Document:

<PAGE>   1

                                  EXHIBIT 10.18

                                       IXC

                            MASTER SERVICE AGREEMENT

This Agreement for telecommunications services is made as of the date of last
execution below (the "Effective Date") and entered into by and between IXC
Carrier, Inc./ IXC Long Distance, Inc./ IXC Broadband Services, Inc.
(generically "IXC"), a Nevada/Delaware corporation with its principal place of
business at 5000 Plaza on the Lake, Suite 200, Austin, Texas 78746 ("Supplier"),
and Universal Access, Inc., an Illinois corporation with its principal place of
business at 1021 West Adams Street, Suite 101, Chicago, Illinois 60607
("Customer").

WHEREAS, Customer desires to obtain telecommunications services as described
below (the "Service") from Supplier, and Supplier is willing to provide the
Service for the rates attached hereto.

NOW, THEREFORE, Customer and Supplier hereby mutually agree as follows:

CREDIT REQUIREMENTS: Deposit. Customer shall pay Supplier in advance a deposit
equal to the monthly recurring charges plus installation for each circuit
ordered with Supplier hereunder.

SERVICE, TERM AND RATES: Supplier agrees to provide and Customer agrees to
purchase Service(s) indicated below. This agreement, including any terms and
conditions, addenda, schedules, supplements or exhibits which are attached
hereto and incorporated herein, constitutes the entire agreement (the
"Agreement") by Supplier and Customer pertaining to the subject matter(s) hereof
and supersedes all prior and contemporaneous agreements and understandings in
connection herewith.

SERVICE TYPE:

<TABLE>
<CAPTION>
            SWITCHED SERVICE:          BROADBAND SERVICE:
            -----------------          ------------------
<S>                                    <C>
            _______ Xclusive           ___________ ATM
            _______ Xnet               ___________ Frame Relay
            PRIVATE LINE SERVICE:      ___________ Network Management Services
              X       Digital          ___________ Training

            _________ Optical          CUSTOMER INTERFACE:

                                       ___________ Rack Space & Power
                                       ___________ Shelf Space
                                       ___________ Collocation
</TABLE>

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date last
written below.

IXC                                     UNIVERSAL ACCESS, INC.

BY: /s/ JOHN R. FLEMING                 BY: /s/ PATRICK C. SHUTT
-----------------------------------     ----------------------------------------

NAME: JOHN R. FLEMING                   NAME: PATRICK C. SHUTT

TITLE: EXECUTIVE VICE-PRESIDENT         TITLE: PRESIDENT
      -----------------------------           ----------------------------------

DATE: 11/6/97                           DATE: 10/27/97
     ------------------------------          -----------------------------------

FULL BUSINESS ADDRESS:                  FULL BUSINESS ADDRESS:
5000 PLAZA ON THE LAKE, SUITE 200       1021 WEST ADAMS STREET, SUITE 101
AUSTIN, TEXAS 78746-1050                CHICAGO, ILLINOIS 60607
TELEPHONE: 512-427-3700                 TELEPHONE: 312-706-7500
FACSIMILE: 512-328-7902                 FACSIMILE: 312-706-9006
                                        BILLING CONTACT: MARIA CAVAZOS

                                        TELEPHONE: 312-491-1700

        APPROVED AS TO FORM

            LEGAL DEPT.

<PAGE>   2

                            MASTER SERVICE AGREEMENT
                               TERMS & CONDITIONS

1.      CREDIT. All Services ordered hereunder are subject to credit approval.
        Customer shall complete a credit application form attached hereto as
        Exhibit A.

2.      PROVISION OF BALANCE SHEET. Prior to commencement of Service, Customer
        shall provide Supplier with financial statements including a
        consolidated balance sheet of Customer as of the end of the most recent
        quarter and consolidated statements of income and retained earnings of
        such quarter and the fiscal year to date through such quarter, all in
        reasonable detail and certified by Customer's chief financial officer as
        having been prepared in accordance with generally accepted accounting
        principles, consistently applied. Customer shall provide updated
        financial statements as reasonably requested by Supplier.

3.      PAYMENT TERMS. Invoices for Service are due and payable within thirty
        (30) days of the date of invoice (unless otherwise indicated in the
        Credit Requirements section of the Master Service Agreement), without
        demand or set off by Customer. Payments not received within thirty (30)
        days of the date of invoice are considered past due. In addition to
        Supplier undertaking any of the actions set forth in this Agreement, if
        any invoice is not paid when due: (i) a late charge shall accrue equal
        to 1-1/2% (or the maximum legal rate, if less) of the unpaid balance per
        month; (ii) Supplier may require a Security Deposit or other forms of
        security acceptable to Supplier; and/or (iii) Supplier may take any
        action in connection with any other right or remedy Supplier may have
        under this Agreement in law or in equity.

4.      BILLING DISPUTES. If Customer in good faith disputes any portion of any
        Supplier invoice, Customer shall submit to Supplier, within 30 days
        following the date of the invoice, full payment of the undisputed
        portion of the invoice and written documentation identifying and
        substantiating the disputed amount. If Customer does not report a
        dispute within the 30 day period, Customer shall have waived its dispute
        rights for that invoice. Supplier and Customer agree to use their
        respective best efforts to resolve any dispute within fifteen (15) days
        after Supplier receives written notice of the dispute from Customer. Any
        disputed amounts resolved in favor of Customer shall be credited to
        Customer's account on the next invoice following resolution of the
        dispute. Any disputed amounts determined to be payable to Supplier shall
        be due within ten (10) days of the resolution of the dispute.

        Any dispute arising out of or relating to this Agreement which has not
        been resolved by the good faith efforts of the parties will be settled
        by binding arbitration conducted expeditiously in accordance with
        Section 16.

5.      ADDITIONAL ASSURANCES. If at any time during the term of this Agreement
        there is a material and adverse change in Customer's financial condition
        or business prospects, which shall be determined by Supplier in its sole
        and absolute discretion, then Supplier may demand that Customer deposit
        with Supplier a security deposit (the "Security Deposit"), pursuant to
        Supplier's standard terms and conditions, as security for the full and
        faithful performance of Customer of the terms, conditions and covenants
        of this Agreement; provided, however, that in no event shall the amount
        of the Security Deposit ever exceed two months' estimated Usage Charges
        and other amounts payable by Customer to Supplier hereunder.

6.      SUBJECT TO LAWS. Customer hereby represents and warrants that it is
        certified to do business in all jurisdictions in which it conducts
        business and is in good standing in all such jurisdictions. Customer
        further represents and warrants that it is certified by the proper
        regulatory agencies to provide interstate, intrastate and international
        long distance services to End-Users in those jurisdictions where such
        services are to be provided by Customer. Customer shall keep current
        during the term of this Agreement, copies of its Certificates of Public
        Convenience and Necessity or similar documents certifying Customer's
        interstate, intrastate, or international operating authority in any
        local, state, or federal jurisdiction (collectively, "Service Compliance
        Certificates") and furnish copies thereof to Supplier within ten days of
        written request by Supplier. Supplier reserves the right to refuse or
        withhold Service in any jurisdiction in which Customer's Service
        Compliance Certificate has not been furnished to Supplier in a timely
        manner. Customer shall defend and indemnify Supplier from any losses,
        expenses, demands and claims in connection with Customer's failure to
        provide Supplier with such Service Compliance Certificates. Such
        indemnification includes costs and expenses (including reasonable
        attorney's fees) incurred by Supplier in settling, defending or
        appealing any claims or actions brought against it relating to
        Customer's failure to provide such Service Compliance Certificates.

7.      GOVERNING LAW. This Agreement shall be construed and enforced in
        accordance with, and the validity and performance hereof, shall be
        governed by the laws of the State of Texas without regard to its
        principles of choice of law.

8.      NOTICES. All notices and other communications hereunder shall be in
        writing and shall be deemed to have been duly given as of the date of
        delivery, facsimile transmission or mailing, and if mailed, first class
        postage prepaid, certified or registered mail, return receipt requested
        to the following persons, unless contrary instructions are given by the
        parties in writing:

        If to Supplier: IXC
                        5000 Plaza on the Lake, Suite 200
                        Austin, Texas 78746
                        Attention: Contract Administration

        If to Customer: Universal Access, Inc.
                        1021 West Adams Street, Suite 101
                        Chicago, Illinois 60607

                                       1
<PAGE>   3

9.      WAIVER OF BREACH OR VIOLATION NOT DEEMED CONTINUING. The waiver by
        either party of a breach or violation of any provision of this Agreement
        shall not operate as or be construed to be a waiver of any subsequent
        breach hereof.

10.     BANKRUPTCY. In the event of the bankruptcy or insolvency of either party
        hereto or if either party hereto shall make an assignment for the
        benefit of creditors or take advantage of any act or law for relief of
        debtors, the other party to this Agreement shall have the right to
        terminate this Agreement without further obligation or liability on its
        part.

11.     BUSINESS RELATIONSHIP. This Agreement shall not create any agency,
        employment, joint venture, partnership, representation, or fiduciary
        relationship between the parties. Neither party shall have the authority
        to, nor shall any party attempt to, create any obligation on behalf of
        the other party.

12.     INDEMNITY.

        A.      Each party shall indemnify, defend, release and hold harmless
        the other party and all of its officers, agents, directors,
        shareholders, subcontractors, subsidiaries, employees and other
        affiliates (collectively "Affiliates") from and against any action,
        claim, court cost, damage, demand, expense, liability, loss, penalty,
        proceeding or suit, (collectively, together with related attorneys'
        fees; including costs and disbursements, "Claims") imposed upon either
        party by reason of damages to property or injuries, including death, as
        a result of an intentional or a negligent act or omission on the part of
        the indemnifying party or any of its Affiliates in connection with: (i)
        the performance of this Agreement; or (ii) other activities relating to
        the property or facilities which are the subject of this Agreement,
        whether or not the Claims result from a sole negligent act or omission
        on the part of the indemnifying party, whether the Claims result from
        the concurrent negligent act or omission on the part of both parties, or
        whether the Claims result from the negligent act or omission of the
        indemnifying party and some other third party. In the event a Claim
        relates to the negligence of both parties, the relative burden of the
        Claim shall be attributed equitably between the parties in accordance
        with the principles of comparative negligence.

