COMVERSE TECHNOLOGY INC/NY/
S-8 POS, 1997-05-19
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>
 
                                                       Registration No. 33-29292


                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                           __________________________

                        POST-EFFECTIVE AMENDMENT NO. 13

                                       TO

                                    FORM S-8

                             REGISTRATION STATEMENT

                                     UNDER

                           THE SECURITIES ACT OF 1933
                           __________________________


                           COMVERSE TECHNOLOGY, INC.
                           -------------------------
             (Exact name of registrant as specified in its charter)

      New York                                    13-3238402
      --------                                    ----------
(State or other jurisdiction of  (I.R.S. Employer Identification No.)
incorporation or organization)

                 170 Crossways Park Drive, Woodbury, NY   11797
                 ----------------------------------------------
               (Address of Principal Executive Offices)  (Zip Code)

                        1984 Incentive Stock Option Plan
                             1987 Stock Option Plan
                             ----------------------
                           (Full title of the plans)

                                 Kobi Alexander
               Chairman of the Board and Chief Executive Officer
                           Comverse Technology, Inc.
                            170 Crossways Park Drive
                            Woodbury, New York 11797
                            ------------------------
                    (Name and address of agent for service)

                                  516-677-7200
                                  ------------
         (Telephone number, including area code, of agent for service)

                                   Copies to:

                             William F. Sorin, Esq.
                                823 Park Avenue
                            New York, New York 10021

This Post-Effective Amendment to the Registration Statement shall hereafter
become effective in accordance with the provisions of Rule 464 of the General
Rules and Regulations under the Securities Act of 1933, as amended.
<PAGE>
 
PROSPECTUS
- ----------

                                144,827 SHARES

                           COMVERSE TECHNOLOGY, INC.

                                  COMMON STOCK
                               __________________

    This Prospectus relates to an aggregate of 144,827 shares of Common Stock,
par value $0.10 per share ("Common Stock"), of Comverse Technology, Inc.
("Comverse" or the "Company"), issuable upon the exercise of options which have
been granted pursuant to the Company's Stock Option Plans and which may be
offered for resale from time to time by the individuals hereinafter identified
(the "Registering Shareholders"), each in his discretion and for his own
account.  It is anticipated that the Registering Shareholders will offer such
shares at the prevailing prices in the over-the-counter market as at the date of
each such sale.  All expenses of registration incurred in connection with this
offering are being borne by the Company, but all selling and other expenses
incurred by the Registering Shareholders will be borne by them.  None of the
shares offered pursuant to this Prospectus have been registered prior to the
filing of the Registration Statement of which this Prospectus is a part.

    The Registering Shareholders, and any broker-dealers executing sale orders
on behalf of the Registering Shareholders, may be deemed to be "underwriters"
within the meaning of the Securities Act of 1933, as amended (the "Securities
Act"), and commissions received by such broker-dealers may be deemed to be
underwriting compensation under the Securities Act.

    The Common Stock is traded in the over-the-counter market and is regularly
quoted on the NASDAQ National Market System with the trading symbol CMVT.  On
May 14, 1997 the closing price of the Common Stock as reported by the NASDAQ
National Market System was $45.75 per share.

                             _____________________

         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION NOR HAS THE COMMISSION
            PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
           ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                             _____________________

                  The date of this Prospectus is May 19, 1997.
                             _____________________

    No person is authorized to give any information or to make any
representations, other than those contained in this Prospectus, in connection
with the offering described herein and, if given or made, such information or
representations must not be relied upon as having been authorized by the Company
or the Registering Shareholders.  Neither the delivery of this Prospectus nor
any sale made hereunder shall, under any circumstances, create an implication
that the information contained herein is correct as of any time subsequent to
the date hereof.  Statements made in this Prospectus, unless the context
indicates otherwise, are made as of the date hereof.

