Document:

<PAGE>
                                                                  EXHIBIT 10.101

                         Amendment No. 1 to Side Letter

                                                    Dated as of January 14, 2002

         Reference is hereby made to the following:

                  (i) that certain letter agreement dated as of October 30, 2001
         (the "Side Letter") between Williams Communications, LLC (the
         "Borrower") and Williams Communications Group, Inc. ("Holdings"), on
         the one hand, and Bank of America, as Administrative Agent and as
         Issuing Bank, JP Morgan Chase Bank (formerly The Chase Manhattan Bank),
         as Syndication Agent and as Issuing Bank, Salomon Smith Barney Inc., as
         Co-Documentation Agent, Lehman Brothers, Inc., as Co-Documentation
         Agent and Merrill Lynch & Co., Inc., as Co-Documentation Agent, on the
         other hand; and

                  (ii) that certain Amended and Restated Credit Agreement dated
         as of September 8, 1999 (as amended, the "Credit Agreement"), among the
         Borrower, Holdings, the lenders party thereto (the "Lenders"), Bank of
         America, N.A., as Administrative Agent for the Lenders (in such
         capacity, the "Administrative Agent"), JP Morgan Chase Bank, (formerly
         The Chase Manhattan Bank), as Syndication Agent, Salomon Smith Barney
         Inc. and Lehman Brothers, Inc., as Joint Lead Arrangers and Joint
         Bookrunners with respect to the Incremental Facility referred to
         therein, and Salomon Smith Barney Inc., Lehman Brothers, Inc. and
         Merrill Lynch & Co., Inc., as Co-Documentation Agents.

         Capitalized terms not otherwise defined herein are used herein as
defined in the Side Letter.

         The Borrower and Holdings hereby acknowledge that the review, analysis
and due diligence regarding the business operations of Holdings, the Borrower
and the Subsidiaries and the preliminary budget dated October 1, 2001, by
PricewaterhouseCoopers, LLP, continues to be in process. As a result thereof,
the parties to the Side Letter hereby agree, by executing this Amendment No. 1
to the Side Letter (the "Amendment"), that the Negotiation Period (as defined in
the Side Letter) shall be extended until the earlier of (i) 12:00 noon (New York
City time) on January 28, 2002 and (ii) the effective date of the Seventh
Amendment (as defined in Section 3(C) of Amendment No. 6).

         This Amendment shall not become effective until the date (the
"Amendment Effective Date") on which (i) the Administrative Agent shall have
received fully executed counterparts hereof executed by the Loan Parties, the
Issuing Bank and all of the Agents, together with the consent of the Required
Lenders to this Amendment as set forth hereinbelow; and (ii) all legal matters
incident to this Amendment and the effects hereof or any of the Loan Documents
shall be reasonably satisfactory to the Agents and their counsel.

         Each of the Loan Parties represents and warrants to the Agents and the
Lenders that (X) the execution, delivery and performance by the Loan Parties of
this Amendment and the performance by each of them of the Side Letter as
modified by this Amendment (i) have been duly authorized by all requisite
corporate, partnership or limited liability company action (as applicable) on
the part of each such Loan Party; and (ii) will not violate (a) any provision of
any statute, rule or regulation, or the Certificate of Incorporation or By-laws
(or similar governing documents) of any of the Loan Parties, (b) any applicable
order of any court or any rule, regulation or order of any other agency of
government or (c) any indenture, agreement or other instrument to which any of
the Loan Parties is a party or by which any of the Loan Parties or any of their
respective properties is bound, or be in conflict with, result in a breach of,
or

<PAGE>

constitute (with notice or lapse of time or both) a default under, any such
indenture, agreement, or other instrument; and (Y) upon the occurrence of the
Amendment Effective Date, this Amendment will constitute the legal, valid and
binding obligation of the Loan Parties, enforceable in accordance with its
terms, except as the enforceability thereof may be limited by applicable
bankruptcy, insolvency, reorganization or other similar laws affecting
creditors' rights generally and by general equitable principles (regardless of
whether the issue of enforceability is considered in a proceeding in equity or
at law).

         The Loan Parties hereby agree that in the event any Loan Party or
Unrestricted Subsidiary shall fail to observe or perform any agreement set forth
in the Side Letter as amended by this Amendment, such event shall be an
immediate Event of Default under the Credit Agreement not requiring any notice,
lapse of time or other action on the part of any of the Agents or the Lenders;
and the Administrative Agent and/or the Required Lenders may exercise any and
all remedies it or they may have pursuant to any of the Loan Documents or other
applicable law.