        B.      In the event any action shall be brought against the indemnified
        party, such party shall immediately notify the indemnifying party in
        writing, and the indemnifying party, upon the request of the indemnified
        party, shall assume the defense thereof on behalf of the indemnified
        party and its Affiliates and shall pay all expenses and satisfy all
        judgments which may be incurred by or rendered against the indemnified
        party or its Affiliates in connection therewith, provided that the
        indemnified party shall not be liable for any settlement of any such
        action effected without its written consent.

        C.      Notwithstanding the termination of this Agreement for any
        reason, this Section 12 shall survive such termination.

13.     INSURANCE. Throughout the term of this Agreement and any extension
        thereof, each party shall maintain and, upon written request, shall
        provide to the other proof of adequate liability insurance:

        (i)     Worker's compensation insurance up to the amount of the
        statutory limit in the state or states where work is to be performed;

        (ii)    Employer's liability insurance with a limit of not less than
        $200,000 per claim with an all-states endorsement;

        (iii)   Comprehensive general liability insurance with a limit of not
        less than $1,000,000 per occurrence for bodily injury liability and
        property damage liability, including coverage extensions for blanket
        contractual liability, personal injury liability and products and
        completed operations liability; and

        (iv)    Comprehensive Auto Liability insurance with a limit of not less
        than $1,000,000 per accident for Bodily Injury Liability and Property
        Damage Liability arising out of the ownership, maintenance or use of any
        vehicle in the performance of this Agreement.

14.     AUTHORIZED USE OF SUPPLIER NAME. Without Supplier's prior written
        consent, Customer shall not: (i) refer to itself as an authorized
        representative of Supplier in promotional, advertising or other
        materials; or (ii) use Supplier's logos, trade marks, service marks, or
        any variations thereof in any of its promotional, advertising or other
        materials or in any activity using or displaying Supplier's name or the
        Services to be provided by Supplier. Customer agrees to change or
        correct, at Customer's expense, any such material or activity which
        Supplier, in its sole judgment, determines to be inaccurate, misleading
        or otherwise objectionable in relation to using or marketing Supplier's
        services. Customer is explicitly authorized to only use the following
        statements in its sales literature: (i) "Customer utilizes the
        Supplier's network"; (ii) "Customer utilizes Supplier's facilities";
        (iii) "Supplier provides only the network facilities"; and (iv)
        "Supplier is our network services provider".

15.     ASSIGNMENT. Neither party hereto may assign this Agreement without the
        express written consent of the other party hereto, which consent shall
        not be unreasonably withheld. Notwithstanding the foregoing: (i) a
        security interest in this Agreement may be granted by Supplier to any
        lender to secure borrowings by Supplier or any of its affiliates; (ii)
        Supplier may assign all its rights and obligations hereunder to any
        Affiliate; and (iii) any subsidiary of Supplier may assign any amounts
        due from Customer under any Supplement to Supplier for billing purposes.

16.     BINDING ARBITRATION. The parties will attempt in good faith to resolve
        any controversy or claim arising out of or relating to this Agreement
        promptly through discussions between themselves at the operational
        level. In the event a resolution cannot be reached, such controversy or
        claim shall be negotiated between appointed counsel or senior executives
        of the parties who have authority to settle the controversy.

        The disputing party shall give the other party written notice of the
        dispute. If the parties fail to resolve such controversy or claim within
        thirty days of the disputing party's notice, either party may seek
        arbitration as set forth below.

                                        2

<PAGE>   4

        Any controversy or claim arising out of or relating to this Agreement,
        or a breach of this Agreement, shall be finally settled by arbitration
        in Austin, Texas and shall be resolved under the laws of the State of
        Texas. The arbitration shall be conducted before a single arbitrator in
        accordance with the commercial rules and practices of the American
        Arbitration Association then in effect.

        The arbitrator shall have the power to order specific performance if
        requested. Any award, order, or judgment pursuant to such arbitration
        shall be deemed final and binding and may be enforced in any court of
        competent jurisdiction. The parties agree that the arbitrator shall have
        no power or authority to make awards or issue orders of any kind except
        as expressly permitted by this Agreement, and in no event shall the
        arbitrator have the authority to make any award that provides for
        punitive or exemplary damages. All such arbitration proceedings shall be
        conducted on a confidential basis. The arbitrator may, as part of the
        arbitration award, permit the substantially prevailing party to recover
        all or part of its attorney's fees and other out-of-pocket costs
        incurred in connection with such arbitration. Customer may, at its
        option, continue to accept what it considers to be below-standard
        Services and pay the charges hereunder relating thereto during such
        pendency of such arbitration, without prejudice thereto.

17.     LEGAL CONSTRUCTION. In the event one or more of the provisions contained
        in this Agreement shall, for any reason be held to be invalid, illegal,
        or unenforceable in any respect, such invalidity, illegality or
        unenforceability shall not affect any other provision hereof, and this
        Agreement shall be construed as if such invalid, illegal or
        unenforceable provision had never been contained herein.

18.     NO PERSONAL LIABILITY. Each action or claim of any party arising under
        or relating to this Agreement shall be made only against the other party
        as a corporation, and any liability relating thereto shall be
        enforceable only against the corporate assets of such party. No party
        shall seek to pierce the corporate veil or otherwise seek to impose any
        liability relating to, or arising from, this Agreement against any
        shareholder, employee, officer or director of the other party. Each of
        such persons is an intended beneficiary of the mutual promises set forth
        in this Section and shall be entitled to enforce the obligations of this
        Section.

19.     NOTICE OF BREACH OF AGREEMENT. To be effective, written notice of any
        material breach (except Payment Default) must prominently contain the
        following sentences in capital letters: "THIS IS FORMAL NOTICE OF A
        BREACH OF CONTRACT. FAILURE TO CURE SUCH BREACH WILL HAVE SIGNIFICANT
        LEGAL CONSEQUENCES."

20.     LIMITATION OF LIABILITY. Supplier's liability arising out of delays in
        restoration of the Services to be provided under this Agreement or out
        of mistakes, accidents, omissions, interruptions, or errors or defects
        in transmission in the provision of Services or any other
        telecommunications services, shall be subject to the limitations set
        forth above and in the applicable Tariff. IN NO EVENT SHALL SUPPLIER BE
        LIABLE TO CUSTOMER OR ANY OF THE CUSTOMER'S OWN CUSTOMERS OR ANY OTHER
        THIRD PARTY IN ANY RESPECT, INCLUDING, WITHOUT LIMITATION, FOR ANY
        DAMAGES, EITHER DIRECT, INDIRECT, CONSEQUENTIAL, SPECIAL, INCIDENTAL,
        ACTUAL, PUNITIVE, OR ANY OTHER DAMAGES, OR FOR ANY LOST PROFITS OF ANY
        KIND OR NATURE WHATSOEVER, ARISING OUT OF MISTAKES, ACCIDENTS, ERRORS,
        OMISSIONS, INTERRUPTIONS, OR DEFECTS IN TRANSMISSION, OR DELAYS,
        INCLUDING THOSE WHICH MAY BE CAUSED BY REGULATORY OR JUDICIAL
        AUTHORITIES, ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE
        OBLIGATIONS OF SUPPLIER PURSUANT TO THIS AGREEMENT; AND IN NO EVENT
        SHALL SUPPLIER BE LIABLE AT ANY TIME FOR ANY AMOUNT IN EXCESS OF THE
        AGGREGATE AMOUNT IT HAS PRIOR TO SUCH TIME COLLECTED FROM CUSTOMER WITH
        RESPECT TO SERVICES DELIVERED HEREUNDER. SUPPLIER MAKES NO WARRANTY TO
        CUSTOMER OR ANY OTHER PERSON OR ENTITY, WHETHER EXPRESS, IMPLIED, OR
        STATUTORY, AS TO THE DESCRIPTION, QUALITY, MERCHANTABILITY, COMPLETENESS
        OR FITNESS FOR ANY PURPOSE OF ANY SERVICE PROVIDED HEREUNDER OR
        DESCRIBED HEREIN, OR AS TO ANY OTHER MATTER, ALL OF WHICH WARRANTIES BY
        SUPPLIER ARE HEREBY EXCLUDED AND DISCLAIMED. For purposes of this
        Section, the term "Supplier" shall be deemed to include Supplier, its
        shareholders, directors, officers and employees, and any person or
        entity assisting Supplier in its performance pursuant to this Agreement.

21.     SYSTEM MAINTENANCE. In the event Supplier determines to interrupt
        Services for the performance of routine system maintenance, Supplier
        will use reasonable efforts to notify Customer prior to the interruption
        and to conduct such maintenance during non-peak hours. In no event shall
        interruption for system maintenance constitute a Failure of Performance
        by Supplier.

22.     MAINTENANCE & TROUBLE REPORTING. Supplier's standard fees for Customer
        maintenance support services are as follows:

        Maintenance services shall be defined as all work performed by Supplier
        on equipment provided by or on behalf of the Customer, or supervision of
        the Customer's work within Supplier's terminal facilities. Maintenance
        Service charges are not billed for troubles found within that portion of
        a circuit provided by Supplier. The following billing rates apply for
        these services:

        A.      $75 per hour (4 hour minimum-if dispatch is required) Monday
        through Friday during the business hours of 8:00 a.m. - 5:00 p.m. local
        time, exclusive of the following holidays: New Year's Day, President's
        Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and the
        day after Thanksgiving and Christmas Day.

        B.      $95 per hour (4 hour minimum) for overtime work

                                        3

<PAGE>   5

        done after business hours (defined above) and/or on holidays (defined
        above) and/or all day on Saturdays and Sundays.

        C.      As requests for maintenance services are typically made via
        telephone, Supplier must be advised in writing as to the person(s) who
        are authorized to request service. It is the Customer's responsibility
        to keep Supplier apprised of any changes to its list of
        representative(s).

        D.      To request technical assistance and help under the maintenance
        services, a call must be made to Supplier's Network Control Center at
        1-800-526-2488. This number should be used for Supplier technical
        assistance, troubleshooting or testing of circuits, not for service
        impairment or outages. The person calling in must be on the authorized
        list in order to commit for charges for this technical assistance. If
        that person is not on the list, the request cannot be accommodated.

        The Network Control Center personnel will take the call, record the
        caller's name and phone number along with facts concerning the
        assistance and support needed. The caller will then be given the number
        of the "Assistance Ticket." Upon completion of work, this "Assistance
        Ticket" will be given to Supplier's Accounting Department, and the
        Customer will subsequently be billed based upon the information on that
        ticket. A copy will be attached to the invoice.

