Document:

<PAGE>

                                                                   Exhibit 10.27

        AMENDMENT NO. 5 TO AMENDED AND RESTATED CREDIT AGREEMENT AMONG
    IPC INFORMATION SYSTEMS, INC., AS PARENT BORROWER, IPC FUNDING CORP.,
       AS SUB BORROWER, IPC COMMUNICATIONS, INC., AS A LOAN PARTY, THE
       LENDERS SIGNATORY THERETO, AS LENDERS, GENERAL ELECTRIC CAPITAL
        CORPORATION, AS ISSUING BANK, COLLATERAL AGENT, ADMINISTRATIVE
         AGENT AND LENDER, AND FIRST UNION CAPITAL MARKETS, INC., AS
                              DOCUMENTATION AGENT

          This Amendment No. 5 to Amended and Restated Credit Agreement, dated
as of December 15, 1999 (this "Amendment"), is entered into by and among IPC
Information Systems, Inc., a Delaware corporation (the "Parent Borrower"); IPC
Funding Corp., a Delaware corporation (the "Sub Borrower"); IPC Communications,
Inc., a Delaware corporation ("Holdings"), as a Loan Party; General Electric
Capital Corporation, as a Lender, and as Collateral Agent, Issuing Bank and
Administrative Agent (the "Administrative Agent") for the Lender Parties; and
the other Lenders.

                                   RECITALS

     A.   Borrowers, Holdings, the Administrative Agent, the Lenders and First
Union Capital Markets, Inc., as Documentation Agent, are parties to that certain
Amended and Restated Credit Agreement, dated as of June 21, 1999 (as amended by
Amendment No. 1 thereto, dated as of July 1, 1999, Amendment No. 2 thereto,
dated as of August 12, 1999, Amendment No.3 thereto, dated as of September 24,
1999, and Amendment No. 4, dated as of December 1, 1999 (the "Fourth
Amendment"), as so amended, the "Credit Agreement").

     B.   Borrowers, Holdings, the Administrative Agent and the Lenders are
desirous of amending certain sections of, and making certain other changes to,
the Credit Agreement, all as and to the extent set forth in this Amendment and
subject to the terms and conditions set forth herein.

          NOW THEREFORE, in consideration of the premises and the mutual
covenants hereinafter contained, and of the loans or other extensions of credit
heretofore, now or hereafter made to, or for the benefit of, Borrowers by
Lenders, Borrowers, Holdings, the Administrative Agent and Lenders hereby agree
as follows:

1.   Definitions.  Except to the extent otherwise specified herein, capitalized
     -----------
terms used in this Amendment shall have the same meanings ascribed to them in
the Credit Agreement.

2.   Amendments.
     ----------

     2.1. Section 2.3 of the Fourth Amendment is hereby amended by deleting the
date "October 31, 1999" and replacing it with the date "November 30, 1999".

     2.2. Section 2.4 of the Fourth Amendment is hereby amended by deleting the
date "October 31, 1999" each time it appears in such Section and replacing it in
each instance with the date "November 30, 1999".
<PAGE>

     2.3. Section 2.5 of the Fourth Amendment is hereby amended by deleting the
date "October 31, 1999" each time it appears in such Section and replacing it in
each instance with the date "November 30, 1999".

     2.4. Section 2.6 of the Fourth Amendment is hereby amended by deleting the
date "October 31, 1999" each time it appears in such Section and replacing it in
each instance with the date "November 30, 1999".

     2.5  Section 2.7 of the Fourth Amendment is hereby amended by deleting it
in its entirety and replacing it with the following:

          "The Parent Borrower shall furnish to the Lender Parties and the
          Agents no later than December 31, 1999, monthly financial statements
          as at and for the twelve month period ended October 31, 1999,
          including balance sheets and statements of income, which shall be
          prepared in a manner consistent with the quarterly financial
          statements required under Section 5.03 of the Credit Agreement, shall
          be certified by the chief financial officer of Holdings and the Parent
          Borrower in a manner consistent with the certification of the
          quarterly financial statements required under Section 5.03, and shall
          otherwise be in form and substance acceptable to the Administrative
          Agent and Lenders."