         The Borrower acknowledges and agrees that its obligations set forth in
Section 10.03 of the Credit Agreement include the preparation, execution and
delivery of this Amendment, and any other documentation contemplated hereby,
including, but not limited to, the reasonable fees and disbursements of Clifford
Chance Rogers & Wells LLP, counsel to the Administrative Agent and PWC.

         Except to the extent hereby waived or modified, the Side Letter remains
in full force and effect and is hereby ratified and confirmed. This Amendment
shall be limited precisely as written and shall not be deemed (i) to be a
consent granted pursuant to, or a waiver or modification of, any other term or
condition of the Side Letter or any of the instruments or agreements referred to
therein or a waiver of any Default or Event of Default under the Credit
Agreement, whether or not known to the Agents or the Lenders or (ii) to
prejudice any right or rights which the Administrative Agent or the Lenders may
now have or have in the future under or in connection with any Loan Document or
any of the instruments or agreements referred to in a Loan Document. The
Administrative Agent (on behalf of itself and the Lenders) and the other Agents
hereby expressly reserve all of the Administrative Agent's, the other Agents'
and the Lenders' (as applicable) respective rights and remedies under the Credit
Agreement and each of the other Loan Documents, as well as under applicable law.
Except to the extent hereby waived or modified, the Side Letter shall continue
in full force and effect in accordance with the provisions thereof on the date
hereof and the Side Letter as modified by this Amendment is hereby ratified and
confirmed. As used in the Side Letter, the terms "Side Letter," "this
Agreement," "herein," "hereafter," "hereto," "hereof," and words of similar
import, shall, unless the context otherwise requires, mean the Side Letter as
modified by this Amendment. Reference to the terms "Side Letter" appearing in
the other Loan Documents shall, unless the context otherwise requires, mean the
Side Letter as modified by this Amendment. This Amendment shall be deemed to
have been jointly drafted, and no provision of it shall be interpreted or
construed for or against any party hereto because such party purportedly
prepared or requested such provision, any other provision, or this Amendment as
a whole.

         This Amendment may be executed in any number of counterparts and by the
different parties hereto in separate counterparts, each of which when so
executed and delivered shall be deemed to be an original and all of which taken
together shall constitute but one and the same instrument. Delivery of an
executed signature page to this Amendment by facsimile shall be as effective as
delivery of a manually executed counterpart of this Amendment.

         This Amendment is a Loan Document pursuant to the Credit Agreement and
shall (unless expressly indicated herein or therein) be construed, administered,
and applied, in accordance with all of the terms and provisions of the Credit
Agreement.

                                       2
<PAGE>

         THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH,
THE LAWS OF THE STATE OF NEW YORK WHICH ARE APPLICABLE TO CONTRACTS MADE AND TO
BE PERFORMED WHOLLY WITHIN THE STATE OF NEW YORK.

         The provisions of this Amendment shall be binding upon, and inure to
the benefit of, the parties hereto and their respective successors and assigns.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                       3
<PAGE>

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

                                 BORROWER:

                                 WILLIAMS COMMUNICATIONS, LLC

                    [STAMP]      By:    /s/ HOWARD S. KALIKA
                                     -------------------------------------------
                                      Name:
                                      Title:

                                 HOLDINGS:

                    [STAMP]      WILLIAMS COMMUNICATIONS GROUP, INC.

                                 By:    /s/ HOWARD S. KALIKA
                                     -------------------------------------------
                                      Name:
                                      Title:

                                 SUBSIDIARY LOAN PARTIES:

                                 CRITICAL CONNECTIONS, INC.
                                 WCS COMMUNICATIONS SYSTEMS, INC.
                                 WCS, INC.
                                 WILLIAMS COMMUNICATIONS OF VIRGINIA, INC.
                                 WILLIAMS COMMUNICATIONS PROCUREMENT, L.L.C.
                                 WILLIAMS COMMUNICATIONS PROCUREMENT, LP
                                 WILLIAMS GLOBAL COMMUNICATIONS
                                      HOLDINGS, INC.
                                 WILLIAMS INTERNATIONAL VENTURES COMPANY
                                 WILLIAMS LEARNING NETWORK, INC.
                                 WILLIAMS LOCAL NETWORK, LLC
                                 WILLIAMS TECHNOLOGY CENTER, LLC
                                 WILLIAMS COMMUNICATIONS AIRCRAFT, LLC
                                 WILLIAMS COMMUNICATIONS MANAGED
                                      SERVICES, LLC

