Document:

<PAGE>
                              AMENDMENT AND CONSENT

                           Dated as of August 24, 2001

                  Reference is hereby made to the Amended and Restated
Participation Agreement dated as of September 2, 1998 among Williams
Communications, LLC, formerly Williams Communications, Inc. (the "Company"),
State Street Bank and Trust Company of Connecticut, National Association, not in
its individual capacity, but solely as Trustee of the 1998 WCI Trust (the
"Trustee"), the Persons named therein as Note Holders, as Certificate Holders
and as APA Purchasers, State Street Bank and Trust Company, not in its
individual capacity, but solely as Collateral Agent, and Citibank, N.A., as
Agent (as amended and supplemented through the date hereof, the "Participation
Agreement"). Capitalized terms used but not otherwise defined herein shall have
the meanings ascribed to such terms in the Participation Agreement.

                  Reference is also made to the Asset Purchase Agreement dated
as of September 2, 1998 among CXC Incorporated, WC Network Funding LLC, each of
the financial institutions that has executed a signature page to the Asset
Purchase Agreement or an Assignment of Purchase Commitment (the "APA
Purchasers"), Citibank, N.A., as Agent for the APA Purchasers, and Citicorp
North America, Inc. (the "Asset Purchase Agreement").

                  WHEREAS, the parties desire to effect certain amendments to
the Participation Agreement and the Asset Purchase Agreement;

                  NOW, THEREFORE, the undersigned hereby agree as follows:

                  1. Amendment to the Participation Agreement. The Participation
Agreement is hereby amended as follows:

                  (a) The Commitment Fee chart set forth in Section A of Part II
to Schedule II to the Participation Agreement is hereby deleted in its entirety
and restated as follows:

<Table>
<Caption>

                                                                             Commitment
                                                                                Fee(2)
                                Ratings Level(1)                           (bps per annum)
                                ----------------                           ---------------
<S>                                                                        <C>
                  A/A2 or Better                                                23.0
                  A-/A3                                                         23.5
                  BBB+/Baal                                                     24.5
                  BBB/Baa2                                                      25.0
                  BBB-/Baa3                                                     28.0
                  Lower than BBB-/Baa3                                          38.0
</Table>

(1) If the Guarantor is split-rated, the higher rating level will apply.

<PAGE>
(2) The Collateral Purchase Account fee shall equal the Commitment/Liquidity
Backstop Fee multiplied by 1.2.

                  (b) Paragraph (d) of Section 1.06 of the Participation
Agreement is hereby deleted in its entirety.

                  (c) Appendix A of the Participation Agreement is hereby
amended by deleting in its entirety the definition of "Guarantor" contained
therein and replacing it with the following: "'Guarantor' means The Williams
Companies, Inc., successor in interest by merger dated July 31, 1999 to
Williams Holdings of Delaware, Inc.".

                  (d) Appendix A of the Participation Agreement is hereby
amended by deleting in its entirety the definition "Guaranty" contained therein
and replacing it with the following: "'Guaranty' means the Second Amended and
Restated Guaranty Agreement dated as of August 17, 2000 between The Williams
Companies, Inc., the Trustee, the Collateral Agent, the Agent and Citibank,
N.A., as APA Agent."

                  2. Amendments to the Asset Purchase Agreement. The Asset
Purchase Agreement is hereby amended as follows:

                  (a) The first paragraph of Section 2(a) of the Asset Purchase
Agreement is hereby deleted and restated in its entirety as follows:

