Document:

<PAGE>
                                                                  EXHIBIT 10.103

                         Amendment No. 3 to Side Letter

                                                   Dated as of February 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, N.A., 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., 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., as Co-Documentation Agents.

         Capitalized terms not otherwise defined herein are used herein as
defined in the Side Letter or the Credit Agreement, as applicable.

         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 of the Amendment Effective Date (as such
term is defined in Section 2 below) as follows:

         (a) Clause (i) of the first paragraph of Section 1 of the Side Letter
is hereby amended by deleting the date "February 28, 2002" appearing therein and
inserting the date "March 27, 2002" in lieu thereof.

         (b) Clause (i) of the proviso appearing in the second sentence of
Section 1 of the Side Letter is hereby amended by inserting the words "and not
otherwise prohibited by this letter agreement" at the end thereof, immediately
after the words "Credit Agreement", but immediately before the semicolon.

<PAGE>

         (c) Section 2 of the Side Letter is hereby amended in its entirety to
read as follows:

                  "2. During the Negotiation Period, the Borrower, Holdings and
                  their subsidiaries shall, subject to the restrictions and
                  other provisions of this letter agreement, fund their business
                  and operations in accordance with the business plan dated
                  January 11, 2002, as modified by (a) the cash flow projections
                  delivered weekly by the Loan Parties pursuant to Section 9 of
                  this letter agreement, and (b) the business plan delivered by
                  the Loan Parties pursuant to Section 10 of this letter
                  agreement, provided that such business plan is reasonably
                  satisfactory in form and substance to the Administrative Agent
                  and PWC."

         (d) Section 3(c) of the Side Letter is hereby amended in its entirety
to read as follows:

                  "(c) shall not permit any Unrestricted Subsidiary to purchase,
                  acquire or otherwise hold any Investment, other than existing
                  Investments listed on Schedule 1 hereto and Investments in
                  cash and cash equivalents, subject to and in accordance with
                  the terms of this letter agreement; and shall not permit any
                  Unrestricted Subsidiary to incur, create, assume or suffer to
                  exist any Indebtedness, other than existing Indebtedness
                  listed on Schedule 1 hereto, and"

         (e) Section 3(d) of the Side Letter is hereby amended in its entirety
to read as follows:

                  "(d) shall not permit the Unrestricted Subsidiaries to hold at
                  any time an aggregate amount in excess of $5,000,000 of cash
                  and cash equivalents (the "Permitted Basket"); it being
                  understood that (w) there shall not be a default under this
                  provision so long as any amounts in excess of such $5,000,000
                  limit are remitted to the Borrower in compliance with the
                  provisions of paragraph 4 below; (x) the Permitted Basket
                  shall not include any additional investment in any
                  Unrestricted Subsidiary by Holdings, the Borrower or any other
                  Loan Party; (y) nothing herein shall prevent the Unrestricted
                  Subsidiaries from liquidating any existing Investments held by
                  them, and any net loss from the liquidation of such
                  Investments shall be charged against the Permitted Basket; and
                  (z) the Permitted Basket is to be used by the Unrestricted
                  Subsidiaries for their operations and any cash, cash
                  equivalents and proceeds of investments received after the
                  date hereof shall be remitted to the Borrower pursuant to
                  paragraph 4 below."

         (f) The two (2) provisos appearing at the end of Section 3 of the Side
Letter are hereby deleted in their entirety.

         (g) Section 4 of the Side Letter is hereby amended in its entirety to
read as follows:

                  "4. During the Extended Period, in the event that either (a)
                  the aggregate amount of cash and cash equivalents held by the
                  Unrestricted Subsidiaries exceeds $5,000,000 minus the amount
                  of any net loss charged against the Permitted Basket pursuant
                  to paragraph 3(d) above, or (b) any interest payment is made
                  by Holdings and/or the Borrower to an Unrestricted Subsidiary
                  that has purchased or otherwise holds indebtedness issued by
                  Holdings and/or the Borrower, or (c) any amount is required to
                  be remitted to the Borrower pursuant to paragraph 3 above,
                  then Holdings and/or the Borrower (as applicable) shall,
                  within two (2) Business Days of any such event (x) cause
                  Unrestricted Subsidiaries to remit to the Borrower cash in the
                  amount necessary so that the aggregate amount of cash and cash
                  equivalents held by the Unrestricted Subsidiaries does not
                  exceed $5,000,000 minus the amount of any net loss charged
                  against the Permitted Basket pursuant to paragraph 3(d) above
                  and/or (y) cause the applicable

                                       2

<PAGE>

                  Unrestricted Subsidiary to remit to the Borrower any such
                  interest payment received by such Unrestricted Subsidiary or
                  other amount required to be remitted to the Borrower. All cash
                  received by the Borrower pursuant to the immediately preceding
                  sentence shall be deposited by the Borrower in one or more
                  Controlled Deposit Accounts (such term being used herein as
                  defined in the Security Agreement)."

         (h) Section 5 of the Side Letter is hereby amended by deleting the
words "any investments or any other" and inserting the word "all" in lieu
thereof.

         (i) The second sentence of Section 7 of the Side Letter is hereby
deleted in its entirety.