                    [STAMP]      By:    /s/ HOWARD S. KALIKA
                                     -------------------------------------------
                                      Name:
                                      Title:

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       4
<PAGE>

                                 ISSUING BANK AND AGENTS:

                                 BANK OF AMERICA, N.A., as Administrative Agent
                                 and as Issuing Bank

                                 By: /s/ JOHN W. WOODIEL III
                                     -------------------------------------------
                                      Name:  John W. Woodiel III
                                      Title: Managing Director

                                 JP MORGAN CHASE BANK
                                 (formerly The Chase Manhattan Bank), as
                                 Syndication Agent and as Issuing Bank

                                 By: /s/ CONSTANCE M. COLEMAN
                                     -------------------------------------------
                                      Name:  Constance M. Coleman
                                      Title: Vice President

                                 SALOMON SMITH BARNEY INC.,
                                 as Co-Documentation Agent

                                 By: /s/ JOHN DORANS
                                     -------------------------------------------
                                      Name:  John Dorans
                                      Title: Director

                                 LEHMAN BROTHERS, INC.,
                                 as Co-Documentation Agent

                                 By: /s/ G. ANDREW KEITH
                                     -------------------------------------------
                                      Name:  G. Andrew Keith
                                      Title: Authorized Signatory

                                 MERRILL LYNCH & CO., INC.,
                                 as Co-Documentation Agent

                                 By: /s/ BENJAMIN W. LAU
                                     -------------------------------------------
                                      Name:  Benjamin W. Lau
                                      Title: Vice President

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       5
<PAGE>

         BY SIGNING IN THE APPROPRIATE SPACE BELOW, THE UNDERSIGNED HEREBY
CONSENT TO THE FOREGOING AMENDMENT NO. 1 TO THE SIDE LETTER AND TO THE EXECUTION
THEREOF BY THE AGENTS AND THE ISSUING BANK.

                                 LENDERS:

                                 BANK OF AMERICA, N.A.

                                 By: /s/ JOHN W. WOODIEL III
                                    --------------------------------------------
                                     Name:  John W. Woodiel III
                                     Title: Managing Director

                                 JP MORGAN CHASE BANK
                                 (formerly The Chase Manhattan Bank)

                                 By: /s/ HOUSTON A. STUBBINS
                                    --------------------------------------------
                                     Name:  Houston A. Stubbins
                                     Title: Managing Director

                                 CITICORP USA, INC.

                                  By: /s/ JOHN DORANS
                                     -------------------------------------------
                                      Name:  John Dorans
                                      Title: Director

                                  LEHMAN COMMERCIAL PAPER INC.

                                  By: /s/ G. ANDREW KEITH
                                     -------------------------------------------
                                      Name:  G. Andrew Keith
                                      Title: Authorized Signatory

                                  MERRILL LYNCH CAPITAL CORPORATION

                                  By: /s/ BENJAMIN W. LAU
                                     -------------------------------------------
                                      Name:  Benjamin W. Lau
                                      Title: Vice President

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       6
<PAGE>

                                  ABN AMRO BANK N.V.

                                  By: /s/ NEIL J. BIVONA
                                     -------------------------------------------
                                      Name:  Neil J. Bivona
                                      Title: Group Vice President

                                  By: /s/ STEVEN C. WIMPENNY
                                     -------------------------------------------
                                      Name:  Steven C. Wimpenny
                                      Title: Group Senior Vice President

                                  BANK OF MONTREAL

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

                                  THE BANK OF NEW YORK

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

                                  BANK OF OKLAHOMA N.A.

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

                                  BANK ONE, N.A.

                                  By: /s/ THOMAS T. BOWER
                                     -------------------------------------------
                                      Name:  Thomas T. Bower
                                      Title: Senior Vice President

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       7
<PAGE>

                                  BAYERISCHE HYPOVEREINS BANK, NEW
                                  YORK BRANCH (formerly Bank Austria
                                  Creditanstalt Corporate Finance,
                                  Inc.)