                  "(a) From time to time upon notice from the Securitization
Company (or CNAI or any other agent designated by the Securitization Company to
give such notice on behalf of the Securitization Company) to the Agent (which
shall give prompt notice thereof to one or more of the Purchasers, as selected
by the Agent in its discretion), each of such Purchaser or Purchasers as shall
have received such notice shall, from time to time on or prior to such
Purchaser's Purchase Termination Date (as defined in Section 5), purchase
without recourse to the Securitization Company (except in the case of a breach
by the Securitization Company of its express representations, warranties and
other obligations hereunder), on the terms and conditions herein set forth, the
Securitization Percentage Interest that the Securitization Company offers for
sale to such Purchaser (it being understood and agreed that the Securitization
Company may give any such notice to the Agent for any reason whatsoever). Each
such notice of purchase shall be given by the Agent to each applicable Purchaser
no later than 12:00 noon (New York City time) on the date of such purchase
(which shall be a Business Day (as defined below)), shall be sent by telecopier,
telex or cable to all such Purchasers concurrently, and shall specify the date
of such purchase (which shall be a Business Day) and the Advance or Advances or
portion thereof in which the interest is to be purchased by such Purchaser
(identified by term and principal amount). Prior to 3:00 p.m. (New York City
time) on the date of such purchase, such Purchaser shall pay to the Agent for
the account of the Securitization Company, in immediately available funds in
United States dollars, by depositing to an account specified by the Agent at the
office of Citibank at 399 Park Avenue, New York, New York 10043 (the "Agent's
Account"), an amount (such Purchaser's "Securitization Purchase Price") equal to
such Purchaser's Percentage multiplied by the sum of (i) the then unpaid
principal amount of such Advance or Advances (or such

                                       2
<PAGE>

portion thereof) plus (ii) the aggregate unpaid interest payable on such Advance
or Advances (or such portion thereof) (including Capitalized Interest) through
the maturity dates thereof. After the Agent's receipt of such funds, the Agent
will make such funds available to the Securitization Company by crediting an
account specified by the Securitization Company at the office of Citibank as
aforesaid (the "Securitization Company's Account"). For purposes of this
Agreement, the term "Business Day" means any day other than a Saturday, Sunday
or any other day on which banks in New York, New York, are required or
authorized to close."

                  (b) The first sentence of Section 7(b) of the Asset Purchase
Agreement is hereby deleted and restated in its entirety to read as follows:

                  "(b) Subject to Section 7(c), whenever any amount or principal
or interest is paid in connection with any Advance, or any Company Note, in
which any Purchaser has purchased a Percentage Interest, the Securitization
Company or the Borrower, as the case may be, will promptly pay, or cause to be
paid, out of such funds received by it, to the Agent at the Agent's Account for
the account of such Purchaser, in immediately available funds in United States
dollars, such Purchaser's Percentage of such principal amount and its Percentage
of accrued interest on the principal amount of the Advance or Company Note, as
the case may be, adjusted to reflect the fact that such Purchaser is entitled to
interest on its applicable Purchase Price."

                  (c) Sections 18(b)(iv) and 18(b)(v) of the Asset Purchase
Agreement are hereby deleted in their entirety.

                  3. Representations and Warranties of the Company. The Company
hereby represents and warrants that as of the date hereof (except for any such
representations or warranties relating to a specific earlier date or time
period) and after giving effect to this Amendment and Consent:

                           (a) all of the representations and warranties of the
         Company set forth in the Operative Documents (other than those
         contained in Section 3.01(x) of the Participation Agreement) are true
         and correct in all material respects;

                           (b) there are no offsets, defenses or counterclaims
         against the obligations of the Company under the Operative Documents;

                           (c) no Default, Event of Default or Environmental
         Trigger exists on the part of the Company; and

                           (d) this Amendment and Consent has been duly executed
         and delivered by the Company and is the legal, valid and binding
         obligation of the Company, enforceable against the company, in
         accordance with its terms, subject to applicable bankruptcy,
         insolvency, reorganization, moratorium or similar laws affecting the
         enforceability of creditors' rights generally and by general principles
         of equity.