    This Prospectus does not constitute an offer to sell or a solicitation of an
offer to buy any securities offered hereby in any state to any person to whom
such offer or solicitation may not lawfully be made.
<PAGE>
 
                             AVAILABLE INFORMATION

    The Company is subject to the informational reporting requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act") and, in
accordance therewith, files reports, proxy or information statements and other
information with the Securities and Exchange Commission (the "Commission").
Such reports, proxy or information statements and other information filed by the
Company can be inspected and copied at public reference facilities of the
Commission located at 450 Fifth Street, N.W., Washington, D.C. 20549 and at the
Commission's regional offices located at 7 World Trade Center, 13th Floor, New
York, New York 10048 and at 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661.  Copies of such material may also be obtained from the Public
Reference Section of the Commission, 450 Fifth Street, N.W., Washington D.C.
20549, at prescribed rates.

    Information, as of particular dates, concerning the directors and officers
of the Company, their remuneration, options granted to them under the stock
option plans of the Company, the principal shareholders of the Company and any
material interest of such persons in transactions with the Company are and will
be disclosed in the proxy statements and annual reports of the Company filed
with the Commission.

                           _________________________

                      DOCUMENTS INCORPORATED BY REFERENCE

    The Company hereby incorporates by reference into this Prospectus the
following documents filed with the Commission:

      1. The Company's Annual Report on Form 10-K for the year ended December
         31, 1996, as amended;

      2. The Company's Quarterly Report on Form 10-Q for the quarter ended March
         31, 1997; and

      3. The description of the Company's Common Stock contained in its
         registration statement on Form 8-A filed with the Commission on March
         17, 1987.


    All documents filed by the Company after the date of this Prospectus
pursuant to Sections l3(a), l3(c), l4 and l5(d) of the Exchange Act, prior to
the filing of a post-effective amendment which indicates that all securities
offered hereby have been sold or which deregisters all securities then remaining
unsold, shall be deemed to be incorporated by reference in this Prospectus and
to be a part hereof from the date of filing of such documents.  Any statement
contained in a document incorporated or deemed to be incorporated by reference
herein shall be deemed to be modified or superseded for purposes of this
Prospectus to the extent that a statement contained herein or in any other
subsequently filed document which also is or is deemed to be incorporated by
reference herein modifies or supersedes such statement.  Any such statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus.

    The Company will provide without charge to each person to whom a copy of
this Prospectus has been delivered, upon written or oral request of such person,
a copy of any or all of the documents referred to above which have been or may
be incorporated by reference in this Prospectus (other than exhibits to such
documents).  The Company will also promptly furnish on written request, without
charge, a copy of its most recent Annual Report to Shareholders.  Requests for
copies of any such document should be directed to the Secretary of the Company,
by mail addressed to Comverse Technology, Inc., 170 Crossways Park Drive,
Woodbury, New York 11797, or by telephone at (516) 677-7200.

                                      -2-
<PAGE>
 
                                  THE COMPANY

      Comverse Technology, Inc., together with its subsidiaries, designs,
develops, manufactures, markets and supports special purpose computer and
telecommunications systems and software for multimedia communications and
information processing applications.  The Company's systems are used in a broad
range of applications by fixed and wireless telephone network operators,
government agencies, financial institutions and other public and commercial
organizations worldwide.  Through subsidiaries, the Company is also involved in
the provision of computer design and consulting services, the design and
development of software for Advanced Intelligent Network architecture and
services, the manufacture of special purpose systems for telephone answering
service bureaus, the operation of a telemessaging service bureau and capital
market activities for its own account.

      Comverse was incorporated in the State of New York in October 1984.  Its
principal executive offices are located at 170 Crossways Park Drive, Woodbury,
New York 11797, where its telephone number is (516) 677-7200.


                            REGISTERING SHAREHOLDERS

    The following table sets forth as to each of the Registering Shareholders
(i) his name and position with the Company, (ii) the number of shares of Common
Stock beneficially owned by him prior to this offering, (iii) the number of
shares which may be sold by him pursuant to this offering and (iv) the number of
shares, and the percentage of the total number of shares issued and outstanding
represented by such shares, beneficially owned by him assuming the sale of all
shares which may be sold pursuant to this Prospectus:
<TABLE>
<CAPTION>
 
                                                             Shares Beneficially
                             Number of Shares    Number of  Owned after Offering(1)
                            Beneficially Owned    Shares    ------------------------
Name and Position          Prior to Offering(1)   Offered      Number       Percent
- -------------------------  --------------------  ---------  -------------  ---------
<S>                        <C>                   <C>        <C>            <C>