         (j) The Side Letter is hereby amended to include the following new
Sections 8, 9, 10, 11, 12 and 13:

                  "8. The Borrower and each of the Restricted Subsidiaries
                  hereby agree that during the remainder of the Negotiation
                  Period, it shall not declare or make, or agree to pay or make,
                  directly or indirectly, any Restricted Payment to, or for the
                  benefit of, Holdings, or enter into any transaction the
                  economic effect of which is substantially similar to a
                  Restricted Payment to, or for the benefit of, Holdings.

                  9. The Loan Parties hereby agree to deliver to the Agents and
                  PricewaterhouseCoopers LLP ("PWC"), no later than the fourth
                  Business Day of each calendar week: (a) a 13-week cash flow
                  projection commencing with the calendar week in which such
                  projection is delivered, and (b) a comparison of actual cash
                  flows to the projected cash flows and a variance analysis for
                  the calendar week ended immediately prior to the most recently
                  completed calendar week, in each case in form and substance
                  reasonably satisfactory to the Administrative Agent and PWC.
                  The Loan Parties hereby further agree that the initial
                  delivery of the foregoing information to the Agents and PWC
                  shall be made on March 26, 2002, and shall commence with the
                  calendar week of March 25, 2002.

                  10. The Loan Parties hereby agree to deliver to the Agents and
                  PWC, on or prior to March 11, 2002, a detailed comprehensive
                  business plan updating the business plan dated January 11,
                  2002.

                  11. The Loan Parties hereby represent and warrant that
                  attached hereto as Schedule 2 is a true and complete list of
                  all Deposit Accounts and Securities Accounts (such terms are
                  being used herein as defined in the Security Agreement) held
                  by any Loan Party. The Loan Parties hereby agree that, during
                  the Negotiation Period, they will not establish, or take any
                  action to establish, any new Deposit Account or Security
                  Account without the prior written consent of the
                  Administrative Agent, which consent may be withheld by the
                  Administrative Agent in its sole discretion.

                  12. The Loan Parties hereby represent and warrant that
                  attached hereto as Schedule 3 is a true and complete list of
                  all obligations and liabilities (contingent or otherwise) owed
                  by a Loan Party or any other Subsidiary to The Williams
                  Companies, Inc. ("TWC").

                  13. Holdings has advised the Agents that TWC has agreed,
                  pursuant to that certain letter agreement dated as of February
                  23, 2002 between Holdings and TWC (a true and complete copy of
                  which has been delivered by Holdings to the Administrative
                  Agent) (the "TWC Letter"), to make all required interest
                  payments for the period from February 23, 2002 through and
                  including September 30, 2002, with respect to the 8.25% Senior

                                       3
<PAGE>

                  Reset Notes due 2008 of Holdings (the "Reset Notes") issued
                  pursuant to that certain Indenture dated as of March 28, 2001
                  between Holdings and United States Trust Company of New York
                  as Trustee. Holdings hereby covenants and agrees as follows:

                           (i)      in the event that TWC fails to perform its
                                    obligations under the TWC Letter, prior to
                                    making any payments with respect to the
                                    Reset Notes, Holdings shall (x) promptly
                                    exercise and diligently prosecute and
                                    pursue, at least until (but not including)
                                    the last Business Day preceding the
                                    expiration of any grace period applicable to
                                    such payment, all rights and remedies
                                    Holdings may have against TWC under or
                                    pursuant to the TWC Letter, applicable law
                                    or otherwise, and (y) shall avail itself of
                                    and exhaust all time available up to (but
                                    not including) the last Business Day
                                    preceding the expiration of any grace period
                                    applicable to such payment;

                           (ii)     Holdings shall not permit any other Loan
                                    Party to make, and no other Loan Party is
                                    obligated to make, any payment on behalf of
                                    Holdings in respect of the Reset Notes
                                    during the Negotiation Period;

                           (iii)    neither Holdings nor any other Loan Party is
                                    obligated to make, nor shall make, any
                                    payments during the Negotiation Period with
                                    respect to the 8.25% Senior Secured Notes
                                    due 2004 of WCG Note Trust, as Issuer and
                                    WCG Note Corp., Inc., as Co-Issuer (the
                                    "8.25% Senior Secured Notes") issued
                                    pursuant to that certain Indenture dated as
                                    of March 28, 2001 among WCG Note Trust, WCG
                                    Note Corp., Inc. and United States Trust
                                    Company of New York as Indenture Trustee and
                                    Securities Intermediary;

                           (iv)     during the Negotiation Period, Holdings will
                                    not agree to any amendment or other
                                    modification of Section 6 of the TWC Letter
                                    without the prior written consent of the
                                    Administrative Agent; and

                           (v)      Holdings shall deliver to the Administrative
                                    Agent prior written notice (at the address
                                    set forth below the Administrative Agent's
                                    name on the signature pages hereto) at least
                                    5 Business Days before Holdings or any other
                                    Loan Party makes any payment with respect to
                                    the Reset Notes, the 8.25% Senior Secured
                                    Notes, or any of the transactions related
                                    to, or contemplated by, the Structured Note
                                    Financing (and Holdings hereby represents
                                    and warrants that no such payments are due
                                    and payable by Holdings or the other Loan
                                    Parties during the Negotiation Period, other
                                    than the scheduled interest payment on the
                                    Reset Notes).