                  4. Representations and Warranties of the Guarantor. The
Williams Companies, Inc. (the "Guarantor") hereby represents and warrants that
as of the date hereof

                                       3
<PAGE>

(except for any such representations or warranties relating to a specific
earlier date or time period) and after giving effect to this Amendment and
Consent:

                           (a) all of the representations and warranties of the
         Guarantor set forth in the Operative Documents (other than those
         contained in Section 3.01(m) of the Second Amended and Restated
         Guaranty Agreement dated as of August 17, 2000 between the Guarantor,
         the Trustee, the Collateral Agent, the Agent and the APA Agent) are
         true and correct in all material respects;

                           (b) there are no offsets, defenses or counterclaims
         against the obligations of the Guarantor under the Operative Documents;

                           (c) no Default, Event of Default or Environmental
         Trigger exists on the part of such Guarantor; and

                           (d) this Amendment and Consent has been duly executed
         and delivered by the Guarantor and is the legal, valid and binding
         obligation of the Guarantor, enforceable against the company, in
         accordance with its terms, subject to applicable bankruptcy,
         insolvency, reorganization, moratorium or similar laws affecting the
         enforceability of creditors' rights generally and by general principles
         of equity.

                  5. Trustee. The undersigned Note Holders and Certificate
Holders hereby (a) direct the Trustee to give its consent to the actions
contemplated hereby by executing and delivering this Amendment and Consent, and
(b) consent to the execution and delivery by the Trustee of this Amendment and
Consent.

                  6. Consent. CXC and each APA Purchaser executing this
Amendment and Consent as an APA Purchaser hereby directs the SPV to execute and
deliver this Amendment and Consent.

                  7. Effective Date. This Amendment and Consent shall be
effective on the date first above written.

                  8. Full Force and Effect. Except as specifically amended
hereby, the Operative Documents and the Securitization Documents shall remain in
full force and effect and are hereby ratified and confirmed.

                  9. Exculpation of the Trustee. Except for its own gross
negligence or willful misconduct and as otherwise expressly provided in the
Operative Documents, it is expressly understood and agreed by the parties hereto
that (a) this Amendment and Consent is executed and delivered by SSBTC, not in
its individual capacity but solely as Trustee under the Declaration of Trust, in
the exercise of the powers and authority conferred and vested in it as the
Trustee, (b) each of the undertakings and agreements herein made on the part of
the Trustee is made and intended not as a personal representation, undertaking
and agreement by SSBTC but is made and intended for the purpose for binding only
the Trust Estate created by the Declaration of Trust, (c) nothing herein
contained shall be construed as creating any

                                       4
<PAGE>

liability on SSBTC, individually or personally, to perform any obligation of the
Trustee either expressed or implied contained herein or in the Operative
Documents, all such liability, if any, being expressly waived by the parties to
this Amendment and Consent and by any Person lawfully claiming by, through or
under the parties to this Amendment and Consent and (d) under no circumstances
shall SSBTC be personally liable for the payment of any indebtedness or expenses
of the Trustee or be liable for the breach or failure of any obligation,
representation, warranty or covenant made or undertaken by the Trustee under the
Operative Documents.

                  10. Exculpation of the Collateral Agent. Except for its own
gross negligence or willful misconduct and as otherwise provided in the
Operative Documents, it is expressly understood and agreed by the parties hereto
that (a) this Agreement is executed and delivered by the Collateral Agent, not
in its individual capacity but solely as Collateral Agent, under the Interparty
Agreement, in the exercise of the powers and authority conferred and vested in
it as the Collateral Agent, (b) nothing herein contained shall be construed as
creating any liability on the Collateral Agent, individually or personally, to
perform any obligation of the Collateral Agent either expressed or implied
contained herein or in the Operative Documents, all such liability, if any,
being expressly waived by the Parties and by any Person claiming by, through or
under the Parties and (c) under no circumstances shall the Collateral Agent be
personally liable for the payment of any indebtedness or expenses of the
Collateral Agent or be liable for the breach or failure of any obligation,
representation, warranty or covenant made or undertaken by the Collateral Agent
under this Agreement or the Operative Documents except where such breach or
failure is the result of the Collateral Agent's willful misconduct or gross
negligence.