        Except for emergencies, Supplier's technicians cannot be dispatched
        unless requests are made in accordance with the above call-out
        procedure.

23.     SUBJECT TO LAWS. This Agreement is subject to, and Customer agrees to
        comply with, all applicable federal, state and local laws, and
        regulations, rulings and orders of governmental agencies, including, but
        not limited to, the Communications Act of 1934, the Telecommunications
        Act of 1996, the Rules and Regulations of the Federal Communications
        Commission ("FCC") and state public utility or service commissions
        ("PSC"), tariffs and the obtaining and continuance of any required
        certification, permit, license, approval or authorization of the FCC and
        PSC or any governmental body, including, but not limited to regulations
        applying to feature group termination and Letter of Agencies ("LOAs").

24.     FCC PERMITS, AUTHORIZATION AND FILINGS. Supplier shall take all
        necessary and appropriate steps, as soon as possible, to procure from
        the FCC the necessary authorizations, if any, to deliver Services
        hereunder to Customer and whatever approvals are necessary from any
        other federal or state agency. In the event that Supplier cannot obtain
        all necessary federal, state or local authority to provide Services
        hereunder, Supplier shall promptly give written notice thereof to
        Customer, and such notice shall constitute termination without liability
        of either party hereto of all obligations hereunder.

25.     COUNTERPARTS. This Agreement may be executed in any number of
        counterparts, each of which shall be deemed an original, and when taken
        together shall constitute one document.

26.     CONFIDENTIAL INFORMATION AND NONSOLICITATION. "Confidential Information"
        shall mean all information disclosed in writing by one party to the
        other party which is clearly marked "CONFIDENTIAL" by the disclosing
        party at the time of disclosure. "Confidential Information" shall also
        include certain oral information disclosed by one party to the other
        party, provided that the disclosing party designates such information as
        confidential at the time of disclosure and gives recipient a written
        summary of such information within five business days after the oral
        disclosure was made. Notwithstanding the foregoing, all information
        concerning the traffic volume/distribution of Supplier, pricing rates,
        and customer lists is hereby deemed to be Confidential Information
        regardless of whether it is so identified. The term "Confidential
        Information" does not include any information which: (i) was already
        known by the receiving party free of any obligation to keep it
        confidential at the time of its disclosure by the disclosing party, (ii)
        becomes publicly known through no wrongful act of the receiving party,
        (iii) is rightfully received from a third person without knowledge of
        any confidentiality obligation, (iv) is independently acquired or
        developed without violating any of the obligations under this Agreement,
        (v) is disclosed to a third person by the disclosing party without
        similar confidentiality restrictions on such third persons rights, or
        (vi) is approved for release by written authorization of the disclosing
        party.

        Further, the recipient may disclose Confidential Information pursuant to
        any judicial or governmental request, requirement or order. The
        recipient, however, shall take reasonable steps to give the disclosing
        party sufficient prior notice to contest such request, requirement or
        order. Confidential Information shall remain the property of the
        disclosing party, and shall be returned to the disclosing party or
        destroyed upon request of the disclosing party. Supplier may make such
        Confidential Information available to its lenders.

        Accordingly, in the event of a breach or threatened breach of the
        foregoing provisions, Supplier shall be entitled to an injunction or
        restraining order, in addition to such other rights or remedies as may
        be available under this Agreement, at law or in equity, including but
        not limited to money damages.

27.     FORCE MAJEURE. Supplier shall not be liable for any failure of
        performance hereunder due to causes beyond its reasonable control,
        including, but not limited to: acts of God, fire, explosion, vandalism,
        cable cut, storm or other similar catastrophes; any law, order,
        regulation, direction, action or request of the United States
        government, or of any other government, including state and local
        governments having jurisdiction over either of the parties, 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; national emergencies; insurrections; riots; wars;
        or strikes, lock outs, work stoppages or other labor difficulties.

28.     SURVIVAL. The covenants and agreements of Customer contained in this
        Agreement with respect to payment of amounts due, confidentiality and
        indemnification shall

                                        4

<PAGE>   6

        survive any termination of this Agreement. The rights and obligations
        under this Agreement shall survive any merger or sale of either party
        and shall be binding upon the successors and permitted assigns of each
        party.

29.     REGULATORY. Customer is responsible for payment of, or reimbursement to
        Supplier for, Universal Service Fund and Lifeline Assistance Charges
        (Presubscribed line charges) set forth in the National Exchange Carrier
        Association (NECA) Tariff FCC #5, sections 8.5., 8.5.2 and 17.1.4 (A) &
        (B), as the same may be amended from time to time, or any successor
        tariffs or sections, with respect to any Customer ANI's subscribed to
        Supplier. In addition, with respect to the Services, Customer is
        responsible for payment of, or reimbursement to Supplier for: (i)
        telecommunication relay service charges required by the Americans with
        Disabilities Act or otherwise (both federal and state); (ii)
        interexchange carrier fees payable to the FCC under the Omnibus Budget
        Reconciliation Act of 1993 or otherwise; and (iii) universal service
        fund charges, intraLATA compensation charges and other federal or state
        fees or charges imposed on Supplier. Supplier will furnish, at
        Customer's request, documentation to support the fees or charges payable
        by Customer to Supplier pursuant to this Section 29.

        Customer shall furnish to Supplier valid and appropriate tax exemption
        certificates for all applicable jurisdictions (federal, state and local)
        in which it performs customer billing. Customer is responsible for
        properly charging tax to its subscribers and for the proper and timely
        reporting and payment of applicable taxes to the taxing authorities and
        shall defend and indemnify Supplier from payment and reporting of all
        applicable federal, state and local taxes, including, but not limited
        to, gross receipts taxes, surcharges, franchise fees, occupational,
        excise and other taxes (and penalties and interest thereon), relating to
        the Services. Such indemnification includes costs and expenses
        (including reasonable attorney's fees) incurred by Supplier in settling,
        defending or appealing any claims or actions brought against it relating
        to said taxes. If Customer fails to provide and maintain the required
        certificates, Supplier may charge Customer and Customer shall pay such
        applicable taxes.

        The amounts payable by Customer under this Agreement do not include any
        state or local sales or use taxes, or utility taxes, however designated,
        which may be levied on the goods and services provided by Supplier
        hereunder. With respect to such taxes, if applicable, Customer shall
        furnish Supplier with an appropriate exemption certificate or pay to
        Supplier, upon timely presentation of invoices therefore, such amounts
        thereof as Supplier may be by law required to collect or pay. Any and
        all other taxes, including but not limited to franchise, net or gross
        income, license, occupation, and real or personal property taxes, shall
        be timely paid by Supplier. Customer shall pay to Supplier any such
        taxes that Supplier may be required to collect or pay.

30.     OBLIGATIONS SEVERAL AND NOT JOINT. Each party shall be responsible only
        for its own performance under the Agreement (including any attachments,
        exhibits, schedules or addenda) and not for that of any other party.

31.     AMENDMENTS. This Agreement may only be modified or supplemented by an
        instrument in writing executed by each party.

                                        5

<PAGE>   7

                         PRIVATE LINE SERVICE SUPPLEMENT
                                 DIGITAL SERVICE

1.      SCOPE AND RATES. Supplier shall use its best efforts (considering the
        needs of its other customers) to provide Service for which a Purchase
        Order has been accepted. A form of Purchase Order is attached hereto as
        Exhibit A. The rates for Service are set forth in Exhibit D, unless
        otherwise specified in the applicable Purchase Order. Such rates are
        valid for the term of this Agreement. Supplier may thereafter change
        such rates, but not for any Circuit then in service. Customer may also
        order the services listed in Exhibit B, subject to availability.

2.      TERM. The Agreement is for a term of three (3) years commencing on the
        Effective Date and shall continue through the end of the Circuit Lease
        Term which is last to expire. If Service continues after such Circuit
        Lease Term, the applicable rates will be equal to 120% of the rates
        hereunder and Service may be terminated by either party upon 30 days'
        notice.

3.      INVOICE. Customer will be invoiced monthly for: (i) the monthly lease
        rate (prorated for any partial month) for each Available Circuit; and
        (ii) the charges for other services received. The first invoice shall be
        for the first two months; each invoice thereafter shall be for the
        following month.

4.      TERMINATION. Customer may terminate any Circuit upon 90 days' notice;
        provided that if termination occurs: (i) prior to the Activation Date,
        Customer shall reimburse Supplier for all costs of the implementation of
        such Circuit; or (ii) on or after such date Customer shall pay: (A) all
        charges for Service previously rendered; and (B) the amount due through
        the end of the applicable Circuit Lease Term (Supplier shall try to
        re-lease such Circuit for such term, refunding to Customer the amount so
        collected, if any). If Supplier: (i) fails to provide Service within six
        months of the Requested Service Date; or (ii) fails to cure a material
        breach hereof within 45 days of notice from Customer, Customer may, as
        its only remedy, terminate the affected Circuit.

5.      OUTAGE CREDITS. Supplier shall give Customer a credit in accordance with
        its then-current outage policy for periods in which any Circuit loses
        continuity and fails to comply with applicable specifications. Such
        credit shall be Customer's sole remedy with respect to such an event;
        provided, however, that no such credits shall be allowed and Supplier
        shall not be liable for any Service defect from causes outside its
        control, including accidents, cable cuts, fires, floods, emergencies,
        government regulation, wars, or acts of God. SUPPLIER DISCLAIMS ALL
        EXPRESS AND IMPLIED WARRANTIES RELATING TO SERVICE, INCLUDING BUT NOT
        LIMITED TO, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR
        PURPOSE. CUSTOMER HAS NOT RELIED ON ANY REPRESENTATION NOT SET FORTH
        HEREIN. CUSTOMER SHALL INDEMNIFY SUPPLIER FROM ANY CLAIMS MADE BY ANY
        CUSTOMER OF CUSTOMER.