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

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

                                  CIBC INC.

                                  By: /s/ JOAN S. GRIFFIN
                                     -------------------------------------------
                                      Name:  Joan S. Griffin
                                      Title: Executive Director,
                                             CIBC World Markets Corp.
                                             As Agent

                                  CREDIT LYONNAIS NEW YORK BRANCH

                                  By: /s/ JEREMY HORN
                                     -------------------------------------------
                                      Name:  Jeremy Horn
                                      Title: Authorized Signature

                                  CREDIT SUISSE FIRST BOSTON

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

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

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       8
<PAGE>

                                  DEUTSCHE BANK AG
                                  NEW YORK BRANCH AND/OR
                                  CAYMAN ISLANDS BRANCH

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

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

                                  FIRST UNION NATIONAL BANK

                                  By: /s/ MARK L. COOK
                                     -------------------------------------------
                                      Name:  Mark L. Cook
                                      Title: Senior Vice President

                                  FLEET NATIONAL BANK

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

                                  THE FUJI BANK, LIMITED

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

                                  IBM CREDIT CORPORATION

                                  By: /s/ STEVEN A. FLANAGAN
                                     -------------------------------------------
                                      Name:  Steven A. Flanagan
                                      Title: Manager Special Handling

                                  THE INDUSTRIAL BANK OF JAPAN, LIMITED,
                                  NEW YORK BRANCH

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

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       9
<PAGE>

                                  KBC BANK, N.V.

                                  By: /s/ ROBERT SNAUFFER
                                     -------------------------------------------
                                      Name:  Robert Snauffer
                                      Title: First Vice President

                                  By: /s/ ERIC RASKIN
                                     -------------------------------------------
                                      Name:  ERIC RASKIN
                                      Title: Vice President

                                  SCOTIABANC INC.

                                  By: /s/ W.J. BROWN
                                     -------------------------------------------
                                      Name:  W.J. Brown
                                      Title: Managing Director

                                  STANFIELD ARBITRAGE CDO, LTD.
                                  By:    Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                  STANFIELD CLO, LTD.
                                  By:    Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                  STANFIELD/RMF TRANSATLANTIC CDO, LTD
                                  By     Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       10
<PAGE>

                                  WINDSOR LOAN FUNDING, LIMITED
                                  By:    Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                  ARK II CLO 2001-I, LIMITED
                                  By:    Patriarch Partners II, LLC,
                                         its Collateral Manager

                                  By: /s/ DENNIS DOLAN
                                     -------------------------------------------
                                      Name:  Dennis Dolan
                                      Title: Authorized Signatory

                                  HAMILTON CDO, LTD.
                                  By:    Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

[AMENDMENT NO. 1 TO SIDE LETTER]

                                       11<PAGE>
                                                                  EXHIBIT 10.102

                         Amendment No. 2 to Side Letter

                                                    Dated as of January 28, 2002

         Reference is hereby made to the following:

                  (i) that certain letter agreement dated as of October 30,
         2001, as amended (the "Side Letter") between Williams Communications,
         LLC (the "Borrower") and Williams Communications Group, Inc.
         ("Holdings"), on the one hand, and Bank of America, as Administrative
         Agent and as Issuing Bank, JP Morgan Chase Bank (formerly The Chase
         Manhattan Bank), as Syndication Agent and as Issuing Bank, Salomon
         Smith Barney Inc., as Co-Documentation Agent, Lehman Brothers, Inc., as
         Co-Documentation Agent and Merrill Lynch & Co., Inc., as
         Co-Documentation Agent, on the other hand; and

                  (ii) that certain Amended and Restated Credit Agreement dated
         as of September 8, 1999 (as amended, the "Credit Agreement"), among the
         Borrower, Holdings, the lenders party thereto (the "Lenders"), Bank of
         America, N.A., as Administrative Agent for the Lenders (in such
         capacity, the "Administrative Agent"), JP Morgan Chase Bank, (formerly
         The Chase Manhattan Bank), as Syndication Agent, Salomon Smith Barney
         Inc. and Lehman Brothers, Inc., as Joint Lead Arrangers and Joint
         Bookrunners with respect to the Incremental Facility referred to
         therein, and Salomon Smith Barney Inc., Lehman Brothers, Inc. and
         Merrill Lynch & Co., Inc., as Co-Documentation Agents.