                  11. Governing Law. This Amendment and Consent shall be
governed by and construed under the laws of the State of New York.

                  12. Counterparts. This Amendment and Consent may be executed
in any number of counterparts, each of which shall, when executed, be deemed to
be an original and all of which taken together shall be deemed to be one and the
same agreement. Delivery of an executed counterpart of a signature page to this
Amendment and Consent by telecopier shall be effective as delivery of a manually
executed counterpart of this Amendment and Consent.

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment and Consent to be duly executed by their officers thereunto duly
authorized as of the day and year first above written.

                            [SIGNATURE PAGES FOLLOW.]

                                       5
<PAGE>

                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        WILLIAMS COMMUNICATIONS, LLC

                                        By:
                                           -------------------------------------
                                              Name:
                                              Title:

                                        THE WILLIAMS COMPANIES, INC.

                                        By:
                                           -------------------------------------
                                              Name:
                                              Title:

<PAGE>

                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        STATE STREET BANK AND TRUST COMPANY OF
                                        CONNECTICUT NATIONAL ASSOCIATION, not in
                                        its individual capacity but solely as
                                        Trustee of the 1998 WCI Trust, as
                                        Trustee and Lessor

                                        By:
                                           -------------------------------------
                                              Name:
                                              Title:

                                        STATE STREET BANK AND TRUST COMPANY, not
                                        in its individual capacity but solely as
                                        Collateral Agent

                                        By:
                                           -------------------------------------
                                              Name:
                                              Title:

<PAGE>

                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        CITIBANK, N.A., as Agent

                                        By:
                                           -------------------------------------
                                              Name:
                                              Title:

                                        CITIBANK, N.A.
                                        as APA Purchaser

                                        By:
                                           -------------------------------------
                                              Name:
                                              Title:

<PAGE>

                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        CXC INCORPORATED

                                        By: CITICORP NORTH AMERICA, INC.,
                                            as attorney-in-fact

                                        By:
                                           -------------------------------------
                                              Name:
                                              Title:

                                        CITICORP NORTH AMERICA, INC.,
                                          as administrative agent for CXC
                                          Incorporated and as RCE Agent

                                          By:
                                              ---------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        WC NETWORK FUNDING LLC,
                                        as Note Holder

                                        By: WC Network Holdings, Inc.,
                                            its sole member

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        FBTC LEASING CORP.,
                                        as Certificate Holder

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        SCOTIABANC INC.,
                                        as Certificate Holder

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

                                        THE BANK OF NOVA SCOTIA,
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        BANK OF MONTREAL,
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        ROYAL BANK OF CANADA,
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        BANK OF AMERICA, N.A., as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        THE CHASE MANHATTAN BANK,
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        BARCLAYS BANK PLC,
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        TORONTO DOMINION (TEXAS), INC.
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        ABN AMRO BANK, N.V.
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        FLEET NATIONAL BANK (f/k/a BankBoston,
                                        N.A.), as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        CIBC INC., as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        THE BANK OF NEW YORK,
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        BNP PARIBAS, as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        COMMERZBANK AG, NEW YORK AND
                                        GRAND CAYMAN BRANCHES, as APA
                                        Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

<PAGE>
                     SIGNATURE PAGE TO AMENDMENT AND CONSENT
                           DATED AS OF AUGUST 24, 2001
                  WITH RESPECT TO WILLIAMS COMMUNICATIONS, LLC
                      SECURITIZED ASSET DEFEASANCE PROGRAM

                                        CREDIT AGRICOLE INDOUSUEZ,
                                        as APA Purchaser

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:

                                        By:
                                           ------------------------------------
                                              Name:
                                              Title:<PAGE>
                                                                  CONFORMED COPY

                      AMENDMENT NO. 1 TO SECURITY AGREEMENT

         AMENDMENT dated as of September 17, 2001 to the Security Agreement
dated as of April 23, 2001 among WILLIAMS COMMUNICATIONS, LLC, WILLIAMS
COMMUNICATIONS GROUP, INC., the SUBSIDIARY LOAN PARTIES party thereto, and BANK
OF AMERICA, N.A., as Administrative Agent.

