EXHIBIT D


                                 FORM OF CT
                     TAX OPINION REPRESENTATION LETTER

                                   , 1997


Hale and Dorr LLP
60 State Street
Boston, MA 02109

Cravath, Swaine & Moore
Worldwide Plaza
825 Eighth Avenue
New York, NY 10019-7475

Ladies and Gentlemen:

          On behalf of Comverse Technology, Inc. ("CT") and in connection
with the opinions to be delivered by your firms pursuant to Sections
6.02(c) and 6.03(c) of the Agreement and Plan of Merger (the "Merger
Agreement") dated as of August 20, 1997, between CT and Boston Technology,
Inc. ("BT"),[1] the undersigned hereby certifies that, to the extent the
facts relate to CT to his knowledge and after due diligence, and to the
extent otherwise without knowledge to the contrary, the following facts are
now true and will continue to be true as of the Effective Time:

          1. The consideration received by each BT stockholder pursuant to
     the Merger Agreement is the result of arm's-length negotiations
     between the parties to the Merger Agreement.

          2. CT has no plan or intention to reacquire any of the CT stock
     issued in the Merger.

          3. CT has no plan or intention to sell or otherwise dispose of
     any of the assets of BT acquired by CT in the Merger, except for
     dispositions made in the ordinary course of business; provided,
     however, that notwithstanding the foregoing CT may transfer assets of
     BT acquired by CT in the Merger in a manner that is consistent with
     Section 368(a)(2)(C) of the Code.

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     [1] For purposes of this certificate, capitalized terms used and not
otherwise defined herein shall have the meaning ascribed thereto in the
Merger Agreement.



          4. There is no intercorporate indebtedness existing between CT
     and BT that was issued, acquired, or will be settled at a discount.

          5. Neither CT nor any subsidiary of CT owns, or has owned during
     the past five years, any shares of BT; provided that for purposes of
     this representation shares held by any pension fund that is under
     independent management are not treated as being owned by CT or any of
     its subsidiaries.

          6. Following the Merger, CT will continue the historic business
     of BT or use a significant portion of the historic business assets of
     BT in a business.

          7. CT is not an investment company as defined in section
     368(a)(2)(F)(iii) and (iv) of the Internal Revenue Code.

          8. The payment of cash in lieu of fractional shares of CT stock
     is solely for the purpose of avoiding the expense and inconvenience to
     CT of issuing fractional shares and does not represent separately
     bargained for consideration. The total cash consideration that will be
     paid in the Merger to BT stockholders instead of issuing fractional
     shares of CT stock will not exceed one percent of the total
     consideration that will be issued in the Merger to BT stockholders in
     exchange for their shares of BT stock. The fractional share interests
     of each BT stockholder will be aggregated, and no BT stockholder will
     receive cash in an amount equal to or greater than the value of one
     full share of CT stock.

          9. Subject to Section 5.09 of the Merger Agreement, CT, BT and
     the shareholders of BT will pay its expenses, if any, incurred in
     connection with the Merger.

          10. None of the compensation received by any
     stockholder-employees of BT will be separate consideration for, or
     allocable to, any of their shares of BT stock; none of the shares of
     CT stock received by any stockholder-employees will be separate
     consideration for, or allocable to, any employment agreement; and the
     compensation paid to any stockholder-employees will be for services
     actually rendered and will be commensurate with amounts paid to third
     parties bargaining at arm's length for similar services.



          11. The facts relating to the Merger of BT with and into CT
     pursuant to the Merger Agreement, as described in the Merger
     Agreement, the documents described in Section 5.01 of the Merger
     Agreement and the joint proxy statement/prospectus prepared by CT and
     BT, are, insofar as such facts pertain to CT, true, correct and
     complete in all material respects.

          12. CT will not take any position on any Federal, state or local
     income or franchise tax return, or take any other tax reporting
     position, that is inconsistent with the treatment of the Merger as a
     reorganization within the meaning of Sections 368(a) of the Code,
     unless otherwise required by a "determination" (as defined in Section
     1313(a)(1) of the Code) or by applicable state or local income or
     franchise tax law.

          13. The Merger Agreement and the documents described in Sections
     5.01 and 8.06 of the Merger Agreement represent the entire
     understanding of BT and CT with respect to the Merger.

          14. CT is not, and at the Effective Time will not be, under the
     jurisdiction of a court in a Title 11 or similar case within the
     meaning of Section 368(a)(3)(A).

          15. Except with respect to payments of cash to BT shareholders
     perfecting dissenters' rights or in lieu of fractional shares of CT
     stock, one hundred percent (100%) of the BT stock outstanding
     immediately prior to the Merger will be exchanged solely for CT stock.
     Thus, except as set forth in the preceding sentence, CT intends that
     no consideration be paid or received (directly or indirectly, actually
     or constructively) for BT stock other than CT stock.

          16. The total fair market value of all consideration other than
     CT stock received by BT shareholders in the Merger (including, without
     limitation, cash paid to BT shareholders perfecting dissenters' rights
     or in lieu of fractional shares of CT stock) will be less than fifty
     percent (50%) of the aggregate fair market value of the BT stock
     outstanding immediately prior to the Merger.

          I have read the drafts of your opinion letters attached to this
letter and understand that Cravath, Swaine & Moore, as counsel for CT, and
Hale and Dorr, as counsel for BT, will rely on this certificate in
rendering their



respective opinions concerning certain of the Federal income tax
consequences of the Merger and hereby commit to inform them if, for any
reason, any of the foregoing representations ceases to be true prior to the
Effective Time. I understand that your opinions will not address any tax
consequences of the Merger or any action taken in connection therewith
except as expressly set forth in such opinions.


                                        COMVERSE TECHNOLOGY, INC.,

                                          by
                                             ---------------------
                                             Name:
                                             Title: