EXHIBIT 2.3

                      AMENDMENT NO. 4 TO CREDIT AGREEMENT
                      -----------------------------------


          AMENDMENT NO. 4, dated as of October 27, 1998, to the Credit
Agreement, dated as of November 21, 1997 (as amended from time to time, the
"Credit Agreement"), among (a) USTELECENTERS, INC., a Delaware corporation (the
 ----------------                                                              
"Borrower"), (b) VIEW TECH, INC., a Delaware corporation (the "Parent Company"),
 --------                                                      --------------   
(c) IMPERIAL BANK and BANKBOSTON, N.A. (the "Banks"), and (d) IMPERIAL BANK, in
                                             -----                             
its capacity as Agent for the Banks and as Issuer with respect to Letters of
Credit.

                                    RECITALS
                                    --------

          As required by Section 9.1.9 of the Credit Agreement, Vermont Network
                         -------------                                         
Services Corporation, a Delaware corporation and a wholly-owned Subsidiary of
the Parent Company, has agreed to become a party to the Credit Agreement as a
"Principal Company" and as a "Guarantor" thereunder; and, in connection
therewith, the Principal Companies, the Banks and the Agent have agreed to amend
certain of the provisions contained in the Credit Agreement, all as set forth in
this Amendment No. 4 ("this Agreement").
                       --------------   

          Accordingly, the parties hereto hereby agree as follows:

                                   ARTICLE I

                                  DEFINITIONS
                                  -----------

     SECTION 1.1.  DEFINITIONS IN CREDIT AGREEMENT.  Unless otherwise defined
                   -------------------------------                           
herein, terms defined in the Credit Agreement (as amended hereby) are used
herein as therein defined.  The term "AMENDMENT DOCUMENTS," as used in this
                                      -------------------                  
Agreement, shall mean this Agreement and the VNSC Security Agreement.

                                  ARTICLE II

                                  AMENDMENTS
                                  ----------

     Effective on and as of October 27, 1998 ("Effective Date"), and subject
                                               --------------               
always in any event to the provisions of Article IV hereof, the Credit Agreement
                                         ----------                             
is hereby amended in each of the following respects:

 
                                      -2-


     SECTION 2.1.  NEW DEFINED TERMS.  Section 1.1 of the Credit Agreement is
                   -----------------   -----------                           
hereby amended by adding thereto each of the following new defined terms:

               "Amendment No. 4" means Amendment No. 4 to Credit Agreement, 
                --------------- 
          dated as of October 27, 1998, among VNSC, the Borrower, the Parent
          Company, the Banks and the Agent, upon the terms of which VNSC has
          agreed to become a party hereto as a Principal Company and as a
          Guarantor hereunder, and upon the terms of which each of the parties
          hereto has agreed to amend this Agreement.

               "Amendment No. 4 Effective Date" means October 27, 1998, the so-
                ------------------------------   
          called "Effective Date" of Amendment No. 4 to Credit Agreement.

               "VNSC" means Vermont Network Services Corporation, a Delaware 
                ----
          corporation and a wholly-owned Subsidiary of the Parent Company.

               "VNSC Security Agreement" means the Security Agreement, dated as 
                -----------------------
          of October 27, 1998, between VNSC and the Agent, executed and
          delivered by VNSC in favor of the Agent, for the benefit of the
          Secured Parties.

     SECTION 2.2.  WAIVERS BY GUARANTORS, ETC.  Article VI of the Credit
                   --------------------------   ----------              
Agreement is hereby amended by adding the following new Section 6.6 immediately
                                                        -----------            
after Section 6.5 thereof:
      -----------         

               SECTION 6.6.  WAIVERS BY GUARANTORS, ETC.  The Obligations of
                             --------------------------                     
          each of the Guarantors under this Agreement and the other Loan
          Documents shall not be to any extent or in any way or manner
          whatsoever satisfied, discharged, diminished, impaired or otherwise
          affected by any of the following, and each of the Guarantors hereby
          absolutely and irrevocably waives any defenses that it may otherwise
          have as a result of the occurrence of any of the following, whether or
          not any of the Guarantors shall have had any notice or knowledge of
          any thereof:

                    (a)  the existence or creation at any time or times on or
          after the date of this Agreement of any claim, defense, right of set-
          off or counterclaim of any nature whatsoever of any Guarantor against
          any of the Secured Parties;