6.      DEFINITIONS. For purposes hereof: "Available" means all necessary
        Supplier equipment for a Circuit has been installed. "Activation Date"
        means the date a Circuit is first made Available to Customer. "Circuit"
        means a DS-O, DS-1 or a DS-3. "Circuit Lease Term" means the term of a
        Circuit specified in the applicable Purchase Order. "Circuit Mileage"
        means the length of a Circuit specified in the applicable Purchase
        Order. "DS-0" means a circuit complying with TR-TSY-000333 "Switched and
        Special Access Services - Transmission Parameter Limits and Interface
        Combinations" Issue 1, July 1990. "DS-1" means a circuit complying with
        AT&T Tech. Ref. Pub. 62411, December 1990,with Addendum 1, March 1991,
        and Bellcore TR-NWT-000499, Issue 5, December 1993. "DS-3" means a
        circuit meeting the specifications set forth in AT&T Technical Reference
        Pub. 54014 Addendum 1, November 1992 and Bellcore TR-NWT-000499, Issue
        5, December 1993. "Purchase Order" means any Customer purchase order
        accepted by Supplier. "Requested Service Date" means the date Service on
        a Circuit is requested to commence specified in the applicable Purchase
        Order. "Service" means transmission service provided between North
        American DSX standard cross-connect panels located in Supplier's
        terminal locations.

                                        1

<PAGE>   8

                                    EXHIBIT A

Req'st Svc Date:________          IXC - PRIVATE LINE           OFFICE USE ONLY
Accepted Earlier Activation:  MARKET SERVICE ORDER (MSO)     MSO #______________

Y______N_______

CKT ID:_____________                                    RELATED MSO:____________

              PURCHASE ORDER FORM FOR CUSTOMER ORDER NO:__________

Pursuant to the MASTER SERVICE AGREEMENT by and between IXC as Supplier and
__________________________ as Customer, dated______________, 19___, Customer
orders and Supplier shall provide the following Digital Transmission Service:

<TABLE>
<CAPTION>
                                                       QTY         RATE       TERM     MILES
<S>                   <C>                          <C>             <C>        <C>      <C>
New     ________      Renew      __________
Cancel  ________      Disconnect __________        DS-3   _____    _____      _____    _____
Change  ________      Expedite   Y____ N___        DS-1   _____    _____      _____    _____
On Net  ________      Off Net    __________        DS0    _____    _____      _____    _____
Protocol________      Reconfigure__________        CIF    _____    _____      _____    _____
Other   ________________________________           Other  _____    _____      _____    _____

Customer Contact:____________________              Phone #: ________________       Fax # _______________
Technical Contact____________________              Phone #: ________________       Fax # _______________
CITY LOCATION A: ____________________              CITY LOCATION B:_________________________________

Special____________       Switched____________     Special________________      Switched________________
Bypass Y_____N_____       Owner   ____________     Bypass Y_______N_______      Owner   ________________

LESSOR TO PROVIDE            CFA: Y_____N_____     LESSOR TO PROVIDE:        CFA: Y_____N_____
LOA: Y_____N_____            ASR: Y_____N_____     LOA: Y_____N_____         ASR: Y_____N_____

CUSTOMER (LESSEE) TO PROVIDE:                      CUSTOMER (LESSEE) TO PROVIDE:
LOA: Y___N___ Coordinated Convert Y___N___         LOA: Y___N___ Coordinated Convert Y___N____
CIF Arrangement Y___N___ CIF Attach Y___N___       CIF Arrangement Y___N___ CIF Attach ___N___
Special Instructions________________________       Special Instructions_________________________
</TABLE>

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------
MONTHLY LEASE RATE:                     NON RECURRING CHARGES:
<S>                                     <C>
Monthly IXC Change: $__________         Installation $__________ ASR:     $_____
Eqpt. Lease Charge: $__________         Installation $__________ Reconfig $_____
Echo Canceller:     $__________         Installation $__________ Expedite $_____
CIF Racks:          $__________         Installation $__________
CIF Power:          $__________         Installation $__________
Other               $__________         Installation $__________
TOTAL:              $__________         TOTAL OF NON RECURRING CHARGES:   $_____
</TABLE>

Notwithstanding anything in the Master Service Agreement to the contrary, (1) a
security interest in this Agreement may be granted by Supplier to a Lender (2)
Supplier may from time to time assign all its rights and obligations hereunder
with respect any Circuits to any Affiliate. Upon such assignment herein this
Agreement shall be deemed to be multiple agreements, each upon the terms and
conditions set forth herein by and between Customer and such affiliate with
respect to such circuit between Supplier and Customer with respect to the
circuit not so assigned.

IN WITNESS WHEREOF, the parties have executed this PURCHASE ORDER on the
_____day of_____ 19______

------------------------------------    ---------------------------------------
SUPPLIER APPROVAL/TITLE                 CUSTOMER AUTHORIZED REPRESENTATIVE/
(Service Provider)                      TITLE (CUSTOMER)

        PLEASE FAX THIS DOCUMENT TO CUSTOMER SERVICE FAX # (512) 433-7810
FOR OFFICE USE ONLY VERSION 3.0 10/2/97

                          PRIVATE LINE EXHIBIT - PAGE 1

<PAGE>   9

EXHIBIT B - PRIVATE LINE SERVICE ANCILLARY PRICING

<TABLE>
<CAPTION>
NON-RECURRING CHARGES                              DS-0          DS-1           DS-3
---------------------                              ----          ----           ----
<S>                                                <C>           <C>            <C>
New Order Installation                             [***]         [***]          [***]
Order Change                                                     [***]          [***]
Order Cancellation (prior to activation)           [***]         [***]          [***]
ASR (new or disconnect) Special Access                           [***]          [***]
ASR Supplement                                                   [***]          [***]
Order Expedite                                     [***]         [***]          [***]
Reconfiguration                                    [***]         [***]          [***]
DACS Charge (switching only)                       [***]
DACS Port Charge (Bell access to DACS)             [***]
DS-1 DACS Port                                     [***]
</TABLE>

<TABLE>
<CAPTION>
OTHER CHARGES                                                           MONTHLY RECURRING     NON-RECURRING
-------------                                                           -----------------     -------------
<S>                                                                     <C>                   <C>
Cross-Connect Charge (Other Interexchange carrier, local
access or customer interconnect/collocation facility to
Supplier local access or bypass facility within the same
Supplier POP):

               DS-1                                                           [***]               [***]
               DS-3                                                           [***]               [***]
               OC-3*                                                          [***]               [***]
               OC-12*                                                         [***]               [***]
               OC-48*                                                         [***]               [***]

Interconnect Charge (Supplier POP to Supplier POP in the
same city or local area using Supplier owned or leased
transmission systems, with no Supplier long haul attached at
either Supplier POP):

               DS-1                                                           [***]               [***]
               DS-3                                                           [***]               [***]
               OC-3*                                                          [***]               [***]
               OC-12*                                                         [***]               [***]
               OC-48*                                                         [***]               [***]

M1/3 -  1 Year Term                                                           [***]
        2 Year Term                                                           [***]
        3 Year Term                                                           [***]

Echo Canceller (per circuit end)                                              [***]               [***]
Second End Loop (Ex: for ADPCM)                                               [***]               [***]

Rack Space                                                                    I.C.B - Subject to Availability
Shelf Space                                                                   [***]/ea/mo.             I.C.B.
DC Power                                                         [***]/amp/mo (5 amp minimum; 5 amp increments)
</TABLE>

NOTES:

1.      ALL CHARGES INCURRED BY SUPPLIER ON CUSTOMER'S BEHALF FROM ANY LOCAL
        EXCHANGE CARRIER, COMPETITIVE ACCESS PROVIDER OR COMPETITIVE LOCAL
        EXCHANGE CARRIER WILL BE DIRECTLY PASSED ON TO THE CUSTOMER.

2.      SERVICES NOT DESCRIBED ABOVE WILL BE CONSIDERED SPECIAL HANDLING AND
        CHARGES WILL BE ASSESSED ON AN INDIVIDUAL CASE BASIS (ICB).

3.      ALL OF THE ABOVE CHARGES ARE SUBJECT TO CHANGE WITH A 30-DAY NOTICE.

4.      ALL PRIVATE LINE ANCILLARY SERVICE CHARGES TO CITIES NOT LISTED ON
        EXHIBIT C WILL BE PRICED ON AN INDIVIDUAL CASE BASIS AND WILL BE SUBJECT
        TO THE TERMS AND CHARGES OF THE UNDERLYING CARRIER.

*All OC product cross-connects and interconnects will be provided based upon
availability. OC interconnects shall have a minimum term of 12 months.