                  Holdings hereby represents and warrants that the grace period
                  with respect to interest payments on the Reset Notes is a
                  period of 30 days.

         (k) The Side Letter is hereby amended by adding the Schedules 1, 2 and
3 attached hereto at the end of the Side Letter, immediately after the signature
pages.

2. This Amendment shall not become effective until the date on which the
following conditions precedent shall have been satisfied, or waived by the
Issuing Bank, the Agents and the Required Lenders in writing (such date being
referred to herein as the "Amendment Effective Date"):

         (a)      the Administrative Agent shall have received fully executed
                  counterparts of this Amendment 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;

                                       4
<PAGE>

         (b)      The Williams Companies, Inc. ("TWC") shall have agreed,
                  unconditionally and in writing, to defer until September 15,
                  2002 or later, the payment by Holdings of all principal and
                  interest in respect of the $100 million receivable scheduled
                  for payment to TWC in March 2002; and the Administrative Agent
                  shall have received a fully executed copy of such deferral
                  agreement;

         (c)      the Administrative Agent shall have received a certificate
                  from a Financial Officer of Holdings on behalf of Holdings,
                  setting forth (i) a schedule (in a form reasonably
                  satisfactory to the Administrative Agent) of the aggregate
                  cash balances on December 31, 2001 and on February 22, 2002 of
                  (X) the Loan Parties and (Y) the Unrestricted Subsidiaries,
                  and (ii) the uses of cash by Holdings and its Subsidiaries on
                  a consolidated basis during the period from January 1, 2002 to
                  February 22, 2002;

         (d)      all cash and cash equivalents held by Unrestricted
                  Subsidiaries in excess of an aggregate amount equal to
                  $5,000,000 shall be remitted to the Borrower and deposited by
                  the Borrower in one or more Controlled Deposit Accounts (as
                  such term is defined in the Security Agreement);

         (e)      all fees and other charges presently due and payable to the
                  Administrative Agent or any Lender pursuant to any Loan
                  Document shall have been paid by the Borrower;

         (f)      all out-of-pocket expenses incurred by the Agents and invoiced
                  by February 28, 2002 in connection with the Credit Agreement,
                  this Amendment, the Side Letter, any other Loan Document or
                  the transactions contemplated by any of the foregoing
                  (including, without limitation, the reasonable fees and
                  disbursements of Clifford Chance Rogers & Wells LLP, Davis
                  Polk & Wardwell, Shearman & Sterling, Simpson Thacher &
                  Bartlett and PricewaterhouseCoopers LLP ("PWC")), shall have
                  been paid by the Borrower;

         (g)      Shearman & Sterling and Simpson Thacher & Bartlett shall each
                  have received a retainer in the amount of $100,000 in
                  accordance with the terms of any applicable engagement or
                  retainer letters; and

         (h)      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 or (b) any
applicable order of any court or any rule, regulation or order of any other
agency of government; 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).

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

                                       5
<PAGE>

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 HEREBY (A) CONFIRMS AND ACKNOWLEDGES TO THE ADMINISTRATIVE AGENT
AND THE LENDERS THAT IT IS VALIDLY AND JUSTLY INDEBTED TO THE ADMINISTRATIVE
AGENT AND THE LENDERS FOR THE PAYMENT OF ALL OBLIGATIONS (AS DEFINED IN THE
CREDIT AGREEMENT) WITHOUT OFFSET, DEFENSE, CAUSE OF ACTION OR COUNTERCLAIM OF
ANY KIND OR NATURE WHATSOEVER AND (B) REAFFIRMS AND ADMITS THE VALIDITY AND
ENFORCEABILITY OF THE CREDIT AGREEMENT AND THE LOAN DOCUMENTS AND THE LIENS IN
THE COLLATERAL WHICH WERE GRANTED PURSUANT TO ANY OF THE LOAN DOCUMENTS OR
OTHERWISE. EACH OF THE LOAN PARTIES, ON ITS OWN BEHALF AND ON BEHALF OF ITS
SUCCESSORS AND ASSIGNS, HEREBY WAIVES, RELEASES AND DISCHARGES EACH AGENT AND
EACH LENDER AND ALL OF THE AFFILIATES OF EACH AGENT AND EACH LENDER, AND ALL OF
THE DIRECTORS, OFFICERS, EMPLOYEES, ATTORNEYS, AGENTS, SUCCESSORS AND ASSIGNS OF
EACH AGENT, EACH LENDER AND SUCH AFFILIATES, FROM ANY AND ALL CLAIMS, DEMANDS,
ACTIONS OR CAUSES OF ACTION (KNOWN AND UNKNOWN) ARISING OUT OF OR IN ANY WAY
RELATING TO ANY OF THE LOAN DOCUMENTS AND ANY DOCUMENTS, AGREEMENTS, DEALINGS OR
OTHER MATTERS CONNECTED WITH ANY OF THE LOAN DOCUMENTS, IN EACH CASE TO THE
EXTENT ARISING (X) ON OR PRIOR TO THE DATE HEREOF OR (Y) OUT OF, OR RELATING TO,
ACTIONS, DEALINGS OR MATTERS OCCURRING ON OR PRIOR TO THE DATE HEREOF.