Kobi Alexander
President, Chairman
 of the Board, Chief
 Executive Officer
 and Director                           863,750    100,000     763,750(2)         3.0

Carmel Vernia
Chief Operating Officer                 218,750     18,750     200,000(3)          *
                                                                           
Zvi Alexander
Director                                 31,000     12,000      19,000(4)          *
                                                                           
Igan Nissim
Chief Financial Officer                  17,500     10,000       7,500(5)          *
                                                                           
Sam Oolie
Director                                  8,077      4,077       4,000(6)          *
                                                                           
- ---------------------
</TABLE>
*    Less than one percent of total shares outstanding.

1) Except as otherwise noted, consists entirely of shares issuable upon the
   exercise of stock options. 
2) Includes 669,250 shares issuable upon the exercise of stock options. Does not
   include 350,000 shares issuable upon the exercise of stock options which
   become exercisable more than 60 days after the date hereof.
3) Does not include 31,250 shares issuable upon the exercise of stock options 
   which become exercisable more than 60 days after the date hereof. 
4) Includes 11,000 shares issuable upon the exercise of stock options. Does not
   include 6,000 shares issuable upon the exercise of stock options which 
   become exercisable more than 60 days after the date hereof. 
5) Does not include 17,500 shares issuable upon the exercise of stock options 
   which become exercisable more than 60 days after the date hereof.
6) Does not include 6,000 shares issuable upon the exercise of stock options 
   which become exercisable more than 60 days after the date hereof.

                                      -3-
<PAGE>
 
                              PLAN OF DISTRIBUTION

     Each of the Registering Shareholders has advised the Company that he
intends to sell the shares offered hereby from time to time in the over-the-
counter market at prices prevailing in such market at the time of sale.  Each
Registering Shareholder may also sell all or any portion of such shares from
time to time in private transactions.  Any such transactions may be effectuated
directly or through broker-dealers, who may act as agent or as principal.  The
Registering Shareholders, and any broker-dealers participating in such
transactions, may be deemed to be underwriters within the meaning of the
Securities Act.

     Broker-dealers participating in such transactions as agent may receive
commissions from the Registering Shareholders or from the other parties to the
transactions.  Usual and customary brokerage fees will be paid by the
Registering Shareholders.  Broker-dealers who acquire shares as principal may
thereafter resell such shares in the over-the-counter market, in negotiated
transactions or otherwise at market prices prevailing at the time of sale.  Any
commissions paid or any discounts or concessions allowed to such broker-dealers,
and, if any such broker-dealers purchase shares as principal, any profits
received by them on the resale of such shares, may be deemed to be underwriting
compensation within the meaning of the Securities Act.

     The Company will receive no part of the proceeds of any sales of shares
made hereunder, except insofar as the amount due to the Company upon the
exercise of any stock option in payment of the purchase price of the underlying
shares may be deemed to be paid to the Company out of the proceeds of the sale
of such shares hereunder.


                                 LEGAL MATTERS

     Legal matters in connection with the Common Stock offered hereby are being
passed upon for the Company by William F. Sorin, attorney-at-law, 823 Park
Avenue, New York, New York 10021.  Mr. Sorin is an officer and director of the
Company and the beneficial owner of 25,000 shares of Common Stock issuable upon
exercise of stock options.

                                      -4-
<PAGE>
 
                                    PART II

          INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.        Information Incorporated by Reference.
               --------------------------------------

          There are hereby incorporated by reference in this Registration
Statement the following documents and information heretofore filed with the
Securities and Exchange Commission:

          (a) The Company's Annual Report on Form 10-K for the year ended
     December 31, 1996, filed pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934, as amended (the "Exchange Act");

          (b) The Company's Quarterly Report on Form 10-Q for the quarter ended
     March 31, 1997;

          (c) All other reports and other documents filed by the Company
     pursuant to Section l3(a) or l5(d) of the Exchange Act since December 31,
     1996; and

          (c) The description of the Company's Common Stock contained in its
     Registration Statement on Form 8-A dated March 16, 1987, filed pursuant to
     Section 12(b) or (g) of the Exchange Act.