*** 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.

                          PRIVATE LINE EXHIBIT - PAGE 2

<PAGE>   10

EXHIBIT C - ON-NET CITY LISTING

<TABLE>
<CAPTION>
LOCATION                 LATA         ADDRESS/(NPA)NXX
--------                 ----         ----------------
<S>                      <C>          <C>
Abilene, TX              550          1049 N. Third, #500,
                                      (915)675
Akron, OH                325          1 Cascade Plaza, Suite 1950,
                                      Main & Bowery, (216)535
Albuquerque, NM          664          200 Lomas Blvd., N.W.,
                                      13th Floor, (505)247
Amarillo, TX             546          Amarillo Petroleum Bldg.,
                                      203 W. 8th, Suite 607/608
                                      (806)373
Ann Arbor, MI            346          1615 Plymouth Rd, (313)994
Austin, TX               558          621 Pleasant Valley Road
                                      (512)389
Bakersfield, CA          734          1430 Truxton Ave., Suite 730
                                      (805)327
Baltimore, MD            238          1220 S. Howard (301)752
Battle Creek, MI         348          175 Main Street (616)962
Bay City, MI             344          100 E. Hart (517)667
Chicago, IL              358          Prudential Bldg., Suite 4001
                                      130 E. Randolph, (312)861
Cincinnati, OH           922          2300 Carew Tower, #4701
                                      441 Vine Street, (513)651
Cleveland, OH            320          R.F. Keith Bldg., Suite 2117
                                      1621 Euclid Ave., (216)771
Columbus, OH             324          Borden Bldg., Leval 2B
                                      180 E. Broad St., (614)469
Colorado Springs, CO     658          102 S. Tejon, # 780, (719)471
Corpus Christi, TX       564          606 N. Carancahua, Suite 816
                                      (512)882
Dallas, TX               552          2223 Houston Street, (214)969
Dallas, TX               552          Tower of the Americas, #380
                                      2323 Bryan, (214)954
Dayton, OH               328          1 Nat'l Bank Bldg., Ste. 2220
                                      130 W. Second, (513)461
Denver, CO               656          Bell Building, 931 14th Street,
                                      Suite 622, (303)572
Detroit, MI              340          1860 Gratio Avenue, (313)259
Detroit, MI              340          Book Bldg., Suite 2609
                                      1249 Washington (313)961
El Paso, TX              540          El Paso Natl Bank Bldg.
                                      201 E. Main, #1702, (915)533
Flint, MI                340          2001 S. Grand Traverse
                                      (313)767
Fresno Term, CA          728          Guarantee Savings, #1201
                                      B1171 Fulton Mall, (209)268
Fresno, CA               728          4605 E. Vine, (209)486
Ft. Worth, TX            552          WT Waggoner Bldg.,
                                      810 Houston,
                                      Suite 1705, (817)870
Grand Rapids, MI         348          209 Graham, S.W., (616)235
Harlingen, TX            568          513 E. Jackson, Matz Bldg.,
                                      (210)425
Houston, TX              560          293 N. Main Street, (713)224
Indianapolis, IN         336          Merchants Bank Bldg.,
                                      11 S. Meridian, #1798/1799
                                      (317)637
Jackson, MI              346          170 W. North Street,
                                      (517)783
Kalamazoo, MI            348          303 Mill Street, (616)385
Kansas City, MO          524          Bank of Kansas City, # 1704
                                      1125 Grand Ave., (816)283
Lansing, MI                           346
Las Vegas, NV            821          125 S. Las Vegas
                                      Suite 400, (702)388
Los Angeles, CA          730          One Wilshire, 624 S. Grand
                                      Suite 1615, (213)689
Lubbock, TX              544          1220 Broadway, Ste. 1901,
                                      (806)762
McAllen, TX              568          200 S. 10th Street, Ste. 704,
                                      (210)687
Midland, MI              344          1000 Jefferson, (517)631
Midland, TX              542          KMID-TV Studio, LaForce
                                      Blvd @ Air Terminal(915)561
New York, NY             132          60 Hudson St., Ste. 206
                                      (212)285
Newark, NJ               224          744 Broad Street, 3rd Floor
                                      (201)824
Oklahoma City, OK        536          Liberty Tower, Suite 3020,
                                      100 N. Broadway, (405)232
Philadelphia, PA         228          2401 Locust St., 2nd Floor
                                      (215)564
Phoenix, AZ              666          2600 N. Central, Suite 1702
                                      Phelps-Dodge Twr, (602)279
Pittsburgh, PA           234          Oliver Bldg., 535 Smithfield
                                      Suite 2650, (412)281
Pontiac, MI              344          324 S. Saginaw, (313)338
Royal Oak, MI                         3100 W. 14 Mile Road
                                      (313)435
Saginaw, MI              344          315 Meredith, (517)771
San Angelo, TX           961          36 E. Twohig, 15th Floor
                                      (915)653
San Antonio, TX          566          660 S. Santa Rosa, (210)225
San Francisco, CA        722          Metropolitan Life Bldg.
                                      Suite 3800C
                                      425 Market St., (415)543
Southbend, IN            332          211 West Washington St.
                                      19th Floor, (219)233
St. Louis, MO            520          900 Walnut, Suite 220
                                      (314)231
Sunnyvale, CA            722          111 Uranium, (408)739
Toledo, OH               326          319 Madison Ave., Suite 2901
                                      (419)242
Tucson, AZ               668          Arizona Bank Bldg., #1610
                                      33 N. Stone, (520)792
Tulsa, OK                538          3500 S. 26th West Ave.
                                      (918)584
Waco, TX                 556          100 S. 26th Street, (817)750
Washington, D.C.         236          1828 L Street, N.W., #260
                                      (202)833
</TABLE>

                          PRIVATE LINE EXHIBIT - PAGE 3

<PAGE>   11

EXHIBIT D - PRIVATE LINE PRICING

<TABLE>
<CAPTION>
SERVICE TYPE                 MILES                        RATE/DS-0 V&H MILE
                                    RATES FOR ONE YEAR TERM
<S>                          <C>                          <C>
        DS-0                                                     I.C.B.

        DS-1                       1-200                         [***]
                                 201-500                         [***]
                               501-1,000                         [***]
                             1,001-2,000                         [***]
                             2,001+                              [***]

        DS-3                       1-200                         [***]
                                 201-500                         [***]
                               501-1,000                         [***]
                             1,001-2,000                         [***]
                             2,001+                              [***]
</TABLE>

<TABLE>
<CAPTION>
SERVICE TYPE                 MILES                        RATE/DS-0 V&H MILE
                                    RATES FOR THREE YEAR TERM
<S>                          <C>                          <C>
        DS-0                                                     I.C.B.

        DS-1                       1-200                         [***]
                                 201-500                         [***]

                               501-1,000                         [***]
                             1,001-2,000                         [***]
                             2,001+                              [***]

        DS-3                       1-200                         [***]
                                 201-500                         [***]
                               501-1,000                         [***]
                             1,001-2,000                         [***]
                             2,001+                              [***]

        Minimum Circuit Charges:      DS-0          [***]
                                      DS-1          [***]
                                      DS-3          [***]
</TABLE>

NOTES:

1.      ALL PRIVATE LINE SERVICE TO CITIES NOT LISTED ON EXHIBIT C WILL BE
        PRICED ON AN INDIVIDUAL CASE BASIS AND WILL BE SUBJECT TO THE TERMS OF
        THE UNDERLYING CARRIER.

*** 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.

                          Private Line Exhibit - Page 4

<PAGE>   12

SECTION 2. UNIFORM SALES & USE TAX CERTIFICATION FORM

Issued to: IXC, 5000 Plaza on the Lake, Suite 200, Austin, Texas 78746

Certify that Universal Access, Inc. is a registered and/or identified with the
below listed cities and/or states within which your firm would deliver purchases
to us and that any such purchases are for wholesale, resale, ingredients or
components of a new product to be resold, leased, rented or used in the normal
course of our business. We are in the business of wholesaling, retailing,
manufacturing, leasing, renting or providing non-taxable services or products.

Check applicable box: (___) Single Purchase Certificate (X) Blanket Certificate

Is engaged as a registered (where applicable): (___) Wholesaler (___) Lessor (X)
Retailer (___) Manufacturer (___) Exempt Organization Use (___)
Other (Specify)_________________

Product or service rendered by Customer: Telecommunication Services

<TABLE>
<CAPTION>
STATE          REGISTRATION OR I.D. NO.           STATE          REGISTRATION OR I.D. NO.
-----------------------------------------------------------------------------------------
<S>            <C>                                <C>            <C>
IL             36-4186543                          __________    _______________
--             ----------
----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------

----------     ---------------                    -----          -----------------
</TABLE>

I further certify that if any property so purchased tax free is used or consumed
by the firm as to make it subject to a sales or use tax we will pay the tax due
direct to the proper taxing authority when state law so provides or inform the
seller for added tax billing. This certificate shall be part of each order which
we may hereafter give to you, unless otherwise specified, and shall be valid
until cancelled by us in writing or revoked by the city or state.

Exemption Claimed: (___) Resale (___) Federal Government (___) Exempt
Organization (___) State & Local Government (___) Direct Payment Permit (___)
Other (Specify) ??

I swear and affirm that the information on this form is true and correct as to
every material matter.

<TABLE>
<S>                                    <C>                   <C>
/s/ PATRICK C. SHUTT                   President             10.28.97.
----------------------------------------------------------------------
Signature                                Title                  Date
</TABLE>

<PAGE>   13

TAXES ON TELECOMMUNICATIONS SERVICES

Please check one of the following:

        X       Telecommunications services purchased from Supplier are for
                resale purposes in the normal course of our business (or are
                subject to other tax exemptions). These services are exempt from
                federal, state and local taxes.

                IF CHECKED, COMPLETE SECTION 1 & SECTION 2 BELOW FOR THE
                APPLICABLE STATES WHERE SERVICE IS PROVIDED.

        _____   Telecommunications services purchased from Supplier are not for
                resale purposes, but are purchased for our own use. These
                services are not subject to other exemptions.

                IF CHECKED, SIGN HERE:______________________________
                DATE:_______________

SECTION 1. CERTIFICATE OF EXEMPTION FROM FEDERAL EXCISE TAXES ON COMMUNICATIONS
           SERVICES AND FACILITIES
--------------------------------------------------------------------------------

The undersigned hereby certifies that the service furnished by Supplier is
exempt from the Federal Excise Tax on Communications and Facilities imposed by
Internal Revenue Code (IRC) Section 4251 because the undersigned is exempt under
IRC Section 4253 for such reason as marked below (check one). The undersigned
agrees to notify Supplier in writing when the claimed status no longer applies.

_____   A nonprofit hospital referred to in IRC Section 170(b)(1)(A)(ii) which
        is exempt from income tax under Section 501(a).

_____   A nonprofit educational organization described in IRC Section
        (170)(b)(1)(A)(ii) which is exempt from income tax under Section 501(a).

_____   A School which is operated as an activity of an organization described
        in IRC Section 501 (c)(3) which is exempt from income tax under Section
        505(a), and operates as described in IRC Section 4253(j).

_____   The U.S. government, government of a State, political subdivision of a
        state of the District of Columbia.

_____   The American Red Cross or an international organization described in
        Internal Revenue Code Sections 7701(a)(18) and 4253(c).

_____   A news service company of the type referred to in Internal Revenue Code
        Section 4253(b).

_____   Diplomatic, consular or other officers of foreign governments
        temporarily residing in the United States who are nationals of the
        foreign country on a diplomatic mission.

_____   The service will be used exclusively in the rendering of a
        communications services upon which tax is imposed by IRC Section 4251.
        It is understood that no tax will be collected by Supplier on charges
        for said service and that it will be the responsibility of the
        undersigned to collect such tax as may be due from its customers.

_____   The service, which is defined in Section 4252(b)(2), is for use by a
        common carrier, telephone or telegraph company, or radio broadcasting
        station or network in the conduct of its business as such.

FOR THIS CERTIFICATE TO BE VALID YOU MUST CHECK ONE OF THE ABOVE BOXES, SIGN AND
DATE THE CERTIFICATE AND PROVIDE AN EFFECTIVE DATE. ANY MODIFICATIONS TO THE
ABOVE WILL RENDER THE CERTIFICATE NULL AND VOID.