     2.6  The Parent Borrower shall furnish to the Lender Parties and the Agents
no later than January 15, 1999, monthly financial statements as at and for the
twelve month period ended November 30, 1999, including balance sheets,
statements of income and statements of cash flows, which shall be prepared in a
manner consistent with the quarterly financial statements required under Section
5.03 of the Credit Agreement, shall be certified by the chief financial officer
of Holdings and the Parent Borrower in a manner consistent with the
certification of the quarterly financial statements required under Section 5.03,
shall demonstrate compliance with each of the financial covenants set forth in
Sections 2.3 through 2.6, inclusive, of the Fourth Amendment, as amended by
Sections 2.1 through 2.4, inclusive, of this Amendment, and shall otherwise be
in form and substance acceptable to the Administrative Agent and Lenders.

     2.7  The failure to perform or observe any of the covenants or agreements
contained in Sections 2.3 through 2.6, inclusive, of the Fourth Amendment, as
amended by Sections 2.1 through 2.4, inclusive, of this Amendment, shall
constitute an immediate "Event of Default" under the Credit Agreement, as and to
the same extent as if such failure to perform or observe any of such covenants
or agreements was an "Event of Default" under Section 6.01 (c) of the Credit
Agreement.

3.   Acknowledgment and Consent of Guarantors.  Each Guarantor hereby consents
     ----------------------------------------
to this Amendment and hereby confirms and agrees that (a) notwithstanding the
effectiveness of this Amendment or any of the other prior amendments comprising
part of the Credit Agreement, the Guaranty and each other Loan Document to which
it is a party is, and shall continue to be, in full force and effect and is
hereby ratified and confirmed in all respects, and (b) the Collateral Documents
to which such Guarantor is a party and all of the Collateral described therein
do, and shall continue to, secure the payment of all of the Secured Obligations
(in each case, as defined therein).

                                       2
<PAGE>

4.   Conditions Precedent to Amendment.  This Amendment shall be effective upon
     ---------------------------------
satisfaction of each of the following conditions precedent:

     4.1. This Amendment shall have been duly executed and delivered by each of
the Borrowers, Holdings, the Guarantors, the Administrative Agent and Required
Lenders.

     4.2. All of the representations and warranties contained in the Credit
Agreement and any other documents executed in connection therewith are true and
correct on and as of the date hereof as though made on the date hereof.

5.   Reference to and Effect Upon the Credit Agreement and other Loan
     ----------------------------------------------------------------
Agreements.

     5.1. Except as specifically amended in Section 2, the Credit Agreement, the
Notes and each other Loan Document shall remain in full force and effect and
each is hereby ratified and confirmed.

     5.2. The execution, delivery and effect of this Amendment shall be limited
precisely as written and shall not be deemed to (i) be a consent to any waiver
of any term or condition, or to any amendment or modification of any term or
condition (except as specifically amended in Section 2), of the Credit Agreement
or any other Loan Document or (ii) prejudice any right, power or remedy which
any Agent or any Lender now has or may have in the future under or in connection
with the Credit Agreement, the Notes or any other Loan Document. Each reference
in the Credit Agreement to "this Agreement", "hereunder", "hereof", "herein" or
any other word or words of similar import shall mean and be a reference to the
Credit Agreement as amended hereby, and each reference in any other Loan
Document to the Credit Agreement or any word or words of similar import shall be
and mean a reference to the Credit Agreement as amended hereby.

6.   Counterparts.  This Amendment may be executed in any number of
     ------------
counterparts, each of which when so executed shall be deemed an original but all
such counterparts shall constitute one and the same instrument. Delivery of an
executed counterpart by facsimile shall be as effective as delivery of a
manually signed original counterpart.

7.   Costs and Expenses.  As provided in Section 8.04 of the Credit Agreement,
     ------------------
Borrowers shall pay the fees, costs and expenses incurred by the Administrative
Agent in connection with the preparation, execution and delivery of this
Amendment (including, without limitation, attorneys' fees).

8.   GOVERNING LAW.  THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN
     -------------
ACCORDANCE WITH THE INTERNAL LAWS (AS OPPOSED TO CONFLICTS OF LAW PROVISIONS) OF
THE STATE OF NEW YORK.

9.   Headings.  Section headings in this Amendment are included herein for
     --------
convenience of reference only and shall not constitute a part of this Amendment
for any other purpose.

                           [Signature Pages Follow]

                                       3
<PAGE>

          IN WITNESS WHEREOF, this Amendment No. 5 to Amended and Restated
Credit Agreement has been duly executed as of the date first written above.