                    (b)  any incapacity or lack of authority of any Guarantor;

 
                                      -3-

                    (c)  any of the Obligations or any of the Loan Documents or
          any provision of any thereof or any of the Liens securing any
          Obligations shall at any time or for any reason whatsoever cease to be
          in full force or effect with respect to any one or more of the
          Guarantors or shall be declared null and void or illegal, invalid,
          unenforceable or inadmissible in evidence in relation to any one or
          more of the Guarantors, or any of the Obligations of any one or more
          of the Guarantors or any Liens securing any Obligations of any one or
          more of the Guarantors shall be subject to avoidance, or shall be
          avoided, as a fraudulent transfer or fraudulent conveyance, whether
          prior to or after the commencement of any Bankruptcy or Insolvency
          Proceedings; or

                    (d)  the existence of any other condition or circumstance or
          the occurrence of any other event or condition that might otherwise
          constitute a legal or equitable discharge of or a suretyship defense
          to performance by any Guarantor of any of its Obligations to any of
          the Secured Parties.

          Each Guarantor hereby absolutely, unconditionally and irrevocably
          waives all suretyship and other similar defenses to performance by
          such Guarantor of any of its Obligations, and each Guarantor  further
          assents to and waives notice of any and all matters hereinbefore
          specified in clauses (a) through (d) of this Section 6.6.
                       -----------          -          ----------- 

     SECTION 2.3.  YEAR 2000 COMPLIANCE.  Section 9.1 of the Credit Agreement is
                   --------------------   -----------                           
hereby amended by adding the following new Section 9.1.10 immediately after
                                           --------------                  
Section 9.1.9 thereof:
- -------------         

               SECTION 9.1.10.  YEAR 2000 COMPLIANCE.  Perform all acts
                                --------------------                   
          necessary to ensure that each of the Principal Companies becomes Year
          2000 Compliant in a timely manner.  Such acts will include, as and to
          the extent determined by the Principal Companies on a reasonable basis
          to be reasonably necessary and appropriate considering the nature of
          the business and operations conducted by the Principal Companies and
          their Subsidiaries, performing a comprehensive review and assessment
          of all systems of the Principal Companies and their Subsidiaries and,
          if and as reasonably necessary or appropriate, adopting a plan, with
          itemized budget, if appropriate, for the remediation, monitoring and
          testing of such systems.  As used in this Section 9.1.10, the term
                                                    --------------          
          "YEAR 2000 COMPLIANT" means, with respect to any Person, that all
          --------------------                                              
          software, hardware, firmware, equipment, goods or systems utilized by
          or material to the business, operations or financial condition of such
          Person will properly perform date sensitive functions before, during
          and after the year 2000.  The Principal Companies will, 

 
                                      -4-

          promptly upon request by the Agent or any of the Banks, provide to the
          Agent and the Banks such evidence of compliance by the Principal
          Companies and each of their Subsidiaries with the terms of this
          Section 9.1.10 as the Agent or any of the Banks may from time to time
          --------------       
          reasonably require.


                                  ARTICLE III

                              ACCESSION AGREEMENT
                              -------------------
                                        

     SECTION 3.1.  OBLIGATIONS OF VNSC UNDER THE CREDIT AGREEMENT.  VNSC hereby
                   ----------------------------------------------              
agrees to become a party to the Credit Agreement on and as of the Effective Date
as a Principal Company and as a Guarantor thereunder and to be bound at all
times from and after the Effective Date, as a Principal Company and as a
Guarantor, by all of the terms and provisions of the Credit Agreement applicable
to Principal Companies and Guarantors thereunder.  VNSC further agrees that,
from and after the Effective Date, each reference in the Credit Agreement to a
"Principal Company" or to a "Guarantor" shall also mean and be a reference to
- ------------------           ---------                                       
VNSC, and each reference in any of the other Loan Documents to a "Principal
                                                                  ---------
Company" or to a "Guarantor" shall also mean and be a reference to VNSC.
- -------           ---------                                             

     SECTION 3.2.  OBLIGATIONS OF VNSC UNDER THE INTERCOMPANY SUBORDINATION
                   --------------------------------------------------------
AGREEMENT.  VNSC hereby agrees to become a party to the Intercompany
- ---------                                                           
Subordination Agreement on and as of the Effective Date as an Affiliated Company
thereunder and to be bound at all times from and after the Effective Date, as an
Affiliated Company, by all of the terms and provisions of the Intercompany
Subordination Agreement applicable to Affiliated Companies thereunder.  VNSC
further agrees that, from and after the Effective Date, each reference in the
Intercompany Subordination Agreement to an "Affiliated Company" shall also mean
                                            ------------------                 
and be a reference to VNSC.