THE EXEMPT STATUS OF THE UNDERSIGNED IS EFFECTIVE AS OF _____________.

Customer: Universal Access, Inc.    FEDERAL TAX I.D.36-4186543

I swear under penalty of fines, imprisonment, or both, together with cost of
prosecution that the statement contained herein are true to the best of my
knowledge.

<TABLE>
<S>                                    <C>                   <C>
/s/ PATRICK C. SHUTT                   President             10.27.97
----------------------------------------------------------------------
Signature                                Title                  Date
</TABLE><PAGE>   1

                                                                 EXHIBIT 10.18.1

                             AMENDMENT NO. 1 TO IXC
                            MASTER SERVICE AGREEMENT

This Amendment No. 1 to the Master Service Agreement is made and entered into by
and between IXC COMMUNICATIONS SERVICES, INC., (F/K/A IXC CARRIER, INC./IXC LONG
DISTANCE, INC./IXC BROADBAND SERVICES, INC.), a Delaware corporation with its
principal place of business at 1122 Capital of Texas Hwy. South, Austin, Texas
78746 ("Supplier"), and Universal Access, Inc. an Illinois corporation with its
principal place of business at 1021 West Adams Street, Suite 101, Chicago,
Illinois 60607 ("Customer").

For purposes of this Amendment, the Effective Date shall mean the first day of
the next IXC billing cycle after the date of last execution below (the
"Amendment Effective Date").

This Amendment is made with reference to the following facts:

        A.      Customer and Supplier are parties to that certain Master Service
Agreement dated as of November 06, 1997 (the "Agreement").

        B.      The parties desire to amend the Agreement pursuant to the terms
set forth below.

                               TERMS OF AMENDMENT

Accordingly, in consideration of the mutual promises set forth below, the
parties agree as follows:

                1.      Section 8 of the Master Service Agreement, Terms and
                        Conditions shall be modified as follows:

                        8.      NOTICES. All notices and other communications
                hereunder shall be in writing and shall be deemed to have been
                duly given as of the date of delivery, facsimile transmission or
                mailing, and if mailed, first class postage prepaid, certified
                or registered mail, return receipt requested to the following
                persons, unless contrary instructions are given by the parties
                in writing:

                If to Supplier:     IXC Communications Services, Inc.
                                    1122 Capital of Texas Hwy. South
                                    Austin, Texas 78746
                                    Attention: Contract Administration

                If to Customer:     Universal Access, Inc.
                                    1021 West Adams Street, Suite 101
                                    Chicago, Illinois 60607
                                    Attention:________________

                2.      Exhibit B of the Private Line Service Exhibit shall be
                        replaced by Exhibit B attached hereto.

                3.      Exhibit C of the Private Line Service Exhibit shall be
                        replaced by Exhibit C attached hereto.

                4.      Exhibit D of the Private Line Service Exhibit shall be
                        replaced by Exhibit D attached hereto.

                5.      Section 6, Definitions, shall be reinstated as follows:

                        DEFINITIONS. For purposes hereof: "Available" means all
                        necessary Supplier equipment for a Circuit has been
                        installed. "Activation Date" means the date a Circuit is
                        first made Available to Customer. "Circuit" means a
                        DS-0, DS-1, DS-3, OC-3 or a OC-12. "Circuit Lease Term"
                        means the term of a Circuit specified in the applicable
                        Purchase Order. "Circuit Mileage" means the length of a
                        Circuit specified in the applicable Purchase Order.
                        "DS-0" means a circuit complying with TR-TSY-000333
                        "Switched and Special Access Services - Transmission
                        Parameter Limits and Interface Combinations" Issue 1,
                        July 1990.

<PAGE>   2

                        A "DS-1" is a signal conforming to the requirements set
                        forth in Sections 9.3 and 10.2 of ?? TR, NWT-000499.
                        Issue 5, December, 1993. A "DS-3" is a signal conforming
                        to the requirements set forth in Section 9.6 and 10.5 of
                        ?? TR-NWT-000499, Issue 5, December, 1993. An "OC-3" is
                        a signal based on the SONET frame structure as specified
                        in Bellcore GR-253-CORE, Synchronous Optical Network
                        (SONET) Transport Systems: Common Criteria Physical
                        Layers, and ANS1 T1.105, Digital Hierarchy, Optical
                        interface Rates and Formats Specifications. An "OC-12"
                        is a signal based on the SONET ?? structure as specified
                        in Bellcore GR-253-CORE, Synchronous Optical Network
                        (SONET) Transport Systems: Common Criteria Physical
                        Layers, and ANSI T1.105, Digital Hierarchy-Optical
                        Interface Rates; and Formats Specifications. "Purchase
                        Orders" means any Customer purchase order accepted by
                        Supplier. "Requested Service Dates" means the date
                        Service on a Circuit is requested to commence specified
                        in this applicable Purchase Order. "Service" means
                        transmission service provided between North American DSX
                        standard cross-comment ?? located in Supplier's terminal
                        locations.

                6.      The following shall be added in its entirety as Section
                        7 to the Private Line Service Supplement, Digital
                        Service:

                        7.      CIRCUIT UPGRADE. Circuit Upgrade shall refer to
                        an increase in bandwidth (e.g. DS-3 to an OC-3) between
                        the same A and Z city locations. A new minimum three (3)
                        year Circuit Lease Term and all installation fees shall
                        apply for all Circuit Upgrades. Customer may roll up 28
                        individual DS-1 into a Single DS-3, 3 DS-3s into a
                        single OC-3, and 4 OC-3s into a single OC-12. Customer
                        may be upgraded at any time based upon availability as
                        long as the total revenue generated as a result of the
                        upgrade is equal to or greater than the revenue which
                        would have been paid to Supplier if such upgrade had not
                        occurred. The price of any replacement or renewal
                        Service shall be based upon the ratio set forth in
                        Exhibit D.

                7.      The following shall be added in ?? as Section 8 to the
                        Private Line Service Supplement, Digital Service:

                        8.      LATE DELIVERY. Customer shall request Services
                        by submitting to the Supplier a completed order form
                        which shall include without limitation a requested
                        service date and whether services from an underlying
                        carrier are necessary. The order form shall be the
                        Purchase Order form. In the event Supplier fails to meet
                        the mutually agreed upon Requested Service Date (as set
                        forth in IXC's confirmation letter), upon Customer's
                        written request provided in accordance with the "Notice"
                        provision of this Agreement, a late delivery credit
                        shall be allowed and calculated following the activation
                        date of the Service(s) as follows:

                                (a)     Customer shall be credited for late
                                delivery of ??-Net Service(s) which are ordered
                                in accordance with Supplier's standard
                                installation intervals to the extent that such
                                late delivery was not caused by the failure of
                                equipment or systems provided by Customer or
                                persons other than Supplier, including any
                                provider of local access service to Supplier.
                                Such credit will be calculated for each day of
                                delay at the rate of 1/30 of the Monthly Lease
                                Rate or charge applicable to the Circuit which
                                is subject to the late delivery.

                                (b)     The Monthly Lease Rates used to
                                determine any credit hereunder shall be the then
                                current Monthly Lease Rates being ??.

                                (c)     In an event shall any credit be allowed
                                hereunder (1) in excess of the then current
                                Monthly Lease Rate for the applicable Circuit or
                                (2) with respect to any Circuit for which
                                Customer (i) fails to make or (ii) is excused
                                from making any payment because of operation of
                                law or any other reason.

                                (d)     Calculations of credits shall be based
                                upon Supplier's provisioning/installation
                                records.

                                (e)     The credit provided for hereunder shall
                                be Supplier's sole liability and Customer's sole
                                remedy in the event of any late delivery of
                                Service.

                8.      The following shall be added under CREDIT REQUIREMENTS
                        of the Master Service Agreement:

                                Letter of Credit. Concurrently with the
                        execution hereof, Customer has established with Supplier
                        the sum of [***] (the "Letter of Credit"), which amount
                        is equal to the estimated Usage Charges and

*** 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>   3

                        other amounts due and payable by Customer to Supplier
                        hereunder, as security for the full and faithful
                        performance of Customer of the terms, conditions and
                        covenants of this Agreement. If at any time during the
                        term of the Agreement, Customer defaults in the payment
                        of any Usage Charges, or any other amounts payable by
                        Customer to Supplier hereunder, then Supplier may
                        appropriate and apply any portion of the Letter of
                        Credit reasonably necessary to remedy any such default.
                        If during the term of the Agreement, Supplier so applies
                        all or any portion of the Letter of Credit, then
                        Customer shall restore the amount of the Letter of
                        Credit so applied by Supplier on or before the next due
                        payment of Usage Charges under this Agreement. If,
                        however, invoices for Services during any month provided
                        by Supplier exceed one half of the Letter of Credit, at
                        the request of Supplier, Customer shall within five (5)
                        days (i) provide an additional Letter of Credit and/or a
                        cash deposit; or (ii) other form of security
                        satisfactory to Supplier which in either case, shall be
                        in an amount equal to the amount by which the invoice
                        for such month exceeds one-half of the amount of the
                        Letter of Credit held by Supplier.

                                Release of Letter of Credit. Notwithstanding
                        anything to the contrary herein at any time during the
                        term of the Agreement, Supplier shall release the Letter
                        of Credit to Customer, in consideration of Customer's
                        undertaking of any of the following actions: (i)
                        obtaining for the benefit of Supplier a cash deposit
                        securing the prompt payment, when due, of the estimated
                        Usage Charges and other amounts due and payable by
                        Customer to Supplier hereunder: (ii) (a) granting to
                        Supplier a continuing, floating, first priority security
                        interest and lien in and to the Collateral (as defined
                        below) on the terms and subject to the conditions of a
                        security agreement in form and substance reasonably
                        satisfactory to Supplier; and (iii) directing all of
                        Customer's End-Users to deposit any money owed by such
                        End-Users to Customer directly into a lockbox account at
                        Supplier's bank for the benefit of Supplier, and
                        authorize Supplier's bank to make automatic clearing
                        house fund transfers from such lockbox account to the
                        account of Supplier in amounts initially agreed to by
                        Customer and Supplier, on the terms and subject to the
                        conditions of an escrow agreement in form and substance
                        reasonably satisfactory to Supplier.