          All documents filed by the Company pursuant to Sections l3(a), l3(c),
l4 and l5(d) of the Exchange Act after the date of this Registration Statement
and prior to the filing of a post-effective amendment which indicates that all
securities offered hereby have been sold or which deregisters all securities
then remaining unsold, shall be deemed to be incorporated by reference in this
Registration Statement and to be a part hereof from the date of filing of such
documents.

Item 4.        Description of Securities.
               --------------------------

               Not applicable.

Item 5.        Interests of Named Experts and Counsel.
               ---------------------------------------

          Counsel for the Company, William F. Sorin, 823 Park Avenue, New York,
New York 10021, has rendered an opinion to the effect that the Common Stock
offered hereby will, when issued in accordance with the Company's 1987 Stock
Option Plan, be legally and validly issued, fully-paid and nonassessable.  Mr.
Sorin is an officer and director of the Company and the beneficial owner of
25,000 shares of Common Stock issuable upon exercise of stock options.

Item 6.        Indemnification of Directors and Officers.
               ------------------------------------------

          The Company has included in its Certificate of Incorporation, pursuant
to Section 402(b) of the Business Corporation Law of the State of New York, a
provision that no director of the Company shall be personally liable to the
Company or its shareholders in damages for any breach of duty as a director,
provided that such provision shall not be  construed to eliminate or limit the
liability of any director if a judgment or other final adjudication adverse to
him establishes that his acts or omissions were in bad faith or involved
intentional misconduct or a knowing violation of law, that he personally gained
in fact a financial profit or other advantage to which he was not legally
entitled or that his acts violated Section 719 of the Business Corporation Law.
<PAGE>
 
          The By-Laws of the Company further provide that the Company shall
indemnify its directors and officers, and shall advance their expenses in the
defense of any action for which indemnification is sought, to the full extent
permitted by the Business Corporation Law and when authorized by resolution of
the shareholders or directors of the Company or any agreement providing for such
indemnification or advancement of expenses, provided that no indemnification may
be made to or on behalf of any director or officer if a judgment or other final
adjudication adverse to him establishes that his acts were committed in bad
faith or were the result of active and deliberate dishonesty material to the
cause of action so adjudicated, or that he personally gained in fact a financial
profit or other advantage to which he was not legally entitled.  The Company has
entered into indemnity agreements with each of its directors and officers
pursuant to the foregoing provisions of its By-Laws.

Item 7.        Exemption from Registration Claimed.
               ------------------------------------

               Not applicable.

Item 8.        Exhibits.
               ---------

          Exhibit
Item      Number         Description
- ----      ------         -----------

 4.                      Instruments defining the rights of security
                         holders, including indentures:

          4(A)           Excerpts from certificate of incorporation, as
                         amended.(1)

          4(B)           Excerpts from by-laws, as amended. (2)

          4(C)           Specimen stock certificate. (2)

          4(D)           Indenture dated as of November 30, 1993 from Comverse
                         Technology, Inc. to The Chase Manhattan Bank, N.A.,
                         Trustee. (3) 

          4(E)           Specimen 5-1/4% Convertible Subordinated Debenture
                         due 2003. (3)

          4              Indenture dated as of October 4, 1996 from Comverse
                         Technology, Inc. to The Chase Manhattan Bank, N.A.,
                         Trustee. (4)

          4(F)           Specimen 5-3/4% Convertible Subordinated Debenture due
                         2006. (5)

         10(K)           1984 Incentive Stock Option Plan. (6)

         10(ddd)         1987 Stock Option Plan. (7)

         10(19)          1994 Stock Option Plan. (8)

         10(20)          1995 Stock Option Plan. (9)

         10(21)          1996 Stock Option Plan(10)

   5.     5              Opinion of William F. Sorin, Esq. (11)

  15.                    Not Applicable.

  23.    23.1            Consent of legal counsel included in Exhibit No. 5.

         23.2            Consent of Deloitte & Touche LLP. (11)

                                      II-2
<PAGE>
 
  24.    24              Powers of attorney included in signature page.