                                   IPC INFORMATION SYSTEMS, INC.,
                                   as Parent Borrower

                                   By: __________________________

                                   Title:________________________

                                   IPC FUNDING CORP.,
                                   as Sub Borrower

                                   By: __________________________

                                   Title:________________________

                                   IPC COMMUNICATIONS, INC.,
                                   as a Loan Party

                                   By: __________________________

                                   Title:________________________

                                   GENERAL ELECTRIC CAPITAL CORPORATION,
                                   as Administrative Agent, Collateral Agent,
                                   Issuing Bank and Lender

                                   By: __________________________

                                   Title:________________________

                                   FIRST UNION NATIONAL BANK,
                                   as Lender

                                   By: __________________________

                                   Title:________________________

                                   GMAC COMMERCIAL CREDIT LLC,
                                   as a Lender

                                   By: __________________________

                                   Title:________________________
<PAGE>

                           INTERNATIONAL EXCHANGE NETWORKS, LTD., as a Guarantor

                           By: __________________________

                           Title:________________________

                           INTERNATIONAL EXCHANGE NETWORK CORP., as a Guarantor

                           By: __________________________

                           Title:________________________

                           HNG CORP., as a Guarantor

                           By: __________________________

                           Title:________________________

                           V BAND CORPORATION, as a Guarantor

                           By: __________________________

                           Title:________________________

                           IXNET, INC., as a Guarantor

                           By: __________________________

                           Title:________________________
<PAGE>

                              IPC INFORMATION SYSTEMS FAR EAST INC., as
                              a Guarantor

                              By: __________________________

                              Title:________________________

                              MXNET INC., as a Guarantor

                              By: __________________________

                              Title:________________________

                              IPC INFORMATION SYSTEMS ASIA PACIFIC,
                              LIMITED, as a Guarantor

                              By: __________________________

                              Title:________________________

                              IPC INFORMATION SYSTEMS CANADA, INC., as
                              a Guarantor

                              By: __________________________

                              Title:________________________

                              IXNET UK LIMITED, as a Guarantor

                              By: __________________________

                              Title:________________________

                              IPC INFORMATION SYSTEMS, as a Guarantor

                              By: __________________________

                              Title:________________________

                              IPC UK HOLDINGS, LTD., as a Guarantor

                              By: __________________________

                              Title:________________________

<PAGE>

                              IPC UK SPC LIMITED, as a Guarantor

                              By: __________________________

                              Title:________________________

                              SATURN GLOBAL NETWORK SERVICES HOLDINGS LIMITED,
                              as a Guarantor

                              By: __________________________

                              Title:________________________

                              IXNET AUSTRALIA PTY LIMITED, as a Guarantor

                              By: __________________________

                              Title:________________________

                              IXNET HONG KONG LIMITED (f/k/a Saturn Global
                              Network Services (Hong Kong) Limited), as a
                              Guarantor

                              By: __________________________

                              Title:________________________

                              SATURN GLOBAL NETWORK SERVICES (JAPAN) LTD., as a
                              Guarantor

                              By: __________________________

                              Title:________________________

                              SATURN GLOBAL NETWORK SERVICES (SINGAPORE)
                              PTE LTD., as a Guarantor

                              By: __________________________

                              Title:________________________<PAGE>

                                                                   EXHIBIT 10.28

                          CONSENT AND AMENDMENT NO. 6
                         -----------------------------

          CONSENT AND AMENDMENT NO. 6, dated as of January 21, 2000 (this
"Consent and Amendment"), to Amended and Restated Credit Agreement, dated as of
June 21, 1999 (as amended by Amendment No. 1 thereto, dated as of July 1, 1999,
Amendment No. 2 thereto, dated as of August 12, 1999, Amendment No. 3 thereto,
dated as of  September 24, 1999, Amendment No. 4 thereto, dated as of December
1, 1999 and Amendment No. 5 thereto, dated as of December 15, 1999, the "Credit
Agreement"), by and among IPC Information Systems, Inc., as Parent Borrower, IPC
Funding Corp., as Sub Borrower, IPC Communications, Inc., as a Loan Party, the
Lenders signatory thereto, as Lenders, General Electric Capital Corporation, as
Issuing Bank, Collateral Agent and Administrative Agent, and First Union Capital
Markets, Inc., as Documentation Agent.