                                   WITNESSETH:

         WHEREAS, the parties hereto desire to amend the Security Agreement to
provide the Administrative Agent, for the benefit of the Lenders, with a
security interest in certain additional assets;

         NOW, THEREFORE, the parties hereto agree as follows:

         SECTION 1. Defined Terms; References. Unless otherwise specifically
defined herein, each term used herein which is defined in the Security Agreement
has the meaning assigned to such term in the Security Agreement. Each reference
to "hereof", "hereunder", "herein" and "hereby" and each other similar reference
and each reference to "this Agreement" and each other similar reference
contained in the Security Agreement and each other Loan Document shall, from and
after the date of effectiveness of this Amendment, refer to the Security
Agreement as amended hereby.

         SECTION 2. Grant of Additional Collateral. Section 2(a) of the Security
Agreement is amended by:

         (i) deleting the "and" at the end of clause (xii) thereof;

         (ii) renumbering clause (xiii) thereof as clause (xiv) thereof, and
replacing the reference therein to "clause (xii)" with a reference to "clause
(xiii)"; and

         (iii) adding a new clause (xiii) immediately after clause (xii)
thereof, to read in its entirety as follows: "(xiii) any assets now or hereafter
owned by any Lien Grantor and used by the Borrower's broadband media unit in its
business of providing domestic and international transmission of live and
non-live media content through integrated fiber-optic, satellite and teleport
services to media content service providers, including any such asset
constituting the application infrastructure referred to as "MediaXtranet(SM)"
and those assets listed on

<PAGE>

Schedule 3 (all the assets described in this clause (xiii), collectively, the
"Broadband Media Assets"); and".

         SECTION 3. Deletion of Certain Exceptions to Collateral. Section 2(b)
of the Security Agreement is hereby amended by:

          (i) restating clause (i) thereof to read in its entirety as follows:
"(i) 34% of any Equity Interests in any Foreign Subsidiary or any Equity
Interest in any Unrestricted Subsidiary;"; and

         (ii) restating clauses (ii) and (iv) thereof to read in their entirety
as follows: "(ii) intentionally deleted;" and "(iv) [intentionally deleted]".

         SECTION 4. Release of Broadband Media Assets Upon Certain Conditions.
Section 17(b) of the Security Agreement is amended by (i) adding a new clause
(v) immediately before clause (w) thereof, to read in its entirety as follows:
"(v) with respect to any Broadband Media Assets shall automatically terminate
upon such Lien Grantor consummating a sale, transfer, lease or other disposition
permitted by Section 6.05 of the Credit Agreement; provided that if after giving
effect to any such sale, transfer, lease or other disposition the fair market
value of all Broadband Media Assets sold, transferred, leased or otherwise
disposed is equal to or greater than $50,000,000, the terms thereof shall have
been approved by all the Incremental Facility Arrangers and the Administrative
Agent prior to the consummation thereof,"; and (ii) by inserting in clause (z)
thereof "any Broadband Media Assets or" immediately after "with respect to" and
"and, if required, the terms of any sale, transfer, lease or other disposition
of any Broadband Media Assets shall have been approved by all the Incremental
Facility Arrangers and the Administrative Agent prior to the consummation
thereof" immediately after "no Default shall have occurred and then be
continuing".

         SECTION 5. Additional Secured Obligations. Section 18 of the Security
Agreement is amended and restated to read in its entirety as follows: "The
Borrower may from time to time designate its obligations or the obligations of
any Subsidiary Loan Party under any Hedging Agreement with any Lender or any
affiliate of any Lender as an additional Secured Obligation for purposes of the
Collateral Documents by delivering to the Administrative Agent a certificate
signed by a Financial Officer that (i) identifies such Hedging Agreement,
specifying the name and address of the other party thereto, the notional
principal amount thereof and the expiration date thereof and (ii) states that
the Borrower's or the Subsidiary Loan Party's obligations thereunder are
designated as Secured Obligations for purposes of the Collateral Documents."