         Capitalized terms not otherwise defined herein are used herein as
defined in the Side Letter.

         The Borrower and Holdings have requested, and the Agents, the Issuing
Bank and the Required Lenders have agreed, to amend the Side Letter (subject to
the terms and conditions set forth herein).

         In consideration of the mutual agreements contained herein and other
good and valuable consideration the receipt of which is hereby acknowledged, the
parties hereto hereby agree as follows:

1.       The Side Letter is hereby amended as follows:

         (a) The introductory language at the beginning of Section 1 of the Side
Letter is hereby deleted in its entirety and the following text inserted in lieu
thereof:

         "As used in this letter agreement: (i) the term "Negotiation Period"
         shall mean the period beginning as of October 19, 2001 through and
         including February 28, 2002; and (ii) the term "Extended Period" shall
         mean the period beginning as of October 19, 2001 through and including
         June 30, 2003. During the Extended Period, each of the Loan Parties
         shall not, and shall not permit any Unrestricted Subsidiary to:"

         (b) Clause (iii)(y) appearing in the proviso in Section 1 of the Side
Letter is hereby deleted in its entirety.

         (c) The words "preliminary budget dated October 1, 2001" in the second
line of Section 2 of the Side Letter are hereby deleted and replaced by the
words "business plan dated January 11, 2002".

<PAGE>

         (d) The introductory language of Section 3 of the Side Letter is hereby
amended by deleting the word "Negotiation" appearing in the first line of such
Section 3 and inserting the word "Extended" in lieu thereof.

         (e) Section 3 (a) of the Side Letter is hereby amended by deleting the
words "or any Foreign Subsidiaries, except as expressly provided in clause
(iii)(y) of the proviso appearing in paragraph 1 above" appearing therein.

         (f) The first proviso at the end of Section 3 of the Side Letter is
hereby amended by inserting the words "and not otherwise prohibited" immediately
after the word "permitted" in the second line of such proviso.

         (g) The defined term "Negotiation Period" is hereby deleted each place
such term appears in Sections 4 and 5 of the Side Letter and the term "Extended
Period" inserted in lieu thereof.

         (h) The Side Letter is hereby amended to include the following new
Sections 6 and 7:

         "6. Notwithstanding anything to the contrary contained in this letter
         agreement, during the Negotiation Period, the Loan Parties hereby
         covenant and agree not to make any investment (including, without
         limitation, loans) in any Foreign Subsidiaries except for (A)
         investments not exceeding $12 million in the aggregate made by the Loan
         Parties in PowerTel Limited, Silica Networks, S.A. and/or Manquehue
         Net, S.A., provided that such investments are expressly permitted by
         the Credit Agreement, and (B) investments in Foreign Subsidiaries made
         in compliance with that certain Consent dated as of December 21, 2001,
         executed by the Loan Parties and the Agents.

         7. During the Negotiation Period, each of Holdings, the Borrower and
         the Agents shall continue their ongoing discussions relating to the
         business and operations of the Loan Parties. Holdings and the Borrower
         hereby further covenant and agree to provide to the Agents, not later
         than three (3) Business Days prior to the expiration of the Negotiation
         Period, a detailed comprehensive plan of financial restructuring and
         deleveraging for Holdings, the Borrower and the other Loan Parties."

2. This Amendment shall not become effective until the date (the "Amendment
Effective Date") on which (i) the Administrative Agent shall have received fully
executed counterparts hereof executed by the Loan Parties, the Issuing Bank and
all of the Agents, together with the consent of the Required Lenders to this
Amendment as set forth hereinbelow; and (ii) all legal matters incident to this
Amendment and the effects hereof or any of the Loan Documents shall be
reasonably satisfactory to the Agents and their counsel.