6. HOLDINGS AND EACH SUBSIDIARY LOAN PARTY HEREBY (A) CONFIRMS AND AGREES THAT
ITS GUARANTEE PURSUANT TO THE CREDIT AGREEMENT OR SUBSIDIARY GUARANTEE (AS
APPLICABLE) IS, AND SHALL CONTINUE TO BE, IN FULL FORCE AND EFFECT AND IS HEREBY
CONFIRMED AND RATIFIED IN ALL RESPECTS; (B) CONFIRMS AND ACKNOWLEDGES THAT IT IS
VALIDLY AND JUSTLY INDEBTED TO THE ADMINISTRATIVE AGENT AND THE LENDERS FOR THE
PAYMENT OF ALL OF THE OBLIGATIONS WHICH IT HAS GUARANTEED, WITHOUT OFFSET,
DEFENSE, CAUSE OF ACTION OR COUNTERCLAIM OF ANY KIND OF NATURE WHATSOEVER; AND
(C) REAFFIRMS AND ADMITS THE VALIDITY AND ENFORCEABILITY OF THE CREDIT AGREEMENT
AND THE LOAN DOCUMENTS TO WHICH IT IS A PARTY AND THE LIENS IN THE COLLATERAL
WHICH WERE GRANTED BY IT PURSUANT TO ANY OF THE LOAN DOCUMENTS OR OTHERWISE.

7. 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, Simpson Thacher
& Bartlett, counsel to the Syndication Agent, Shearman and Sterling, counsel to
the Co-Documentation Agents, and PWC.

8. 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

                                       6
<PAGE>

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.

9. 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.

10. Any provision of this Amendment which is invalid, illegal or unenforceable
under the applicable law of any jurisdiction, shall, as to such jurisdiction, be
ineffective to the extent of such invalidity, illegality or unenforceability
without invalidating the remaining provisions hereof, and any such invalidity,
illegality or unenforceability in any jurisdiction shall not invalidate such
provision in any other jurisdiction.

11. No failure on the part of the Administrative Agent, the Issuing Bank or any
Lender to exercise, and no delay in exercising, any right, power or remedy under
this Amendment shall operate as a waiver thereof, nor shall any single or
partial exercise of any right, power or remedy hereunder preclude any other or
further exercise thereof or the exercise of any other right, power or remedy
whether provided in any Loan Document or otherwise. All remedies hereunder are
cumulative and are not exclusive of any other remedies under any other Loan
Document or provided by applicable law.

12. All references herein to any of the parties to this Amendment shall be
deemed to include the successors and assigns of such party; provided, however,
that none of the Loan Parties may assign any of its rights or obligations
hereunder or under the Side Letter without the prior written consent of the
Agents, the Issuing Bank and all of the Lenders, and all covenants, promises and
agreements by or on behalf of any of the Loan Parties which are contained herein
shall inure to the benefit of each of the Lenders and to the successors and
assigns of any of the Agents, the Issuing Bank and any of the Lenders.

13. 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.

                                       7
<PAGE>

14. 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.

15. 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]

                                       8
<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:  Howard S. Kalika
                                      Title: Senior Vice President and Treasurer

                                   HOLDINGS:

                                   WILLIAMS COMMUNICATIONS GROUP, INC.

                 [STAMP]           By:       /s/ HOWARD S. KALIKA
                                      ----------------------------------------
                                      Name:  Howard S. Kalika
                                      Title: Senior Vice President and Treasurer

                                   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:  Howard S. Kalika
                                      Title: Senior Vice President and Treasurer

                                       9

[AMENDMENT NO. 3  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
                                        Address: Bank of America, N.A.
                                                 901 Main Street, 66th Floor
                                                 Dallas, TX  75202-3714
                                                 Attention: Jack Woodiel
                                                 Fax No.: (214) 209-3533

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

                                     By: /s/ HOUSTON A. STEBBINS
                                        ----------------------------------------
                                        Name: Houston A. Stebbins
                                        Title: MANAGING DIRECTOR

                                     SALOMON SMITH BARNEY INC.,
                                     as Co-Documentation Agent

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

                                     LEHMAN BROTHERS, INC.,
                                     as Co-Documentation Agent

                                     By: /s/ G. ANDREW KEITH
                                        ----------------------------------------
                                        Name: G. Andrew Keith
                                        Title: AUTHORIZED SIGNATORY

                                     MERRILL LYNCH & CO.
                                     as Co-Documentation Agent

                                     By: /s/ CAROL J.E. FEELEY
                                        ----------------------------------------
                                        Name: Carol J.E. Feeley
                                        Title: DIRECTOR

                                       10

[AMENDMENT NO. 3  TO SIDE LETTER]

<PAGE>

         BY SIGNING IN THE APPROPRIATE SPACE BELOW, THE UNDERSIGNED HEREBY
CONSENT TO THE FOREGOING AMENDMENT NO. 3 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/ G. ANDREW KEITH
                                        ----------------------------------------
                                        Name:  G. Andrew Keith
                                        Title: Authorized Signatory

                                     MERRILL LYNCH CAPITAL CORPORATION

                                     By: /s/ CAROL J.E. FEELEY
                                        ----------------------------------------
                                        Name:  Carol J.E. Feeley
                                        Title: Vice President

                                       11

[AMENDMENT NO. 3  TO SIDE LETTER]

<PAGE>

                                     ABN AMRO BANK N.V.