                            PRELIMINARY STATEMENTS
                            ----------------------

          A.  International Exchange Networks, Ltd., a Delaware corporation
("IXnet") and an indirect Subsidiary of the Parent Borrower, desires to acquire
all of the outstanding shares of capital stock (the "Acquisition") of System
Programming and Network Computing, Inc., a Delaware corporation ("SPNC"), from
Sean Gilman ("Gilman") for an aggregate purchase price consisting of (1)
$300,000 in cash, (2) a promissory note to Gilman in the original principal
amount of $100,000 (the "Gilman Note") and (3) 6,080 shares of common stock of
IXnet, Inc., a Delaware corporation ("IXnet Holdings") and the direct parent of
IXnet, pursuant to the Stock Purchase Agreement by and among SPNC, IXnet and
Gilman, dated as of January 21, 2000 (the "Stock Purchase Agreement").

          B.  Section 5.02(f)(vii) of the Credit Agreement permits the Parent
Borrower and its Subsidiaries to make certain Investments, subject to the
satisfaction of certain conditions specified therein.

          C.  Section 5.02(g) of the Credit Agreement prohibits the Parent
Borrower and its Subsidiaries from issuing any shares of capital stock, subject
to certain exceptions specified therein.

          D.  Section 5.02(b)(iii)(B) of the Credit Agreement permits the Parent
Borrower and its Subsidiaries to incur Debt in connection with certain permitted
Investments, subject to the satisfaction of certain conditions specified
therein.

          E.  The Borrowers have requested that the Lenders amend Section
5.02(g) of the Credit Agreement as set forth herein.

          F.  The Lenders are willing to consent to the Acquisition and certain
related matters and to amend the Credit Agreement on the terms and conditions
set forth herein.

          NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements contained herein, the parties hereto hereby agree as
follows:
<PAGE>

1.  Definitions.   The terms defined in the Credit Agreement and not otherwise
    -----------
defined herein shall have the meanings ascribed to them in the Credit Agreement.

2.  Consent.  Subject to the satisfaction of the conditions set forth in Section
    -------
4 hereof:

    2.1.  Notwithstanding the conditions set forth in clauses (2) and (4) of
Section 5.02(f)(vii) of the Credit Agreement, but subject to the satisfaction of
all other conditions set forth in Section 5.02(f)(vii) and to the compliance
with all other terms and conditions set forth in this Consent and Amendment and
the Credit Agreement (including without limitation, Section 5.01(o) of the
Credit Agreement), the Lenders hereby consent to the Acquisition.

    2.2.  Notwithstanding the provisions of Section 5.02(g) of the Credit
Agreement, but subject to the compliance with all other terms and conditions set
forth in this Consent and Amendment and the Credit Agreement, the Lenders
consent to (a) the issuance of 6,080 shares of common stock of IXnet Holdings as
part of the consideration for the Acquisition under the Stock Purchase Agreement
and (b) the issuance of 22,080 restricted shares of common stock of IXnet
Holdings to Gilman pursuant to the Restricted Stock Agreement, dated as of
January __, 2000, between IXnet and Gilman.

    2.3.  Notwithstanding the provision of Section 5.02(b)(iii)(B) of the Credit
Agreement that any Debt issued or incurred to finance an acquisition under
Section 5.02(f)(vii) be Subordinated Debt, but subject to the compliance with
all other provisions set forth in Section 5.02(b)(iii)(B) and all other terms
and conditions set forth in this Consent and Amendment and the Credit Agreement,
the Lenders consent to the issuance of the Gilman Note as part of the
consideration for the Acquisition under the Stock Purchase Agreement.

    2.4.  Each of the foregoing consents is only applicable and shall only be
effective in the specific instance and for the specific purpose for which made.
Each consent is expressly limited to the facts and circumstances referred to
herein and shall not operate (i) as a waiver of or consent to non-compliance
with any other Section or provision of the Credit Agreement or any other Loan
Document, (ii) as a waiver of any other right, power or remedy of either the
Administrative Agent or any Lender Party under the Credit Agreement or any other
Loan Document or (iii) as a waiver of or consent to any Default or Event of
Default under the Credit Agreement or any other Loan Document.

3.  Amendment. Section 5.02(g) of the Credit Agreement is amended by deleting
    ---------
from clause (iii)(D) the words "twelve and six tenths percent (12.6%)" and
replacing them with the words "fourteen percent (14%)".

4.  Conditions to Consent and Amendment.  The effectiveness of the consents
    -----------------------------------
contained in Section 2 and the amendment contained in Section 3 shall be subject
to the fulfillment of the condition precedent that the Borrowers, Holdings, the
Administrative Agent and the Required Lenders shall have executed and delivered
this Consent and Amendment to the Administrative Agent.

