INTEGRAL CAPITAL MANAGEMENT II LP
SC 13D/A, 1998-05-13
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1 )*

                          CORSAIR COMMUNICATIONS, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   220406 10 2
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                                Pamela K. Hagenah
                            Integral Capital Partners
                               2750 Sand Hill Road
                          Menlo Park, California 94025
                                 (650) 233-0360
- --------------------------------------------------------------------------------
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)


                                  May 11, 1998
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the following box
[ ].

         NOTE: Six copies of this statement,  including all exhibits,  should be
filed with the  Commission.  See Rule  13d-1(a) for other parties to whom copies
are to be sent.

         *The  remainder  of this cover page shall be filled out for a reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

         The information  required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).
         
                         (Continued on following pages)

                        Page 1 of 29 Pages Exhibit Index

                              Contained on Page 11
<PAGE>
- --------------------------------------------------------------------------------
CUSIP NO.  220406 10 2                  13D                   Page 2 of 29 Pages
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Integral Capital Management II, L.P. ("ICM2")
- --------------------------------------------------------------------------------
2    CHECK APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                     (a) [ ]             (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    SOURCE OF FUNDS*                                                      WC
- --------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDING IS REQUIRED  PURSUANT TO ITEMS
     2(d) OR 2(e)                                                          [ ]
- --------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION
          Delaware (limited partnership)
- --------------------------------------------------------------------------------
                    7    SOLE VOTING POWER                       -0-
                    ------------------------------------------------------------
       NUMBER       8    SHARED VOTING POWER
         OF                   557,154  shares,   of  which  410,302  shares  are
       SHARES                 directly  owned by Integral  Capital  Partners II,
    BENEFICIALLY              L.P.  ("ICP2")  and  146,852  shares are  directly
   OWNED BY EACH              owned by Integral Capital  Partners  International
     REPORTING                II C.V. ("ICPI2").  ICM2 is the general partner of
       PERSON                 ICP2 and the investment general partner of ICPI2.
        WITH        ------------------------------------------------------------
                    9    SOLE DISPOSITIVE POWER                  -0-
                    ------------------------------------------------------------
                    10   SHARED DISPOSITIVE POWER
                              557,154 shares (see response to Item 8)
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                 557,154 shares
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                            [ ]
- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                        4.08%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*                                               PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>
- --------------------------------------------------------------------------------
CUSIP NO.  220406 10 2                  13D                   Page 3 of 29 Pages
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Integral Capital Management III, L.P. ("ICM3")
- --------------------------------------------------------------------------------
2    CHECK APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                     (a) [ ]             (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    SOURCE OF FUNDS*                                                      WC
- --------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDING IS REQUIRED  PURSUANT TO ITEMS
     2(d) OR 2(e)                                                          [ ]
- --------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION
          Delaware (limited partnership)
- --------------------------------------------------------------------------------
                    7    SOLE VOTING POWER                       -0-
                    ------------------------------------------------------------
       NUMBER       8    SHARED VOTING POWER
         OF                   137,007  shares,   of  which  111,647  shares  are
       SHARES                 directly  owned by Integral  Capital Partners III,
    BENEFICIALLY              L.P.  ("ICP3")  and  25,360  shares  are  directly
   OWNED BY EACH              owned by Integral Capital  Partners  International
     REPORTING                III L.P. ("ICPI3"). ICM3 is the general partner of
       PERSON                 ICP3 and the investment general partner of ICPI3.
        WITH        ------------------------------------------------------------
                    9    SOLE DISPOSITIVE POWER                  -0-
                    ------------------------------------------------------------
                    10   SHARED DISPOSITIVE POWER
                              137,007 shares (see response to Item 8)
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                 137,007 shares
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                            [ ]
- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                        1.00%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*                                               PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>
- --------------------------------------------------------------------------------
CUSIP NO.  220406 10 2                  13D                   Page 4 of 29 Pages
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Integral Capital Partners II, L.P. ("ICP2")
- --------------------------------------------------------------------------------
2    CHECK APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                     (a) [ ]             (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    SOURCE OF FUNDS*                                                      WC
- --------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDING IS REQUIRED  PURSUANT TO ITEMS
     2(d) OR 2(e)                                                          [ ]
- --------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION
          Delaware (limited partnership)
- --------------------------------------------------------------------------------
                    7    SOLE VOTING POWER                       -0-
                    ------------------------------------------------------------
       NUMBER       8    SHARED VOTING POWER
         OF                   410,302  shares are  directly  owned by ICP2. 
       SHARES                 Integral  Capital  Management II, L.P. is the 
    BENEFICIALLY              general partner of ICP2.                      
   OWNED BY EACH              
     REPORTING                
       PERSON                 
        WITH        ------------------------------------------------------------
                    9    SOLE DISPOSITIVE POWER                  -0-
                    ------------------------------------------------------------
                    10   SHARED DISPOSITIVE POWER
                              410,302 shares (see response to Item 8)
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                 410,302 shares
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                            [ ]
- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                        3.01%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*                                               PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




<PAGE>
- --------------------------------------------------------------------------------
CUSIP NO.  220406 10 2                  13D                   Page 5 of 29 Pages
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Integral Capital Partners International II, C.V. ("ICPI2")
- --------------------------------------------------------------------------------
2    CHECK APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                     (a) [ ]             (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    SOURCE OF FUNDS*                                                      WC
- --------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDING IS REQUIRED  PURSUANT TO ITEMS
     2(d) OR 2(e)                                                          [ ]
- --------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION
          Netherlands Antilles (limited partnership)
- --------------------------------------------------------------------------------
                    7    SOLE VOTING POWER                       -0-
                    ------------------------------------------------------------
       NUMBER       8    SHARED VOTING POWER
         OF                   146,852  shares are directly  owned by ICPI2.
       SHARES                 Integral  Capital  Management II, L.P. is the
    BENEFICIALLY              investment general partner of ICPI2.         
   OWNED BY EACH              
     REPORTING                
       PERSON                 
        WITH        ------------------------------------------------------------
                    9    SOLE DISPOSITIVE POWER                  -0-
                    ------------------------------------------------------------
                    10   SHARED DISPOSITIVE POWER
                              146,852 shares (see response to Item 8)
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                 146,852 shares
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                            [ ]
- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                        1.08%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*                                               PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>
- --------------------------------------------------------------------------------
CUSIP NO.  220406 10 2                  13D                   Page 6 of 29 Pages
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Integral Capital Partners III, L.P. ("ICP3")
- --------------------------------------------------------------------------------
2    CHECK APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                     (a) [ ]             (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    SOURCE OF FUNDS*                                                      WC
- --------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDING IS REQUIRED  PURSUANT TO ITEMS
     2(d) OR 2(e)                                                          [ ]
- --------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION
          Delaware (limited partnership)
- --------------------------------------------------------------------------------
                    7    SOLE VOTING POWER                       -0-
                    ------------------------------------------------------------
       NUMBER       8    SHARED VOTING POWER
         OF                   111,647   shares  are  directly   owned  by  ICP3.
       SHARES                 Integral  Capital  Management  III,  L.P.  is  the
    BENEFICIALLY              general partner of ICP3.                          
   OWNED BY EACH              
     REPORTING                
       PERSON                 
        WITH        ------------------------------------------------------------
                    9    SOLE DISPOSITIVE POWER                  -0-
                    ------------------------------------------------------------
                    10   SHARED DISPOSITIVE POWER
                              111,647 shares (see response to Item 8)
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                 111,647 shares
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                            [ ]
- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                        0.82%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*                                               PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>
- --------------------------------------------------------------------------------
CUSIP NO.  220406 10 2                  13D                   Page 7 of 29 Pages
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          Integral Capital Partners International III, L.P. ("ICPI3")
- --------------------------------------------------------------------------------
2    CHECK APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                     (a) [ ]             (b) [X]
- --------------------------------------------------------------------------------
3    SEC USE ONLY
- --------------------------------------------------------------------------------
4    SOURCE OF FUNDS*                                                      WC
- --------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDING IS REQUIRED  PURSUANT TO ITEMS
     2(d) OR 2(e)                                                          [ ]
- --------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION
           Cayman Islands (limited partnership)
- --------------------------------------------------------------------------------
                    7    SOLE VOTING POWER                       -0-
                    ------------------------------------------------------------
       NUMBER       8    SHARED VOTING POWER
         OF                   25,360   shares  are  directly   owned  by  ICPI3.
       SHARES                 Integral  Capital  Management  III,  L.P.  is  the
    BENEFICIALLY              investment general partner of ICPI3.              
   OWNED BY EACH              
     REPORTING                
       PERSON                 
        WITH        ------------------------------------------------------------
                    9    SOLE DISPOSITIVE POWER                  -0-
                    ------------------------------------------------------------
                    10   SHARED DISPOSITIVE POWER
                              25,360 shares (see response to Item 8)
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                 25,360 shares
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                            [ ]
- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                        0.19%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*                                               PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