3. Each of the Loan Parties represents and warrants to the Agents and the
Lenders that (X) the execution, delivery and performance by the Loan Parties of
this Amendment and the performance by each of them of the Side Letter as
modified by this Amendment (i) have been duly authorized by all requisite
corporate, partnership or limited liability company action (as applicable) on
the part of each such Loan Party; and (ii) will not violate (a) any provision of
any statute, rule or regulation, or the Certificate of Incorporation or By-laws
(or similar governing documents) of any of the Loan Parties, (b) any applicable
order of any court or any rule, regulation or order of any other agency of
government or (c) any indenture, agreement or other instrument to which any of
the Loan Parties is a party or by which any of the Loan Parties or any of their
respective properties is bound, or be in conflict with, result in a breach of,
or constitute (with notice or lapse of time or both) a default under, any such
indenture, agreement, or other instrument; and (Y) upon the occurrence of the
Amendment Effective Date, this Amendment will

                                       2
<PAGE>

constitute the legal, valid and binding obligation of the Loan Parties,
enforceable in accordance with its terms, except as the enforceability thereof
may be limited by applicable bankruptcy, insolvency, reorganization or other
similar laws affecting creditors' rights generally and by general equitable
principles (regardless of whether the issue of enforceability is considered in a
proceeding in equity or at law).

4. The Loan Parties hereby agree that in the event any Loan Party or
Unrestricted Subsidiary shall fail to observe or perform any agreement set forth
in the Side Letter as amended by this Amendment, such event shall be an
immediate Event of Default under the Credit Agreement not requiring any notice,
lapse of time or other action on the part of any of the Agents or the Lenders;
and the Administrative Agent and/or the Required Lenders may exercise any and
all remedies it or they may have pursuant to any of the Loan Documents or other
applicable law.

5. The Borrower acknowledges and agrees that its obligations set forth in
Section 10.03 of the Credit Agreement include the preparation, execution and
delivery of this Amendment, and any other documentation contemplated hereby,
including, but not limited to, the reasonable fees and disbursements of Clifford
Chance Rogers & Wells LLP, counsel to the Administrative Agent, and PWC.

6. This Amendment shall be limited precisely as written and shall not be deemed
(i) to be a consent granted pursuant to, or a waiver or modification of, any
other term or condition of the Side Letter or any of the instruments or
agreements referred to therein or a waiver of any Default or Event of Default
under the Credit Agreement, whether or not known to the Agents or the Lenders or
(ii) to prejudice any right or rights which the Administrative Agent or the
Lenders may now have or have in the future under or in connection with any Loan
Document or any of the instruments or agreements referred to in a Loan Document.
The Administrative Agent (on behalf of itself and the Lenders) and the other
Agents hereby expressly reserve all of the Administrative Agent's, the other
Agents' and the Lenders' (as applicable) respective rights and remedies under
the Credit Agreement and each of the other Loan Documents, as well as under
applicable law. No failure to exercise, delay in exercising or any singular or
partial exercise, by the Administrative Agent, the Agents or any of the Lenders,
of any right, power or remedy hereunder or any of the other Loan Documents shall
operate as a waiver thereof, nor shall any of the Loan Documents (including,
without limitation, the Side Letter) be construed as a standstill or a
forbearance by any of the Agents or the Lenders of their rights and remedies
thereunder. Except to the extent hereby modified, the Side Letter shall continue
in full force and effect in accordance with the provisions thereof on the date
hereof and the Side Letter as modified by this Amendment is hereby ratified and
confirmed. As used in the Side Letter, the terms "Side Letter," "this
Agreement," "herein," "hereafter," "hereto," "hereof," and words of similar
import, shall, unless the context otherwise requires, mean the Side Letter as
modified by this Amendment. Reference to the terms "Side Letter" appearing in
the other Loan Documents shall, unless the context otherwise requires, mean the
Side Letter as modified by this Amendment. This Amendment shall be deemed to
have been jointly drafted, and no provision of it shall be interpreted or
construed for or against any party hereto because such party purportedly
prepared or requested such provision, any other provision, or this Amendment as
a whole.

7. This Amendment may be executed in any number of counterparts and by the
different parties hereto in separate counterparts, each of which when so
executed and delivered shall be deemed to be an original and all of which taken
together shall constitute but one and the same instrument. Delivery of an
executed signature page to this Amendment by facsimile shall be as effective as
delivery of a manually executed counterpart of this Amendment.

8. This Amendment is a Loan Document pursuant to the Credit Agreement and shall
(unless expressly indicated herein or therein) be construed, administered, and
applied, in accordance with all of the terms and provisions of the Credit
Agreement.

                                       3
<PAGE>

9. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
LAWS OF THE STATE OF NEW YORK WHICH ARE APPLICABLE TO CONTRACTS MADE AND TO BE
PERFORMED WHOLLY WITHIN THE STATE OF NEW YORK.