5.  Reference to and Effect Upon the Credit Agreement and other Loan Documents.
    --------------------------------------------------------------------------
Except as specifically amended hereby, the Credit Agreement, the Notes and each
other Loan Document shall remain in full force and effect and each is hereby
ratified and confirmed.  Each reference in
<PAGE>

the Credit Agreement to "this Agreement", "hereunder", "hereof", "herein" or any
other word or words of similar import shall mean and be a reference to the
Credit Agreement as amended hereby, and each reference in any other Loan
Document to the Credit Agreement or any word or words of similar import shall be
and mean a reference to the Credit Agreement as amended hereby.

6.  Miscellaneous.
    -------------

    6.1.  Governing Law.  This Consent and Amendment shall be governed and
          -------------
construed in accordance with the laws of the State of New York.

    6.2.  Counterparts.  This Consent and Amendment may be signed in any number
          ------------
of counterparts with the same effect as if the signatures thereto and hereto
were upon the same instrument. Delivery of an executed signature page to this
Consent and Amendment by facsimile shall be as effective as delivery of an
original executed signature page.

    6.3.  Binding Effect; Assignment. This Consent and Amendment shall be
          --------------------------
binding upon and inure to the benefit of the Borrowers and its respective
successors and to the benefit of the Administrative Agent and the Lenders and
their respective successors and assigns.

    6.4.  Fees and Expenses.  The Borrowers shall pay the Administrative Agent
          -----------------
for all reasonable expenses, including reasonable fees of legal counsel,
incurred by the Administrative Agent in connection with the preparation,
negotiation and execution of this Consent and Amendment and any related matters.

                           [SIGNATURE PAGES FOLLOW]
<PAGE>

          IN WITNESS WHEREOF, this Consent and Amendment has been duly executed
as of the date first written above.

                                    IPC INFORMATION SYSTEMS, INC.,
                                    as Parent Borrower

                                    By: __________________________
                                    Title:________________________

                                    IPC FUNDING CORP.,
                                    as Sub Borrower

                                    By:___________________________
                                    Title:________________________

                                    IPC COMMUNICATIONS, INC.,
                                    as a Loan Party

                                    By:___________________________
                                    Title:________________________

                                    GENERAL ELECTRIC CAPITAL CORPORATION,
                                    as Administrative Agent, Collateral Agent,
                                    Issuing Bank and Lender

                                    By:___________________________
                                    Title:________________________

                                    FIRST UNION NATIONAL BANK,
                                    as a Lender

                                    By: __________________________
                                    Title: _______________________

                                    GMAC COMMERCIAL CREDIT LLC,
                                    as a Lender

                                    By: __________________________
                                    Title: _______________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   INTERNATIONAL EXCHANGE NETWORKS,
                                   LTD., as a Guarantor

                                   By: ___________________________

                                   Title:_________________________
<PAGE>

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   INTERNATIONAL EXCHANGE NETWORK
                                   CORP., as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   HNG CORP., as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   V BAND CORPORATION, as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IXNET, INC., as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IPC INFORMATION SYSTEMS FAR EAST INC.,
                                   as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   MXNET INC., as a Guarantor

                                   By: __________________________

                                   Title:________________________
<PAGE>

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IPC INFORMATION SYSTEMS ASIA PACIFIC,
                                   LIMITED, as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IPC INFORMATION SYSTEMS CANADA, INC., as a
                                   Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IXNET UK LIMITED, as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IPC INFORMATION SYSTEMS, as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IPC UK HOLDINGS, LTD., as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IPC UK SPC LIMITED, as a Guarantor

                                   By: __________________________

                                   Title:________________________
<PAGE>

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   SATURN GLOBAL NETWORK SERVICES HOLDINGS
                                   LIMITED, as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IXNET AUSTRALIA PTY LIMITED, as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IXNET HONG KONG LIMITED (f/k/a Saturn Global
                                   Network Services (Hong Kong) Limited), as a
                                   Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   SATURN GLOBAL NETWORK SERVICES (JAPAN) LTD.,
                                   as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   SATURN GLOBAL NETWORK SERVICES (SINGAPORE)
                                   PTE LTD., as a Guarantor

                                   By: __________________________

                                   Title:________________________

          The undersigned hereby acknowledges and consents to this Consent and
Amendment No. 6 and hereby ratifies and confirms the Guaranty and each other
Loan Document to which it is a party.

                                   IPC FUNDING CORP, as a Guarantor

                                   By: __________________________

                                   Title:________________________

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