     SECTION 3.3.  RATIFICATION OF OBLIGATIONS BY PRINCIPAL COMPANIES, ETC.
                   ------------------------------------------------------- 

     (a)  All of the Obligations of the Borrower to the Secured Parties under
the Credit Agreement, the Notes and the other Loan Documents are, by the
execution and delivery by the Borrower of this Agreement, ratified and confirmed
by the Borrower in all respects.

     (b)  All of the Obligations of each Guarantor to the Secured Parties under
the Guaranties and the Credit Agreement and under the other Loan Documents to
which it is a party are, by the execution and delivery by such Guarantor of this
Agreement, ratified and confirmed by such Guarantor in all respects.

 
                                      -5-

     SECTION 3.4.  WAIVER.  Each of the Banks and the Agent hereby waives all
                   ------                                                    
such Defaults and Events of Default that may have occurred or resulted as a
consequence of the failure by the Principal Companies to perform by October 15,
1998 all of their Obligations (a) with respect to VNSC under Section 9.1.9 of
                                                             -------------   
the Credit Agreement and Section 4.6 of Amendment No. 3, and (b) with respect to
                         -----------                                            
the 1998 Warrant Amendments under Section 4.7 of Amendment No 3.  It is the
                                  -----------                              
understanding of the parties hereto that the Obligations of the Principal
Companies (i) under Section 9.1.9 of the Credit Agreement and Section 4.6 of
                    -------------                             -----------   
Amendment No. 3 with respect to VNSC, and (ii) under Section 4.7 of Amendment
                                                     -----------             
No. 3 with respect to the 1998 Warrant Amendments, shall be satisfied when the
conditions precedent set forth in Article IV hereof are satisfied by the
                                  ----------                            
Principal Companies.

                                   ARTICLE IV


                              CONDITIONS PRECEDENT
                              --------------------

     This Agreement, including each of the amendments to the Credit Agreement
set forth in Article II of this Agreement and the waivers of the Banks and the
             ----------                                                       
Agent set forth in Section 3.4, shall be effective and in full force and effect
                   -----------                                                 
on and as of and from and after the Effective Date; provided, however, that each
                                                    --------  -------           
of the following conditions precedent shall first be satisfied:

     SECTION 4.1.  AMENDMENT DOCUMENTS, ETC.  The Agent and the Banks shall have
                   ------------------------                                     
received counterparts of this Agreement duly and properly authorized and
executed by each of VNSC, the Borrower and the Parent Company.  The Agent and
the Banks shall have received counterparts of the VNSC Security Agreement duly
and properly authorized and executed by VNSC.  Each of the 1998 Warrant
Amendments shall have been duly and properly authorized, executed and delivered
by the Parent Company.

     SECTION 4.2.  REPRESENTATIONS AND WARRANTIES.  Each of the representations
                   ------------------------------                              
and warranties made by the Principal Companies in this Agreement shall be true
and correct in all material respects on and as of the Effective Date with the
same full force and effect as if made and repeated on and as of such date.

     SECTION 4.3.  FEES, COSTS AND EXPENSES.  The Borrower and the Parent
                   ------------------------                              
Company shall have paid in full to special counsel for the Agent all of the
reasonable out-of-pocket costs and expenses of special counsel to the Agent
incurred during the period from August 14, 1998 through the Effective Date and
for which an invoice shall have been submitted to the Borrower and the Parent
Company.

 
                                      -6-

     SECTION 4.4.  UCC FILINGS, ETC.   All action reasonably required by the
                   ----------------                                         
Agent to create in favor of the Agent and for the benefit of the Secured Parties
perfected first-priority Liens in the Collateral described in the VNSC Security
Agreement shall have been duly and properly taken by or on behalf of VNSC in
order to create such perfected first-priority Liens.  The Agent shall have
received from the Parent Company in pledge, upon the terms contained in the
Pledge Agreement, a stock certificate evidencing all of the issued and
outstanding shares of Capital Stock of VNSC, together with an undated stock
power duly executed in blank.