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

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

                                     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. BOWEN
                                        ----------------------------------------
                                        Name: Thomas T. Bowen
                                        Title: SENIOR VICE PRESIDENT

                                       12

[AMENDMENT NO. 3  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:
                                        ----------------------------------------
                                        Name:
                                        Title:

                                     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:

                                       13

[AMENDMENT NO. 3  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/ TOM BOLIVER
                                        ----------------------------------------
                                        Name:  Tom Boliver
                                        Title: DIRECTOR

                                     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, GLOBAL SPECIAL HANDLING

                                       14

[AMENDMENT NO. 3  TO SIDE LETTER]

<PAGE>

                                     THE INDUSTRIAL BANK OF JAPAN, LIMITED,
                                     NEW YORK BRANCH

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

                                     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:
                                        ----------------------------------------
                                        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:

                                       15

[AMENDMENT NO. 3  TO SIDE LETTER]

<PAGE>

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

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

                                     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 SIGNATORY

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

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

                                     CONTRARIAN FUNDS, LLC
                                     By: Contrarian Capital Management, LLC
                                         as Manager

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

                                       16

[AMENDMENT NO. 3  TO SIDE LETTER]

<PAGE>

                                     PACIFICA PARTNERS I, L.P.
                                     By: Imperial Credit Asset Management
                                         as Investment Manager

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

                                     SANKATY HIGH YIELD ASSET PARTNERS

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

                                     SANKATY HIGH YIELD PARTNERS II LP

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

                                     PEQUOD INVESTEMENTS L.P.

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

                                     CERBERUS PARTNERS, L.P.
                                     By: Cerberus Associates, L.L.C.
                                         its General Partner

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

                                       17

[AMENDMENT NO. 3  TO SIDE LETTER]<PAGE>
                                                                  EXHIBIT 10.104

                         Amendment No. 4 to Side Letter

                                                      Dated as of March 27, 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, N.A., 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., 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., as Co-Documentation Agents.

         Capitalized terms not otherwise defined herein are used herein as
defined in the Side Letter or the Credit Agreement, as applicable.

         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 of the Amendment Effective Date (as such
term is defined in Section 3 below) as follows:

         (a) Clause (i) of the first paragraph of Section 1 of the Side Letter
is hereby amended by deleting the date "March 27, 2002" appearing therein and
inserting the date "April 26, 2002" in lieu thereof.

         (b) Section 2 of the Side Letter is hereby amended in its entirety to
read as follows:

                  "2. During the Negotiation Period, the Borrower, Holdings and
                  their subsidiaries shall, subject to the restrictions and
                  other provisions of this letter agreement, fund their business
                  and operations in accordance with the business plan dated
                  March, 2002 and

<PAGE>

                  delivered to PricewaterhouseCoopers LLP on March 11, 2002, as
                  such business plan shall be modified by the cash flow
                  projections delivered weekly by the Loan Parties pursuant to
                  Section 9 of this letter agreement; provided that such cash
                  flow projections are reasonably satisfactory in form and
                  substance to the Administrative Agent and PWC."

         (c)      Section 9 of the Side Letter is hereby amended in its entirety
                  to read as follows:

                  "9. The Loan Parties hereby agree to deliver to the Agents and
                  PricewaterhouseCoopers LLP ("PWC") on April 11, 2002, (a) an
                  update of the 13-week cash flow projection previously
                  delivered to PWC on March 26, 2002, which update shall cover a
                  period commencing with the calendar week beginning on April 8,
                  2002, and ending with the same final week as the original
                  13-week cash flow projection; and (b) a comparison of actual
                  cash flows to the projected cash flows and a variance analysis
                  for the two (2) calendar weeks ended immediately prior to
                  April 8, 2002, both on a week by week basis and on a
                  cumulative basis, in each case in form and substance
                  reasonably satisfactory to the Administrative Agent and PWC.

                  The Loan Parties hereby agree to deliver to the Agents and PWC
                  on April 4, 2002 and on April 11, 2002, a true and complete
                  list of all Deposit Accounts and Securities Accounts (such
                  terms are being used herein as defined in the Security
                  Agreement) or other similar accounts or instruments held by
                  any Loan Party and including the following information: the
                  correct legal name of the institution where such account is
                  maintained, the Loan Party in whose name the account is
                  maintained, the account number and the balance (which may not
                  include interest income) as of the end of the immediately
                  preceding calendar week (such list to be in a form reasonably
                  satisfactory to the Administrative Agent and PWC) and
                  including a representation and warranty that to the extent
                  required by the Loan Documents, all such Deposit Accounts,
                  Securities Accounts, other accounts and instruments have been
                  pledged to the Administrative Agent (for the benefit of itself
                  and the Secured Parties (as defined in the Security
                  Agreement)).