10. The provisions of this Amendment shall be binding upon, and inure to the
benefit of, the parties hereto and their respective successors and assigns.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                       4
<PAGE>

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

                                     BORROWER:

                                     WILLIAMS COMMUNICATIONS, LLC

                        [STAMP]      By:         /s/ HOWARD S. KALIKA
                                        ----------------------------------------
                                        Name:
                                        Title:

                                     HOLDINGS:

                                     WILLIAMS COMMUNICATIONS GROUP, INC.

                        [STAMP]         By:       /s/ HOWARD S. KALIKA
                                        ----------------------------------------
                                        Name:
                                        Title:

                                     SUBSIDIARY LOAN PARTIES:

                                     CRITICAL CONNECTIONS, INC.
                                     WCS COMMUNICATIONS SYSTEMS, INC.
                                     WCS, INC.
                                     WILLIAMS COMMUNICATIONS OF VIRGINIA, INC.
                                     WILLIAMS COMMUNICATIONS PROCUREMENT, L.L.C.
                                     WILLIAMS COMMUNICATIONS PROCUREMENT, LP
                                     WILLIAMS GLOBAL COMMUNICATIONS
                                       HOLDINGS, INC.
                                     WILLIAMS INTERNATIONAL VENTURES COMPANY
                                     WILLIAMS LEARNING NETWORK, INC.
                                     WILLIAMS LOCAL NETWORK, LLC
                                     WILLIAMS TECHNOLOGY CENTER, LLC
                                     WILLIAMS COMMUNICATIONS AIRCRAFT, LLC
                                     WILLIAMS COMMUNICATIONS MANAGED
                                       SERVICES, LLC

                        [STAMP]         By:       /s/ HOWARD S. KALIKA
                                        ----------------------------------------
                                        Name:
                                        Title:

                                      5

[AMENDMENT NO. 2  TO SIDE LETTER]

<PAGE>

                                     ISSUING BANK AND AGENTS:

                                     BANK OF AMERICA, N.A., as Administrative
                                     Agent and as Issuing Bank

                                     By:   /s/ PATRICK HONEY
                                        ----------------------------------------
                                        Name:  Patrick Honey
                                        Title: Vice President

                                     JP MORGAN CHASE BANK
                                     (formerly The Chase Manhattan Bank), as
                                     Syndication Agent and as Issuing Bank

                                     By:   /s/ HOUSTON A. STUBBINS
                                        ----------------------------------------
                                        Name:  Houston A. Stubbins
                                        Title: Managing Director

                                     SALOMON SMITH BARNEY INC.,
                                     as Co-Documentation Agent

                                     By:   /s/ JOHN DORANS
                                        ----------------------------------------
                                        NAME:  John Dorans
                                        Title: [ILLEGIBLE]

                                     LEHMAN BROTHERS, INC.,
                                     as Co-Documentation Agent

                                     By:   /s/ [ILLEGIBLE]
                                        ----------------------------------------
                                        Name:  [ILLEGIBLE]
                                        Title: Senior Vice President

                                     MERRILL LYNCH & CO., INC.,
                                     as Co-Documentation Agent

                                     By:   /s/ ZORAN FOTAK
                                        ----------------------------------------
                                        Name:  Zoran Fotak
                                        Title: Managing Director

                                        6

[AMENDMENT NO. 2  TO SIDE LETTER]

<PAGE>

         BY SIGNING IN THE APPROPRIATE SPACE BELOW, THE UNDERSIGNED HEREBY
CONSENT TO THE FOREGOING AMENDMENT NO. 2 TO THE SIDE LETTER AND TO THE EXECUTION
THEREOF BY THE AGENTS AND THE ISSUING BANK.

                                     LENDERS:

                                     BANK OF AMERICA, N.A.

                                     By:   /s/ PATRICK HONEY
                                        ----------------------------------------
                                        Name:  Patrick Honey
                                        Title: Vice President

                                     JP MORGAN CHASE BANK
                                     (formerly The Chase Manhattan Bank)

                                     By:   /s/ HOUSTON A. STUBBINS
                                        ----------------------------------------
                                        Name:  Houston A. Stubbins
                                        Title: Managing Director

                                     CITICORP USA, INC.

                                     By:   /s/ JOHN DORANS
                                        ----------------------------------------
                                        Name:  John Dorans
                                        Title: [ILLEGIBLE]

                                     LEHMAN COMMERCIAL PAPER INC.