  27.                    Not Applicable.

  28.                    Not Applicable.

  99.                    Not Applicable.

__________________

1    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1994.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

2    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1992.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

3    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1993.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

4    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1996.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

5    Included in Exhibit 4.

6    Incorporated by reference to Exhibits filed with Registration Statement on
     Form S-1 under the Securities Act of 1933, Registration No. 33-9147.
     Exhibit number shown is the Exhibit number of the document as filed with
     such Registration Statement.

7    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1992.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

8    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1994.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

9    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1995.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

10   Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1996.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

11   Filed with this Post-Effective Amendment.

                                      II-3
<PAGE>
 
Item 9.        Undertakings.
               -------------

     (a)  (1)  The Company undertakes to file, during any period in which offers
or sales are being made hereunder, a post-effective amendment to this
registration statement:  (i) to include any prospectus required by Section
10(a)(3) of the Act; (ii) to reflect in the prospectus any facts or events
arising after the effective date of the registration statement (or the most
recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in the
registration statement; (iii) to include any material information with respect
to the plan of distribution not previously disclosed in the registration
statement or any material change to such information in the registration
statement; provided, however, that clauses (1)(i) and (1)(ii) do not apply if
the information required to be included in a posteffective amendment by those
clauses is contained in periodic reports filed by the Company pursuant to
section 13 or section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the registration statement.

          (2) The Company hereby undertakes that, for the purpose of determining
any liability under the Act, each such post-effective amendment shall be deemed
to be a new registration statement relating to the securities offered therein,
and the offering of such securities at that time shall be deemed to be the
initial bona fide offering thereof.

          (3) The Company hereby undertakes to remove from registration by means
of a post-effective amendment any of the securities being registered which
remain unsold at the termination of the offering.

     (b) The Company hereby undertakes that, for purposes of determining any
liability under the Act, each filing of the Company's annual report pursuant to
Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
Company pursuant to the foregoing provisions, or otherwise, the Company has been
advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable.  In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses
incurred or paid by a director, officer or controlling person of the Company in
the successful defense of any such action, suit or proceeding) is asserted by
such director, officer or controlling person in connection with the securities
being registered, the Company will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.

                                      II-4
<PAGE>
 
                                   SIGNATURES

     Pursuant to the requirements of Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Amendment No. 13 to
the Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of New York, State of New York on May 19,
1997.

                                    COMVERSE TECHNOLOGY, INC.


                                    By:  /s/ KOBI ALEXANDER
                                         ----------------------
                                         Kobi Alexander, President,
                                         Chairman of the Board
                                         and Chief Executive Officer

     Pursuant to the requirements of the Securities Act of 1933 this Amendment
No. 13 to the Registration Statement has been signed by the following persons in
the capacities and on the dates indicated.


/s/ Kobi Alexander    President, Chairman of the Board,         May 19, 1997
- --------------------  Chief Executive Officer and Director  
Kobi Alexander        (principal executive officer)       
                    


/s/ Igal Nissim       Vice President-Finance and-               May 19, 1997
- --------------------  Chief Financial Officer   
Igal Nissim           (principal financial and
                      accounting officer)      
                    


/s/ Sam Oolie         *  Director                               May 19, 1997
- --------------------  
Sam Oolie


/s/ William F. Sorin  *  Director                               May 19, 1997
- --------------------    
William F. Sorin


/s/ Yechiam Yemini    *  Director                               May 19, 1997
- --------------------    
Yechiam Yemini


*  By:  /s/ Kobi Alexander
        -------------------
        Kobi Alexander
        Attorney-in-Fact

                                      II-5
<PAGE>
 
                               INDEX OF EXHIBITS

          Exhibit
Item      Number         Description
- ----      ------         -----------


 4.                      Instruments defining the rights of security
                         holders, including indentures:

          4(A)           Excerpts from certificate of incorporation, as
                         amended.(1)

          4(B)           Excerpts from by-laws, as amended. (2)

          4(C)           Specimen stock certificate. (2)

          4(D)           Indenture dated as of November 30, 1993 from Comverse
                         Technology, Inc. to The Chase Manhattan Bank, N.A.,
                         Trustee. (3)
                         
          4(E)           Specimen 5-1/4% Convertible Subordinated Debenture
                         due 2003. (3)

          4              Indenture dated as of October 4, 1996 from Comverse
                         Technology, Inc. to The Chase Manhattan Bank, N.A.,
                         Trustee. (4)
                         
          4(F)           Specimen 5-3/4% Convertible Subordinated Debenture due
                         2006. (5)
                
         10(K)           1984 Incentive Stock Option Plan. (6)
                
         10(ddd)         1987 Stock Option Plan. (7)
                
         10(19)          1994 Stock Option Plan. (8)
                
         10(20)          1995 Stock Option Plan. (9)
                
         10(21)          1996 Stock Option Plan(10)

 5.       5              Opinion of William F. Sorin, Esq. (11)

15.                      Not Applicable.

23.    23.1              Consent of legal counsel included in Exhibit No. 5.

       23.2              Consent of Deloitte & Touche LLP. (11)

24.    24                Powers of attorney included in signature page.

27.                      Not Applicable.

28.                      Not Applicable.

99.                      Not Applicable.

__________________

1    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1994.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

2    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1992.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.
<PAGE>
 
3    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1993.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

4    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1996.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

5    Included in Exhibit 4.

6    Incorporated by reference to Exhibits filed with Registration Statement on
     Form S-1 under the Securities Act of 1933, Registration No. 33-9147.
     Exhibit number shown is the Exhibit number of the document as filed with
     such Registration Statement.

7    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1992.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

8    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1994.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

9    Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1995.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

10   Incorporated by reference to Exhibits filed with Annual Report on Form 10-K
     under the Securities Exchange Act of 1934 for the year ended December 31,
     1996.  Exhibit number shown is the Exhibit number of the document as filed
     with such Annual Report.

11   Filed with this Post-Effective Amendment.

                                      II-2

<PAGE>
 
                                                            EXHIBIT 5

May 19, 1997

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D. C. 20549-1004

RE:  COMVERSE TECHNOLOGY, INC.
     -------------------------

Gentlemen:

I have acted as legal counsel to Comverse Technology, Inc., a New York
corporation (the "Company"), in connection with the registration, pursuant to a
Registration Statement on Form S-8 (the "Registration Statement") under the
Securities Act of 1933, as amended, of an aggregate of 21,446,880 shares of
Common Stock of the Company, par value $0.01 per share ("Common Stock"),
issuable upon the exercise of options ("Options") which have been or may be
granted under the Company's 1984 Incentive Stock Option Plan and 1987 Stock
Option Plan (the "Plans"), including the registration for resale, pursuant to a
prospectus prepared in accordance with Part I of Form S-3, of an aggregate of
144,827 shares of Common Stock, as set forth in Post-Effective Amendment No. 13
to the Registration Statement.

I have examined originals, or copies certified to my satisfaction, of the
Certificate of Incorporation and By-Laws of the Company, the minutes and other
records of the proceedings of the Board of Directors and of the Stockholders of
the Company, the Plans and such other documents, corporate and public records,
agreements, and certificates of officers of the Company and of public and other
officials, and I have considered such questions of law, as I have deemed
necessary as a basis for the opinions hereinafter expressed.  In such
examination I have assumed the genuineness of all signatures and the
authenticity of all documents submitted to me as originals and the conformity to
original documents of all documents submitted to me as certified or photostatic
copies.

Based on and subject to the foregoing, I hereby advise you that, in my opinion,
the issuance of shares of Common Stock, upon exercise of the Options in
accordance with the provisions and subject to the conditions set forth in the
Plans and in the agreements executed thereunder governing the issuance and
exercise of the Options, has been duly authorized and, when the consideration
for such shares has been received by the Company and such shares have been
issued in accordance with and subject to such terms and conditions, such shares
of Common Stock will be legally issued, fully paid and nonassessable.

I hereby consent to the reference to the undersigned under the caption "Legal
Matters" in the Prospectus included in the Registration Statement.

Very truly yours,


William F. Sorin

<PAGE>
 
                                                            EXHIBIT 23.2



INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Post Effective Amendment
No. 13 to Registration Statement No. 33-29292 of Comverse Technology, Inc. on
Form S-8 of our report dated February 5, 1997, appearing in the Annual Report on
Form 10-K of Comverse Technology, Inc. for the year ended December 31, 1996.

Deloitte & Touche LLP

New York, New York
May 19, 1997


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