                  The Loan Parties hereby agree to deliver to the Agents and
                  PWC, for each calendar week commencing on or after April 15,
                  2002, no later than the fourth Business Day of such calendar
                  week, (a) a cash flow projection covering a period beginning
                  with such calendar week through and including the calendar
                  week that is nine (9) weeks after the next scheduled
                  Re-forecast Date (as such term is defined below); (b) a
                  comparison of actual cash flows to the projected cash flows
                  and a variance analysis for the calendar week ended
                  immediately prior to such calendar week; and (c) a true and
                  complete list of all Deposit Accounts and Securities Accounts
                  (such terms are being used herein as defined in the Security
                  Agreement) or other similar accounts or instruments held by
                  any Loan Party and including the following information: the
                  correct legal name of the institution where such account is
                  maintained, the Loan Party in whose name the account is
                  maintained, the account number and the balance (which may not
                  include interest income) as of the end of the immediately
                  preceding calendar week and including a representation and
                  warranty that to the extent required by the Loan Documents,
                  all such Deposit Accounts, Securities Accounts, other accounts
                  and instruments have been pledged to the Administrative Agent
                  (for the benefit of itself and the Secured Parties (as defined
                  in the Security Agreement)) (all of the foregoing information
                  shall, in each case, be in form and substance reasonably
                  satisfactory to the Administrative Agent and PWC). As used
                  herein

                                       2
<PAGE>

                  the term "Re-forecast Date" shall mean April 25, 2002, and
                  each Thursday thereafter occurring in intervals of four (4)
                  weeks.

                  The Loan Parties hereby further agree to deliver to the Agents
                  and PWC, within fifteen (15) Business Days after the end of
                  each calendar month, a copy of the summary of monthly
                  consolidated financial information for Holdings and its
                  Subsidiaries in the form presented to Holdings' management
                  (which information is subject to normal quarterly and year-end
                  adjustment)."

         (d)      The Side Letter is hereby amended to include the following new
                  Section 14:

                  "14. Holdings has advised the Agents that the next scheduled
                  interest payment date with respect to Holdings' 10.70% Senior
                  Redeemable Notes due 2007 and 10.875% Senior Redeemable Notes
                  due 2009 (collectively, the "Senior Redeemable Notes") issued
                  pursuant to that certain Indenture dated as of October 6, 1999
                  between Holdings and The Bank of New York as trustee (the
                  "Indenture"), is April 1, 2002. In connection therewith,
                  Holdings hereby covenants and agrees as follows:

                           (i)      Holdings shall avail itself of, and exhaust,
                                    all time available up to (but not including)
                                    the last Business Day preceding the
                                    expiration of any grace period applicable to
                                    such payment;

                           (ii)     Holdings shall not permit any other Loan
                                    Party to make (and each other Loan Party
                                    agrees not to make), and no other Loan Party
                                    is obligated to make, any payment on behalf
                                    of Holdings in respect of the Senior
                                    Redeemable Notes during the Negotiation
                                    Period;

                           (iii)    during the Negotiation Period, Holdings will
                                    not agree to any amendment or other
                                    modification of the Indenture other than to
                                    effect a replacement of the trustee
                                    thereunder, without the prior written
                                    consent of the Administrative Agent; and

                           (iv)     Holdings shall deliver to the Administrative
                                    Agent prior written notice (at the address
                                    set forth below the Administrative Agent's
                                    name on the signature pages hereto) at least
                                    5 Business Days before Holdings or any other
                                    Loan Party makes any payment with respect to
                                    the Senior Redeemable Notes, or any of the
                                    transactions related to, or contemplated by,
                                    the Indenture (and Holdings hereby
                                    represents and warrants that no such
                                    payments are due and payable by Holdings or
                                    the other Loan Parties during the
                                    Negotiation Period, other than the scheduled
                                    interest payment on the Senior Redeemable
                                    Notes).

                  Holdings hereby represents and warrants that the grace period
                  with respect to interest payments on the Senior Redeemable
                  Notes is a period of 30 days."

2. The Required Lenders hereby approve the form of note attached hereto as Annex
A and agree that any Indebtedness issued by Holdings to The Williams Companies,
Inc. as a result of the exercise of the purchase option by the Borrower in the
ADP transaction, which Indebtedness is evidenced by a note in the form of Annex
A (with such changes as shall have been approved by the Administrative Agent and
two or more of the other Agents), shall constitute "Qualifying Holdings Debt",
as such term is defined in the Credit Agreement.

                                       3
<PAGE>

3. This Amendment shall not become effective until the date on which the
following conditions precedent shall have been satisfied, or waived by the
Issuing Bank, the Agents and the Required Lenders in writing (such date being
referred to herein as the "Amendment Effective Date"):

         (a)      the Administrative Agent shall have received fully executed
                  counterparts of this Amendment 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;

         (b)      all fees and other charges presently due and payable to the
                  Administrative Agent or any Lender pursuant to any Loan
                  Document shall have been paid by the Borrower;

         (c)      all out-of-pocket expenses incurred by the Agents and invoiced
                  by March 27, 2002 in connection with the Credit Agreement,
                  this Amendment, the Side Letter, any other Loan Document or
                  the transactions contemplated by any of the foregoing
                  (including, without limitation, the reasonable fees and
                  disbursements of Clifford Chance Rogers & Wells LLP, Davis
                  Polk & Wardwell, Shearman & Sterling, Simpson Thacher &
                  Bartlett and PricewaterhouseCoopers LLP ("PWC")), shall have
                  been paid by the Borrower; and

         (d)      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.

4. 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 or (b) any
applicable order of any court or any rule, regulation or order of any other
agency of government; 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).

5. 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.