                                Customer shall execute from time to time such
                        additional instruments as may be reasonably required by
                        Supplier to preserve and perfect any security interest
                        created hereunder. For purposes of this subparagraph
                        (ii), the term "Collateral" shall mean all of the
                        following assets of Customer, now or hereafter existing,
                        wherever located, and all additions, substitutions,
                        proceeds, products, offsprings, rents and profits
                        thereof: all accounts receivable, all customer lists,
                        mailing lists, customer information and customer data
                        bases, including, without limitation, any and all
                        tangible assets embodying any or all of the foregoing
                        information, and any and all computer software or
                        printouts embodying any or all of the foregoing
                        information.

                9.      The following shall be added in its entirety as Section
                        7 of the Private Line Supplement.

                                7.      CUSTOMER DEFAULT. In the event of a
                        "Customer Default", upon notice to Customer, Supplier
                        may (in addition to such other rights or remedies as
                        Supplier may have under this Agreement, at law or in
                        equity), at its sole option do any or all of the
                        following: (i) suspend Services to Customer until such
                        time as such circumstance is corrected (provided
                        Supplier shall not be prohibited from terminating this
                        Agreement after suspending Services); (ii) cease
                        accepting or processing orders for services; (iii)
                        withhold delivery of CDR's; (iv) draw on any security
                        deposit or other assurance of payment submitted under
                        this Agreement; (v) terminate this Agreement without
                        liability to Supplier, which termination may include
                        immediate cancellation of the Services, or (x) pursue
                        such other remedy or relief as may be appropriate.

                        "Customer Default" shall mean Customer: (i) breaches any
                        material provision of this Agreement, including, but not
                        limited to, the provisions regarding payment, and does
                        not cure such breach within thirty days (five days with
                        respect to the first three payment breaches and no
                        notice period with respect to any further payment
                        breach) of notice thereof by Supplier; or (ii) files or
                        initiates proceedings or has proceedings filed or
                        initiated against it, relating to its liquidation,
                        insolvency, reorganization or other relief (such as the
                        appointment of a trustee, receiver, liquidator,
                        custodian or other official) under any bankruptcy,
                        insolvency or other similar law or makes an assignment
                        for the benefit of its creditors or enters into an
                        agreement for the composition, extension or readjustment
                        of its obligation in connection with the foregoing. If
                        Customer uses the Services for any unlawful purpose or
                        in any unlawful manner, Supplier shall have the right to
                        suspend any or all services hereunder to Customer until
                        the unlawful use ceases.

                10.     All other terms and conditions, provisions, supplements
                        and exhibits of the Agreement shall remain in full force
                        and effect.

<PAGE>   4

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date last
written below.

IXC COMMUNICATIONS SERVICES, INC.       UNIVERSAL ACCESS, INC.

BY: /s/ Signature Illegible             BY: /s/ Signature Illegible

NAME: LEO WELSH                         NAME: Robert J. Pommer
     ------------------------------          -----------------------------------

TITLE: PRES-WHOLESALE                   TITLE: Chief Operating Officer
      -----------------------------           ----------------------------------

DATE: 3/23/99                           DATE: March 18, 1999
     ------------------------------          -----------------------------------

<TABLE>
<S>                                <C>                    <C>
FULL BUSINESS ADDRESS:                                    FULL BUSINESS ADDRESS:
1122 CAPITAL OF TEXAS HWY. SOUTH                          100 N. RIVERSIDE PLAZA, SUITE 2200
AUSTIN, TEXAS 78746-6426           APPROVED AS TO FORM    CHICAGO, ILLINOIS 60606
TELEPHONE: 512-427-3700                LEGAL DEPT.        TELEPHONE: 312-660-5000
FACSIMILE: 512-328-7902                                   FACSIMILE: 312-660-5050
                                                          BILLING CONTACT: MARIA CAVAZOS
                                                          TELEPHONE: 312-491-1700
</TABLE>

<PAGE>   5

                                    Exhibit A

                                       IXC
                      PURCHASE ORDER/MARKET SERVICE ORDER

<TABLE>
<CAPTION>
                                                     (MSO)                      F&E#          __________
                                                                                ORBIT #:      __________
<S>                                         <C>                         <C>                   <C>
Customer _____________________________________________________
Order Contact _____________________         Phone Ext.                  Fax _______________
Tech Contact  _____________________         Phone Ext.                  Fax _______________
Req'st Svc Date: _____________ Term __________ Customer PON: ________________

        New    [ ]    Change     [ ]    Disconnect    [ ]     Expedite      [ ]
        IXC Circuit ID: _________________________

Circuit Type DS0          Protocol* AMI/SF         QTY ________         Rate _______          Mile _______

LOCATION A _________________________________              LOCATION Z ________________________________

LEC/CAP Provider __________________________               LEC/CAP Provider __________________________
CFA Release (Customer to Order Loop)    [ ]               CFA Release (Customer to Order Loop)    [ ]
IXC to Order Loop (Tech Sheet Required) [ ]               IXC to Order Loop (Tech Sheet Required) [ ]

Special Instructions _______________________       Special Instructions ______________________

--------------------------------------------

--------------------------------------------

--------------------------------------------

--------------------------------------------

Monthly IXC Charge    _______________              Installation _____________ ASR      ______
Location A Loop       _______________              Installation _____________ Expedite ______
Location Z Loop       _______________              Installation _____________ Reconfig ______
LSA Charge A          _______________
LSA Charge Z          _______________

Mux Charge            _______________              Installation _____________
Echo Canceller        _______________              Installation _____________
TOTAL                 _______________              TOTAL NON-RECURRING CHARGES  ____________
</TABLE>

Pursuant to the MASTER SERVICE AGREEMENT by and between IXC and Customer, IXC
agrees to provide the service described above. Service is contingent upon City
and circuit availability, Requested Service Dates and charges for service are
not binding on IXC and are subject to change until accepted by authorized
Customer Representative.

IN WITNESS WHEREOF, the parties have executed this PURCHASE ORDER on the _______
day of ________, 19______.

------------------------------------    ----------------------------------------
CUSTOMER APPROVAL/TITLE                 SUPPLIER AUTHORIZED REPRESENTATIVE

        PLEASE FAX THIS DOCUMENT TO CUSTOMER SERVICE FAX # (512) 433-7810

<PAGE>   6

EXHIBIT B PRIVATE LINE SERVICE ANCILLARY PRICING

<TABLE>
<CAPTION>
Service Charges                         DS-0         DS-1      DS-3       OC-3        OC-12       OC-48
---------------                         ----         ----      ----       ----        -----       -----
<S>                                     <C>          <C>       <C>        <C>         <C>         <C>
RECURRING:
----------
Minimum Circuit Charge                  [***]        [***]     [***]      [***]       [***]       [***]
NON RECURRING:
--------------
New Order Installation
Change of requested service date - 1st
Change of requested service date - 2nd
  and more
Order Change (pre-engineering)
Order Change (post-engineering)                                [***]
Order Cancellation (pre-engineering)
Order Cancellation (post-engineering)
ASR (new or disconnect) Special Access
ASR Supplement
Order Expedite
Reconfiguration
</TABLE>

*Customer must notify IXC of service date changes 45 days prior to due date.
Service date changes can be extended a maximum of 30 days after due date.
Service date changes for OC3, OC12, and OC48 bandwidth are restricted to one
change after which order will be subject to billing.

<TABLE>
<CAPTION>
CROSS-CONNECT CHARGE:
---------------------
<S>                                                       <C>
Recurring                                                 [***]
Non Recurring

INTERCONNECT CHARGE:
--------------------
Recurring                                                 [***]
Non Recurring
</TABLE>

*       (Other Interexchange carrier, local access or customer
        interconnect/collocation facility to Supplier local access or bypass
        facility within the same Supplier POP):

*       Interconnect charges apply to connections between Supplier POP's in the
        same city or between Supplier suite to another suite in the same
        building.

*       Since costs vary widely by location, the interconnect charges indicated
        above are the minimum amount that will be charged monthly.

*       All I.C.B. charges incurred by Supplier will be passed through to the
        Customer.

The following shall apply for all Waivers or discounted fees: If Circuit is
terminated prior to end of Circuit Lease Term, Supplier will pass on charges
incurred but not billed.

# Installation charges for On-Net circuits with a term of three (3) years or
greater shall be waived. The Installation Charge waiver does not apply for
circuits which are being up-graded. If Circuit is terminated prior to end of the
Circuit Lease Term, Supplier will pass on charges incurred but not billed.

<TABLE>
<CAPTION>
Other Charges                                             Recurring             Non-Recurring
-------------                                             ---------             -------------
<S>                                                       <C>                   <C>
M1/3 multiplex charges:
-----------------------
   1 Year Term                                             [***]
   2 Year Term                                             [***]
   3 Year Term                                             [***]
DACS Charge (Switching Only) per DSO                       [***]
DACS Port Charge (Bell Access to DACS) per                 [***]
DSO
</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.

                     Private Line Services Exhibit - Page 2

<PAGE>   7

<TABLE>
<S>                                                         <C>                  <C>
DS-1 DACS PORT                                              [***]

ECHO CANCELLER (PER CIRCUIT END)                            [***]                [***]
SECOND END LOOP (EX; FOR ADPCM)                             [***]                [***]

MAINTENANCE CHARGES:
--------------------
Trouble Assistance Ticket per dispatch:
---------------------------------------
Monday through Friday, 8 am to 5 pm                                              [***]    /   hr, 4 hr
                                                                                              minimum

After Hours                                                                      [***]    /   hr, 4 hr
                                                                                              minimum

(Work limited to recovery of downed circuits or
Equipment, not new installations)
</TABLE>

NOTES:

1.      All charges incurred by Supplier on Customer's behalf from any Local
Exchange Carrier, Competitive Access Provider or Competitive Local Exchange
Carrier will be directly passed on to the Customer.

2.      Services not described above will be considered special handling and
charges will be assessed on an Individual Case Basis (I.C.B.).

3.      All of the above changes are subject to changes with a 30-day notice.

4.      All Private Line ancillary service charges to cities not listed will be
priced on an individual case basis and will be subject to the terms and charges
of the underlying carrier.