                                     By:   /s/ [ILLEGIBLE]
                                        ----------------------------------------
                                        Name:  [ILLEGIBLE]
                                        Title: Authorized Signatory

                                     MERRILL LYNCH CAPITAL CORPORATION

                                     By:   /s/ ZORAN FOTAK
                                        ----------------------------------------
                                        Name:  Zoran Fotak
                                        Title: Vice President

                                       7

[AMENDMENT NO. 2  TO SIDE LETTER]

<PAGE>

                                     ABN AMRO BANK N.V.

                                     By: /s/ NEIL J. BIVONA
                                        ----------------------------------------
                                        Name: NEIL J. BIVONA
                                        Title: GROUP VICE PRESIDENT

                                     By: /s/ STEVEN C. WIMPENNY
                                        ----------------------------------------
                                        Name: STEVEN C. WIMPENNY
                                        Title: GROUP SENIOR VICE PRESIDENT

                                     BANK OF MONTREAL

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

                                     THE BANK OF NEW YORK

                                     By: /s/ JULIE B. FOLLOSCI
                                        ----------------------------------------
                                        Name: JULIE B. FOLLOSCI
                                        Title: VICE PRESIDENT

                                     BANK OF OKLAHOMA N.A.

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

                                     BANK ONE, N.A.

                                     By: /s/ THOMAS T. BOWER
                                        ----------------------------------------
                                        Name: THOMAS T. BOWER
                                        Title: SENIOR VICE PRESIDENT

                                       8

[AMENDMENT NO. 2  TO SIDE LETTER]

<PAGE>

                                     BAYERISCHE HYPOVEREINS BANK, NEW YORK
                                     BRANCH (formerly Bank Austria Creditanstalt
                                     Corporate Finance, Inc.)

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

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

                                     CIBC INC.

                                     By: /s/ JOAN S. GRIFFIN
                                        ----------------------------------------
                                        Name: Joan S. Griffin
                                        Title: EXECUTIVE DIRECTOR

                                     CREDIT LYONNAIS NEW YORK BRANCH

                                     By: /s/ JEREMY HORN
                                        ----------------------------------------
                                        Name: Jeremy Horn
                                        Title: VICE PRESIDENT

                                     CREDIT SUISSE FIRST BOSTON

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

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

                                       9

[AMENDMENT NO. 2  TO SIDE LETTER]

<PAGE>

                                     DEUTSCHE BANK AG
                                     NEW YORK BRANCH AND/OR
                                     CAYMAN ISLANDS BRANCH

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

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

                                     FIRST UNION NATIONAL BANK

                                     By: /s/ MARK L. COOK
                                        ----------------------------------------
                                        Name: Mark L. Cook
                                        Title: SENIOR VICE PRESIDENT

                                     FLEET NATIONAL BANK

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

                                     THE FUJI BANK, LIMITED

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

                                     IBM CREDIT CORPORATION

                                     By: /s/ STEVEN A. FLANAGAN
                                        ----------------------------------------
                                        Name: Steven A. Flanagan
                                        Title: MANAGER, SPECIAL HANDLING

                                     THE INDUSTRIAL BANK OF JAPAN, LIMITED,
                                     NEW YORK BRANCH

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

                                       10

[AMENDMENT NO. 2  TO SIDE LETTER]

<PAGE>

                                     KBC BANK, N.V.

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

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

                                     SCOTIABANC INC.

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

                                     STANFIELD ARBITRAGE CDO, LTD.
                                     By: Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                     STANFIELD CLO, LTD.
                                     By: Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                     STANFIELD/RMF TRANSATLANTIC CDO, LTD
                                     By: Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                       11

[AMENDMENT NO. 2  TO SIDE LETTER]

<PAGE>

                                     WINDSOR LOAN FUNDING, LIMITED
                                     By: Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                     ARK II CLO 2001-I, LIMITED
                                     By: Patriarch Partners II, LLC,
                                         its Collateral Manager

                                     By: /s/ LYNN TILTON
                                        ----------------------------------------
                                        Name: Lynn Tilton
                                        Title: AUTHORIZED DIGNATORY

                                     HAMILTON CDO, LTD.
                                     By: Stanfield Capital Partners LLC
                                         as its Collateral Manager

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

                                       12

[AMENDMENT NO. 2  TO SIDE LETTER]

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