6. THE BORROWER HEREBY (A) CONFIRMS AND ACKNOWLEDGES TO THE ADMINISTRATIVE AGENT
AND THE LENDERS THAT IT IS VALIDLY AND JUSTLY INDEBTED TO THE ADMINISTRATIVE
AGENT AND THE LENDERS FOR THE PAYMENT OF ALL OBLIGATIONS (AS DEFINED IN THE
CREDIT AGREEMENT) WITHOUT OFFSET, DEFENSE, CAUSE OF ACTION OR COUNTERCLAIM OF
ANY KIND OR NATURE WHATSOEVER AND (B) REAFFIRMS AND ADMITS THE VALIDITY AND
ENFORCEABILITY OF THE CREDIT AGREEMENT AND THE LOAN DOCUMENTS AND

                                       4
<PAGE>

THE LIENS IN THE COLLATERAL WHICH WERE GRANTED PURSUANT TO ANY OF THE LOAN
DOCUMENTS OR OTHERWISE. EACH OF THE LOAN PARTIES, ON ITS OWN BEHALF AND ON
BEHALF OF ITS SUCCESSORS AND ASSIGNS, HEREBY WAIVES, RELEASES AND DISCHARGES
EACH AGENT AND EACH LENDER AND ALL OF THE AFFILIATES OF EACH AGENT AND EACH
LENDER, AND ALL OF THE DIRECTORS, OFFICERS, EMPLOYEES, ATTORNEYS, AGENTS,
SUCCESSORS AND ASSIGNS OF EACH AGENT, EACH LENDER AND SUCH AFFILIATES, FROM ANY
AND ALL CLAIMS, DEMANDS, ACTIONS OR CAUSES OF ACTION (KNOWN AND UNKNOWN) ARISING
OUT OF OR IN ANY WAY RELATING TO ANY OF THE LOAN DOCUMENTS AND ANY DOCUMENTS,
AGREEMENTS, DEALINGS OR OTHER MATTERS CONNECTED WITH ANY OF THE LOAN DOCUMENTS,
IN EACH CASE TO THE EXTENT ARISING (X) ON OR PRIOR TO THE DATE HEREOF OR (Y) OUT
OF, OR RELATING TO, ACTIONS, DEALINGS OR MATTERS OCCURRING ON OR PRIOR TO THE
DATE HEREOF.

7. HOLDINGS AND EACH SUBSIDIARY LOAN PARTY HEREBY (A) CONFIRMS AND AGREES THAT
ITS GUARANTEE PURSUANT TO THE CREDIT AGREEMENT OR SUBSIDIARY GUARANTEE (AS
APPLICABLE) IS, AND SHALL CONTINUE TO BE, IN FULL FORCE AND EFFECT AND IS HEREBY
CONFIRMED AND RATIFIED IN ALL RESPECTS; (B) CONFIRMS AND ACKNOWLEDGES THAT IT IS
VALIDLY AND JUSTLY INDEBTED TO THE ADMINISTRATIVE AGENT AND THE LENDERS FOR THE
PAYMENT OF ALL OF THE OBLIGATIONS WHICH IT HAS GUARANTEED, WITHOUT OFFSET,
DEFENSE, CAUSE OF ACTION OR COUNTERCLAIM OF ANY KIND OF NATURE WHATSOEVER; AND
(C) REAFFIRMS AND ADMITS THE VALIDITY AND ENFORCEABILITY OF THE CREDIT AGREEMENT
AND THE LOAN DOCUMENTS TO WHICH IT IS A PARTY AND THE LIENS IN THE COLLATERAL
WHICH WERE GRANTED BY IT PURSUANT TO ANY OF THE LOAN DOCUMENTS OR OTHERWISE.

8. 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, Simpson Thacher
& Bartlett, counsel to the Syndication Agent, Shearman and Sterling, counsel to
the Co-Documentation Agents, and PWC.

9. 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

                                       5
<PAGE>

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.

10. 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.

11. Any provision of this Amendment which is invalid, illegal or unenforceable
under the applicable law of any jurisdiction, shall, as to such jurisdiction, be
ineffective to the extent of such invalidity, illegality or unenforceability
without invalidating the remaining provisions hereof, and any such invalidity,
illegality or unenforceability in any jurisdiction shall not invalidate such
provision in any other jurisdiction.

12. No failure on the part of the Administrative Agent, the Issuing Bank or any
Lender to exercise, and no delay in exercising, any right, power or remedy under
this Amendment shall operate as a waiver thereof, nor shall any single or
partial exercise of any right, power or remedy hereunder preclude any other or
further exercise thereof or the exercise of any other right, power or remedy
whether provided in any Loan Document or otherwise. All remedies hereunder are
cumulative and are not exclusive of any other remedies under any other Loan
Document or provided by applicable law.

13. All references herein to any of the parties to this Amendment shall be
deemed to include the successors and assigns of such party; provided, however,
that none of the Loan Parties may assign any of its rights or obligations
hereunder or under the Side Letter without the prior written consent of the
Agents, the Issuing Bank and all of the Lenders, and all covenants, promises and
agreements by or on behalf of any of the Loan Parties which are contained herein
shall inure to the benefit of each of the Lenders and to the successors and
assigns of any of the Agents, the Issuing Bank and any of the Lenders.

14. 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.

15. 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.