**      ALL PRODUCTS, CROSS-CONNECTS AND INTERCONNECTS WILL BE PROVIDED BASED
UPON AVAILABILITY.

***     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.

                     PRIVATE LINE SERVICES EXHIBIT - PAGE 3

<PAGE>   8

EXHIBIT C - ON-NET CITY LISTING FOR PRIVATE LINE *
--------------------------------------------------
<TABLE>
<CAPTION>
LOCATION                    LATA         ADDRESS/(NPA)NXX
--------                    ----         ----------------
<S>                         <C>          <C>
Abilene, TX                 550          United Bank Bldg.
                                         1049 N. Third, #500,
                                         Abilene, Texas 79601
                                         (915)675
Albany, NY                  134          99 Washington St., Suite 411
                                         Albany, NY 12210
                                         (518)426
Atlanta, GA                 438          4311 Best Road
                                         College Park, GA 30337
                                         (404)762
Austin, TX                  558          621 Pleasant Valley Road
                                         Austin, TX 78702
                                         (512)320
Buffalo, NY                 140          350 Main St. Suite 512
                                         Buffalo, NY 14202
                                         (716)854
Charlotte, NC               422          112 N. Myers St.
                                         Charlotte, NC 28205
                                         (704)347
                                         (NO CO-LOCATE)
Chicago, IL                 358          Doral Plaza
                                         155 North Michigan Ave. #450
                                         Chicago, Illinois 60601
                                         (312)240
Cincinnati, OH              922          150 E. Forth
                                         2nd floor
                                         Cincinnati, OH 45202
                                         (513)784
                                         (NO CO-LOCATE)
Cleveland, OH               320          1150 W. 3 rd St.
                                         1st floor
                                         Cleveland, Oh 44110
                                         (216)771
                                         (NO CO-LOCATE)
Columbus, OH                328          550 W Broad St.
                                         Columbus, OH 43209
                                         (614)228
                                         (NO CO-LOCATE)
Corpus Christi, TX          564          606 N. Carancahua, Suite 816W
                                         Corpus Christi, TX 78476
                                         (512)882
Dallas-Americas             552          Tower of the Americas
                                         2323 Bryan St. Dallas TX 75201
                                         (214)969
Dallas-Electra              552          2223 N. Houston St.
                                         Dallas, TX 75202
                                         (214)954
Dayton, OH                               720 Germantown Rd.
                                         Dayton, OH 45402
                                         (513)461
                                         (NO CO-LOCATE)
El Paso, TX                 540          Texas Commerce Bank
                                         201 E. Main, #1702,
                                         (915)533
Fort Worth, TX              548          1101 E. 9th St.
                                         Ft. Worth, TX 76102
                                         (817)870
Harlingen, TX               568          513 E. Jackson, Matz Bldg.,
                                         Harlingen, TX 78550
                                         (210)425
Hayward, CA                 722          23965 Connecticut Ave.
                                         Hayward, CA. 94546
                                         (510) 259
Houston, TX                 560          293 N. Main Street,
                                         Houston, TX 77002
                                         (713)224
Houston, TX                 560          300 W. Richey Road
                                         Houston, TX 77090-5806
                                         (281)444
Indianapolis, IN            336          Indy Tel-Com Center
                                         720 Kentucky Ave., Suite 1
                                         Indianapolis, IN 46225
                                         (317)632
Joplin, MO                  522          501 South Main St., 2nd Floor
                                         Joplin, MO 64801
                                         (417)623
Kansas City, MO             524          Bank of Kansas City
                                         1125 Grand Ave., Ste. 1704
                                         Kansas City, MO 64106
                                         (816)283
Las Vegas, NV               721          4275 E Sahara Blvd.
                                         Suite 8 & 28
                                         Las Vegas, NV 89104
                                         (702)432
Los Angeles, CA             730          One Wilshire, 624 S. Grand Suite 1615
                                         Los Angeles, CA 90017
                                         (213)689
McAllen, TX                 568          Texas Commerce Bank
                                         200 S. 10th Street, Ste. 1704,
                                         McAllen, Texas 78501
                                         (956)687
Midland, TX                 542          2719 S. Midkiff Rd.
                                         Midland, Texas 79706
                                         (915)697
Newark, DE                  228          504 Interchange Blvd.
                                         Newark DE 19715
                                         (302)283
New York, NY                132          Western Union Bldg.
                                         60 Hudson St., Ste. 1010
                                         (212)732
Oklahoma City, OK           536          2112 East California
                                         Oklahoma City, OK 73104
                                         (405)232
Phoenix, AZ                 666          2600 N. Central, Basement
                                         Phelps-Dodge Tower
                                         Phoenix, AZ 85004
                                         (602)279
Phoenix, AZ                 666          2120 N. Central, Ste. G33
                                         Phoenix, AZ 85004
                                         (602)238
Rochester, NY               136          1 Exchange St., Suite 311
                                         Rochester, NY 14608
                                         (716)232
San Antonio, TX             566          660 S. Santa Rosa.
                                         San Antonio, TX 78204
                                         (210)225
</TABLE>

* SUBJECT TO AVAILABILITY.

                     PRIVATE LINE SERVICES EXHIBIT - PAGE 4

<PAGE>   9

EXHIBIT C - ON-NET CITY LISTING FOR PRIVATE LINE (CONT.) *                3.9.99
----------------------------------------------------------

<TABLE>
<CAPTION>
LOCATION                    LATA         ADDRESS/(NPA)NXX
--------                    ----         ----------------
<S>                         <C>          <C>
St. Louis, MO               520          900 Walnut, Suite 400
                                         St. Louis, MO 63102
                                         (314)436
Syracuse, NY                136          109 S. Warren St. Suite 628
                                         Syracuse, NY 13202
                                         (315)472
Tucson, AZ                  668          Bank of America Plaza, #1610-1620
                                         33 N. Stone
                                         Tucson, AZ 85701
                                         (520)792
Tulsa, OK                   538          Boatman's Center
                                         15 W. 6th St.
                                         Tulsa, OK 74119
                                         (918)584
Waco, TX                    556          100 S. 26th Street,
                                         Waco, X 76702
                                         (254)750
Washington, D.C.            236          1828 L. St.
                                         5th floor
                                         Washington, D.C. 20036
                                         (202)833
</TABLE>

* SUBJECT TO AVAILABILITY

                     PRIVATE LINE SERVICES EXHIBIT - PAGE 5

<PAGE>   10

EXHIBIT C - ON-NET CITY LISTING FOR OC PRODUCT                            3.9.99
----------------------------------------------

<TABLE>
<CAPTION>
LOCATION                    LATA         ADDRESS/(NPA)NXX
--------                    ----         ----------------
<S>                         <C>          <C>
Atlanta, GA                 438          4311 Best Road
                                         College Park, GA 30337
                                         (404)762
Albany, NY                  134          99 Washington St., Suite 411
                                         Albany, NY 12210
                                         (518)426
Austin, TX                  558          621 Pleasant Valley Road
                                         Austin, TX 78702
                                         (512)320
Charlotte, NC               422          112 N. Myers St.
                                         Charlotte, NC 28205
                                         (704)347
                                         (NO CO-LOCATE)
Chicago, IL                 358          Doral Plaza
                                         155 North Michigan Ave. #450
                                         Chicago, Illinois 60601
                                         (312)240
Dallas-Electra              552          2223 N. Houston St.
                                         Dallas, TX 75202
                                         (214)954
Fort Worth                  548          1101 E. 9th St.
                                         Ft. Worth, TX 76102
                                         (817)870
Hayward, CA                 722          23965 Connecticut Ave.
                                         Hayward, CA. 94546
                                         (510)259
Houston, TX                 560          293 N. Main Street,
                                         Houston, TX 77002
                                         (713)224
Las Vegas, NV               721          4275 East Sahara Ave.
                                         Suites 8 & 28
                                         Las Vegas, NV 89104
                                         (702)432
Houston, TX                 560          300 W. Richey Road
                                         Houston, TX 77090-5806
                                         (281)444
Los Angeles, CA             730          One Wilshire
                                         624 S. Grand Suite 1615
                                         Los Angeles, CA 90017
                                         (213)689
New York, NY                132          Western Union Bldg.
                                         60 Hudson St.,
                                         Ste. 1010
                                         (212)732
Newark, DE                  228          504 Interchange Blvd
                                         Newark, DE 19715
                                         (302)283
Phoenix, AZ                 666          2600 N. Central, Basement
                                         Phelps-Dodge Tower
                                         Phoenix, AZ 85004
                                         (602)279
Phoenix, AZ                 666          2120 N. Central, Ste. G33
                                         Phoenix, AZ 85004
                                         (602)238
Rochester, NY               136          1 Exchange St., Suite 311
                                         Rochester, NY 14608
                                         (716)232
San Antonio, TX             566          660 S. Santa Rosa,
                                         San Antonio, Texas 78204
                                         (210)225
St. Louis, MO               520          900 Walnut, Suite 400
                                         St. Louis, MO 63102
                                         (314)436
Washington, D.C.            236          1828 L. St.
                                         5th floor
                                         Washington D.C. 20036
                                         (202)296
</TABLE>

All OC-X service is subject to availability.

                     PRIVATE LINE SERVICES EXHIBIT - PAGE 6

<PAGE>   11

EXHIBIT D - PRIVATE LINE PRICING
--------------------------------

<TABLE>
<CAPTION>
                                          RATE PER V&H DS-0 MILE/CIRCUIT LEASE TERM
                                          -----------------------------------------
SERVICE TYPE                                            1 YEAR     3 YEAR     5 YEAR
------------                                            ------     ------     ------
<S>                                                     <C>        <C>        <C>
DS-0                                                    [***]      [***]      [***]

DS-1

DS-3                                                               [***]

OC-3

OC-12

MINIMUM CIRCUIT CHARGES:

                             DS-0                  [***]
                             DS-1                  [***]
                             DS-3                  [***]
                             OC-3                  [***]
                             OC-12                 [***]

MINIMUM CIRCUIT TERM:        One (1) Year
</TABLE>

NOTES:

------

1.      ALL PRIVATE LINE SERVICE TO CITIES NOT LISTED ON EXHIBIT C WILL BE
        PRICED ON AN INDIVIDUAL CASE BASIS AND WILL BE SUBJECT TO THE TERMS OF
        THE UNDERLYING CARRIER.

2.      CIRCUITS CURRENTLY UNDER TERM MAY BE RE-RATED IF A NEW CIRCUIT LEASE
        TERM IS REQUESTED.

                     Private Line Services Exhibit - Page 7

*** 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.

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00003-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00003-of-00352.parquet"}]]