     SECTION 4.5.  CERTIFICATES, ETC.  The Agent shall have received:
                   -----------------                                 

          (a)  from VNSC, a certificate, dated as of the Effective Date, of its
Secretary or Assistant Secretary as to:

               (i)  resolutions of its Board of Directors then in full force and
     effect authorizing the execution, delivery and performance by VNSC of this
     Agreement and the VNSC Security Agreement; and

               (ii) the incumbency and signatures of the officers of VNSC
     authorized to act with respect to this Agreement and the VNSC Security
     Agreement (upon which certificate the Secured Parties may conclusively rely
     until the Agent shall have received a further certificate of VNSC canceling
     or amending such prior certificate, which further certificate shall be
     reasonably satisfactory to the Agent);

          (b)  a certificate signed by the Secretary of State of the State of
organization or incorporation of VNSC, dated a date reasonably near (but prior
to) the Effective Date, stating that VNSC is a corporation duly organized,
validly existing and in good standing under the laws of such State; and

          (c)  such other documents as the Agent or any of the Banks may
reasonably request with respect to any matter relevant to VNSC, this Agreement,
the other Loan Documents or any of the transactions contemplated hereby or
thereby.

Each of such documents shall be in form and substance reasonably satisfactory to
the Agent and the Banks.

     SECTION 4.6.  NO MATERIALLY ADVERSE EFFECT.  Except as shall have been
                   ----------------------------                            
described by the Principal Companies to the Agent and the Banks in writing prior
to the date hereof, no events or developments shall have occurred since June 30,
1998 which, individually or in the aggregate, have had or could reasonably be
expected to have a Materially Adverse Effect.

     SECTION 4.7.  SATISFACTORY LEGAL FORM, ETC.  All Instruments executed and
                   ----------------------------                               
delivered or otherwise submitted pursuant hereto by or on behalf 

 
                                      -7-

of VNSC or any of the other Principal Companies shall be reasonably satisfactory
in form and substance to each of the Banks, the Agent and its special counsel;
each of the Banks, the Agent and its special counsel shall have received all
such information, and such counterpart originals or such certified or other
copies of such materials, as any of the Banks, the Agent or its special counsel
may reasonably request; and all legal matters incident to the transactions
contemplated by this Agreement or the VNSC Security Agreement shall be
reasonably satisfactory to each of the Banks, the Agent and its special counsel.


                                   ARTICLE V

                   REPRESENTATIONS, WARRANTIES AND COVENANTS
                   -----------------------------------------

     Each of the Principal Companies represents and warrants to and covenants
with the Agent and the Banks as follows:

     SECTION 5.1.  REPRESENTATIONS IN LOAN DOCUMENTS.  Each of the
                   ---------------------------------              
representations and warranties made by or on behalf of each of the Principal
Companies to the Agent and the Banks in the Loan Documents was true and correct
in all material respects when made and is true and correct in all material
respects on and as of the date hereof, EXCEPT (a) as affected by the
                                       ------                       
consummation of the transactions contemplated by the Loan Documents (including
this Agreement), and (b) to the extent that any such representation or warranty
relates by its express terms solely to a prior date.

     SECTION 5.2.  CORPORATE AUTHORITY, ETC.  The execution and delivery by each
                   -------------------------                                    
Principal Company of each Amendment Document to which it is a party, and the
performance by each Principal Company of its agreements and obligations under
each such Amendment Document, have been duly and properly authorized by all
necessary corporate or other action on the part of each of the Principal
Companies, and do not and will not conflict with, result in any violation of, or
constitute any default under, (a) any provision of any Governing Document of any
Principal Company, (b) any Contractual Obligation of any Principal Company, or
(c) any Applicable Law.

     SECTION 5.3.  VALIDITY, ETC.  This Agreement has been duly executed and
                   -------------                                            
delivered by each Principal Company and constitutes the legal, valid and binding
obligation of each Principal Company, enforceable against it in accordance with
its terms, and the VNSC Security Agreement has been duly executed and delivered
by VNSC and constitutes the legal, valid and binding obligation of VNSC,
enforceable against it in accordance with its terms, except (in each case) as
such enforceability may be limited by bankruptcy, reorganization, insolvency,
moratorium or other similar laws at the time in effect affecting the
enforceability of the rights of creditors generally and to 

 
                                      -8-

general equitable principles. Each of the Principal Companies hereby ratifies
and confirms in all respects all of the Obligations as modified hereby.