16. 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]

                                       6
<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:  Howard S. Kalika
                                     Title: Senior Vice President

                               HOLDINGS:

                               WILLIAMS COMMUNICATIONS GROUP, INC.

                       [STAMP] By: /s/ HOWARD S. KALIKA
                                  ----------------------------------------------
                                     Name:  Howard S. Kalika
                                     Title: Senior Vice President

                               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 MANAGED
                                    SERVICES, LLC
                               WILLIAMS COMMUNICATIONS MANAGED SERVICES
                                    OF CALIFORNIA, INC.

                       [STAMP] By: /s/ HOWARD S. KALIKA
                                  ----------------------------------------------
                                     Name:  Howard S. Kalika
                                     Title: Senior Vice President

                                       7

[AMENDMENT NO. 4 TO SIDE LETTER]

<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
                                      Address:   Bank of America, N.A.
                                                 901 Main Street, 66th Floor
                                                 Dallas, TX  75202-3714
                                                 Attention: Jack Woodiel
                                                 Fax No.: (214) 209-3533

                               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: [ILLEGIBLE]

                               LEHMAN BROTHERS, INC.,
                               as Co-Documentation Agent

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

                               MERRILL LYNCH & CO.
                               as Co-Documentation Agent

                               By: /s/ CAROL J. E. FEELEY
                                   ---------------------------------------------
                                      Name:  Carol J. E. Feeley
                                      Title: Director

                                       8

[AMENDMENT NO. 4 TO SIDE LETTER]
<PAGE>

         BY SIGNING IN THE APPROPRIATE SPACE BELOW, THE UNDERSIGNED HEREBY
CONSENT TO THE FOREGOING AMENDMENT NO. 4 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/ CONSTANCE M. COLEMAN
                                  ----------------------------------------------
                                      Name:  Constance M. Coleman
                                      Title: Vice President

                               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/ CAROL J. E. FEELEY
                                  ----------------------------------------------
                                      Name:  Carol J. E. Feeley
                                      Title: Vice President

                                       9

[AMENDMENT NO. 4 TO SIDE LETTER]
<PAGE>

                               ABN AMRO BANK N.V.

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

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

                               BANK OF MONTREAL

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

                               THE BANK OF NEW YORK

                               By: /s/ JAMES W. WHITAKER
                                  ----------------------------------------------
                                      Name:  James W. Whitaker
                                      Title: Senior Vice President

                               BANK OF OKLAHOMA N.A.

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

                               BANK ONE, N.A.

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

                                       10

[AMENDMENT NO. 4 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/ JACQUELINE STEWART
                                  ----------------------------------------------
                                      Name:  Jacqueline Stewart
                                      Title: Executive Director

                               CREDIT LYONNAIS NEW YORK BRANCH

                               By: /s/ SANDRA E. HORWITZ
                                  ----------------------------------------------
                                      Name:  Sandra E. Horwitz
                                      Title: Senior Vice President

                               CREDIT SUISSE FIRST BOSTON

                               By: /s/ DAVID L. SAWYER
                                  ----------------------------------------------
                                      Name:  David L. Sawyer
                                      Title: Director

                               By: /s/ VANESSA GOMEZ
                                  ----------------------------------------------
                                      Name:  Vanessa Gomez
                                      Title: Associate

                                       11

[AMENDMENT NO. 4 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:
                                  ----------------------------------------------
                                      Name:
                                      Title:

                               FLEET NATIONAL BANK

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

                               THE FUJI BANK, LIMITED

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

                               IBM CREDIT CORPORATION

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

                                       12

[AMENDMENT NO. 4 TO SIDE LETTER]
<PAGE>

                               THE INDUSTRIAL BANK OF JAPAN, LIMITED,
                               NEW YORK BRANCH

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

                               KBC BANK, N.V.

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

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

                               MERRILL LYNCH GLOBAL ALLOCATION FUND, INC.

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

                               MERRILL LYNCH SERIES FUNDS, INC. Global
                               Allocation Strategy Portfolio

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

                               MERRILL LYNCH VARIABLE SERIES FUNDS, INC. Global
                               Allocation Focus Fund

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

                                       13

[AMENDMENT NO. 4 TO SIDE LETTER]
<PAGE>

                             R2 TOP HAT, LTD
                             By: Amalgamated Gadget, L.P., as Investment Manager
                             By: Scepter Holdings, Inc., its General Partner

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

                             SCOTIABANC INC.

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

                             STANDARD BANK LONDON LIMITED

                             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:

                                       14

[AMENDMENT NO. 4 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 Signatory

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

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

                             CONTRARIAN FUNDS, LLC
                             By:    Contrarian Capital Management, LLC
                                    as Manager

                                       15

[AMENDMENT NO. 4 TO SIDE LETTER]
<PAGE>

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

                             PACIFICA PARTNERS I, L.P.
                             By:    Imperial Credit Asset Management
                                    as Investment Manager

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

                             SANKATY HIGH YIELD ASSET PARTNERS

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

                             SANKATY HIGH YIELD PARTNERS II LP

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

                             AHAB PARTNERS, L.P.

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

                             CERBERUS PARTNERS, L.P.
                             By:    Cerberus Associates, L.L.C.
                                    its General Partner

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

                                       16

[AMENDMENT NO. 4 TO SIDE LETTER]

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