardy conditions. Williams will use
     commercially reasonable efforts to notify Customer prior to emergency
     maintenance.

8.2  NOTICE. Williams shall provide Customer with electronic mail, telephone,
     facsimile, or written notice of all non emergency, planned network
     maintenance: (i) not less than [***] business days prior to performing
     maintenance that, in its reasonable opinion, has a substantial likelihood
     of affecting Customer's traffic for up to fifty (50) milliseconds, and (ii)
     not less than [***] business days prior to performing maintenance that, in
     its reasonable opinion, has a substantial likelihood of affecting Customer
     traffic for more than fifty (50) milliseconds. If Williams' planned
     activity is cancelled or delayed, Williams shall promptly notify Customer
     and shall comply with the provisions of this Section to reschedule any
     delayed activity.

                               SECTION 9. WARRANTY

Williams warrants that it shall provide Metro Private Line Service in accordance
with the applicable Technical Specifications set forth above. Williams shall use
commercially reasonable efforts under the circumstances to remedy any delays,
interruptions, omissions, mistakes, accidents or errors in the Service and
restore such Service to comply with the terms hereof. THE FOREGOING WARRANTY IS
THE SOLE AND EXCLUSIVE WARRANTY AND IS PROVIDED IN LIEU OF ALL OTHER WARRANTIES
WHETHER EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTY OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE OUTAGE CREDITS REMEDY
PROVIDED TO CUSTOMER AS SET FORTH IN SECTION 5 OF THIS SERVICE SCHEDULE IS THE
SOLE AND EXCLUSIVE REMEDY PROVIDED TO CUSTOMER AND IS IN LIEU OF ALL OTHER
REMEDIES, REGARDLESS OF WHETHER THIS WARRANTY FAILS OF ITS ESSENTIAL PURPOSE.

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***  Certain information on this page has been omitted and filed separately with
     the Commission. Confidential treatment has been requested with respect to
     the omitted portions.

                        Williams Communications                      Page 4 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 13
                        METRO ACCESS PRIVATE LINE SERVICE

                           SECTION 10. FCC REGULATION

Customer represents that more than ten percent (10%) of the total traffic
   carried on each circuit provided pursuant to this Service Schedule is
   interstate (including international) traffic. If it is determined at any
   time that any circuit provided hereunder is subject to regulation by a U.S.
   state regulatory agency, the service or circuit may be provided by Williams
   or its affiliates pursuant to applicable state laws, regulations and
   applicable tariffs, or Williams and its affiliates my discontinue provision
   of the affected Service or circuit.

                        Williams Communications                      Page 5 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

<Page>

                                   SCHEDULE 13
                        METRO ACCESS PRIVATE LINE SERVICE

IN WITNESS WHEREOF, THE PARTIES HAVE INDICATED THEIR AGREEMENT BY SIGNING BELOW.

    UNIVERSAL ACCESS, INC.:            WILLIAMS COMMUNICATIONS, LLC:

    /s/ Robert E. Rainone              /s/ Howard Janzen
    -------------------------------    -----------------------------------------
    Signature of Authorized            Signature of Authorized
    Representative                     Representative
    Robert E. Rainone                  Howard Janzen
    -------------------------------    -----------------------------------------
    Printed Name                       Printed Name
    President, Global Operations       President and Chief Executive Officer
    -------------------------------    -----------------------------------------
    Title                              Title
    10/03/01                           10/03/01
    -------------------------------    -----------------------------------------
    Date                               Date

                        Williams Communications                      Page 6 of 5
[WILLIAMS LOGO]        Proprietary & Confidential           AGREEMENT (06/25/01)

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