         SECTION 6. Exhibits. Schedule A to Exhibit B to the Security Agreement
is hereby replaced with Schedule A attached hereto.

                                       2
<PAGE>

         SECTION 7. Representations and Warranties. Each of the Lien Grantors
represents and warrants that (i) each of the representations and warranties
applicable to it as set forth in Section 3 of the Security Agreement will be
true on and as of the date of effectiveness of this Amendment (except in the
case of any such representation or warranty that, by its terms expressly relates
only to a specified earlier date, each of which representations and warranties
was true as of such specified earlier date), after giving effect to the
amendments to the Security Agreement contemplated hereby.

         SECTION 8. Governing Law. This Amendment shall be governed by and
construed in accordance with the laws of the State of New York.

         SECTION 9. Counterparts. This Amendment may be signed in any number of
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

         SECTION 10. Effectiveness. This Amendment shall become effective on and
as of the date when the Administrative Agent shall have received from each Lien
Grantor and the Administrative Agent a counterpart hereof signed by such party
or facsimile or other written confirmation (in form satisfactory to the
Administrative Agent) that such party has signed a counterpart hereof.

         SECTION 11. Further Assurances. Without limiting in any manner its
obligations set forth in Section 4 of the Security Agreement, each Lien Grantor
agrees that it will comply with the provisions of Section 4 of the Security
Agreement to the extent necessary or desirable in order to create and perfect
the Transaction Liens granted on the additional assets that will constitute
"Collateral" of such Lien Grantor upon the effectiveness of this Amendment,
including by executing and delivering to the Administrative Agent such UCC
financing statements and amendments thereto as the Administrative Agent shall
request and delivering to the Administrative Agent and the Lenders an opinion of
counsel reasonably satisfactory to the Administrative Agent with respect to the
creation and perfection of such Transaction Liens.

                                       3
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the date first above written.

                                   WILLIAMS COMMUNICATIONS, LLC

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                        Title: Vice President and Treasurer

                                   WILLIAMS COMMUNICATIONS GROUP, INC.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                        Title: Vice President and Treasurer

                                   BANK OF AMERICA, N.A., as Administrative
                                   Agent

                                   By /s/ Pamela S. Kurtzman
                                      ------------------------------------------
                                        Title: Principal

                                   CRITICAL CONNECTIONS, INC.

                                   By  /s/ Howard S. Kalika
                                      ------------------------------------------
                                        Title: Vice President and Treasurer

                                       4
<PAGE>

                                   WCS COMMUNICATIONS SYSTEMS, INC.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                   WCS, INC.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                   WILLIAMS COMMUNICATIONS OF VIRGINIA, INC.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                   WILLIAMS COMMUNICATIONS PROCUREMENT, L.L.C.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                       5
<PAGE>

                                   WILLIAMS COMMUNICATIONS PROCUREMENT, LP

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                   WILLIAMS GLOBAL
                                       COMMUNICATIONS HOLDINGS, INC.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                   WILLIAMS INTERNATIONAL VENTURES COMPANY

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                   WILLIAMS LEARNING NETWORK, INC.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                   WILLIAMS LOCAL NETWORK, LLC

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                       6
<PAGE>

                                   WILLIAMS TECHNOLOGY CENTER, LLC
                                       By:  Williams Communications, LLC As Sole
                                       Member.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                       Title: Vice President and Treasurer

                                   WILLIAMS COMMUNICATIONS AIRCRAFT, LLC

                                       By:  Williams Communications, LLC As Sole
                                       Member.

                                   By /s/ Howard S. Kalika
                                      ------------------------------------------
                                         Title: Vice President and Treasurer

                                       7

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