     SECTION 5.4.  NO DEFAULTS.  After giving effect to this Agreement, no
                   -----------                                            
Defaults or Events of Default are continuing under the Credit Agreement or any
of the other Loan Documents.

     SECTION 5.5.  YEAR 2000 PROBLEM. Each of the Principal Companies has
                   -----------------                                     
reviewed the areas within its operations and business which could be adversely
affected by, and has developed or is developing a program to address on a timely
basis, the Year 2000 Problem and has made related inquiry of material suppliers
and vendors.  Based on such review and program, the Principal Companies
represent and warrant that the Year 2000 Problem will not have a Materially
Adverse Effect.  As used herein, the term "Year 2000 Problem" means the
                                           -----------------           
possibility that any computer applications or equipment used by the Principal
Companies or any of their Subsidiaries may be unable to recognize and properly
perform date-sensitive functions

     SECTION 5.6.  EXISTING LIENS AND EXISTING INDEBTEDNESS FOR BORROWED MONEY.
                   -----------------------------------------------------------  
None of the Property of VNSC is or will be subject to any Liens, except such
Liens as are permitted by Section 9.2.3.  VNSC is not and will not become liable
                          -------------                                         
or responsible for any Indebtedness for Borrowed Money, except such Indebtedness
for Borrowed Money as is permitted by Section 9.2.2.
                                      ------------- 

     SECTION 5.7.  LITIGATION, ETC.  There is no pending or, to the best
                   ---------------                                      
knowledge of VNSC or of any of the other Principal Companies (after due
inquiry), threatened litigation, arbitration or governmental investigation or
proceeding against VNSC or to which any of the Property of VNSC is subject.

     SECTION 5.8.  COMPLIANCE WITH APPLICABLE LAWS.  VNSC is in substantial
                   -------------------------------                         
compliance in all material respects with all applicable laws, except to the
extent that any failure so to be in compliance has not had and could not
reasonably be expected to have a Materially Adverse Effect.


                                   ARTICLE VI

                       PROVISIONS OF GENERAL APPLICATION
                       ---------------------------------

     SECTION 6.1.  NO OTHER CHANGES.  Except as otherwise expressly provided by
                   ----------------                                            
the Amendment Documents, all of the terms, conditions and provisions of the
Credit Agreement and each of the other Loan Documents, and all rights and
remedies of the Agent and the Banks thereunder, shall remain unaltered.

              [REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

 
                                      -9-

     SECTION 6.2.  OTHER PROVISIONS.  This Agreement and the VNSC Security
                   ----------------                                       
Agreement are Loan Documents for all purposes of the Credit Agreement and each
of the other Loan Documents. This Agreement may be executed in any number of
counterparts and by different parties hereto in separate counterparts, but all
of such counterparts shall together constitute but one and the same agreement.
In making proof of this Agreement, it shall not be necessary to produce or
account for more than one counterpart hereof signed by each of the parties
hereto.

              [REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

 
                                      -10-



          IN WITNESS WHEREOF, the parties hereto have caused this AMENDMENT NO.
4 TO CREDIT AGREEMENT to be executed and delivered by their respective
authorized officers as of the date first above written.


THE BORROWER:                          VNSC:
- ------------                           ---- 

USTELECENTERS, INC.                    VERMONT NETWORK
                                       SERVICES CORPORATION

By:  /s/ Franklin A. Reece, III        By:  /s/ Franklin A. Reece, III
   ------------------------------         ------------------------------
    Name:  Franklin A. Reece, III          Name:  Franklin A. Reece, III
    Title: President                       Title: President

THE PARENT COMPANY:
- ------------------ 

VIEW TECH, INC.

By:  /s/ Ali Inanilan
   ------------------------------
    Name:  Ali Inanilan
    Title: Chief Financial and
           Administrative Officer


THE BANKS AND THE AGENT:
- ----------------------- 

IMPERIAL BANK, INDIVIDUALLY AS A BANK AND AS THE AGENT


By:  /s/ Paula J. Barysauskas
   ------------------------------
    Name:  Paula J. Barysauskas
    Title: Vice President


BANKBOSTON, N.A., INDIVIDUALLY AS A BANK


By:  /s/ Frank Gianino
   ------------------------------
    Name:  Frank Gianino
    Title: Vice President