                                                                    Page 8 of 29

                  This statement constitutes Amendment No. 1 to the statement on
Schedule 13D of Corsair Communications, Inc. (the "Issuer") filed on January 26,
1998 (as so amended,  the "Schedule  13D"), by and on behalf of Integral Capital
Management  II,  L.P., a Delaware  limited  partnership  ("ICM2"),  and Integral
Capital  Management  III, L.P., a Delaware  limited  partnership  ("ICM3").  The
principal  business address of ICM2 and ICM3 is 2750 Sand Hill Road, Menlo Park,
California 94025. Capitalized terms not defined herein have the meaning ascribed
to them in the Schedule 13D.

                  Only those items amended are reported herein.




ITEM 6.           CONTRACTS,  ARRANGEMENTS,  UNDERSTANDINGS, OR RELATIONSHIPS
                  WITH RESPECT TO SECURITIES OF THE ISSUER

                  Except  as  set  forth   herein,   there  are  no   contracts,
arrangements,  understandings or relationships among ICM2 or ICM3 and any of the
persons  named in Item 2 or  between  ICM2 or ICM3  and any  other  person  with
respect to the Shares of the Issuer or the persons named in Item 2 and any other
person with respect to the Shares of the Issuer.

                  On May 11, 1998, Integral Capital Partners II, L.P. ("Integral
II")  and  Integral   Capital   Partners   International   II  C.V.   ("Integral
International II") each entered into a Stockholder Voting Agreement with Corsair
Communications, Inc. ("Corsair") and Subscriber Computing, Inc. ("SCI") pursuant
to which Integral II and Integral International II agreed to vote 178,500 shares
and 63,924 shares, respectively,  of Corsair Communications Common Stock held by
them so as to  facilitate  consummation  of the  merger  (the  "Merger")  of SCI
Acquisition Corporation, a wholly-owned subsidiary of Corsair with and into SCI.
Pursuant to the Stockholder  Voting Agreement,  each of Integral II and Integral
International II have granted an irrevocable  proxy to the Board of Directors of
SCI to vote such shares in favor of approval  of the Merger in  accordance  with
the terms and upon the conditions set forth therein

ITEM 7.           MATERIALS TO BE FILED AS EXHIBITS

                  Exhibit A:  Agreement of Joint Filing

                  Exhibit C:  Stockholder  Voting  Agreement dated as of May 11,
                              1998 by and among  Corsair  Communications,  Inc.,
                              Subscriber Computing and Integral Capital Partners
                              II, L.P.

                  Exhibit D:  Stockholder  Voting  Agreement dated as of May 11,
                              1998 by and among  Corsair  Communications,  Inc.,
                              Subscriber Computing and Integral Capital Partners
                              International II, C.V.

<PAGE>

                                                                    Page 9 of 29

                                    SIGNATURE

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.

Dated:  May 12, 1998

                              INTEGRAL CAPITAL MANAGEMENT II, L.P.

                              By:        /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


                              INTEGRAL CAPITAL MANAGEMENT III, L.P.

                              By:        /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partners


                              INTEGRAL CAPITAL PARTNERS II, L.P.

                              By Integral Capital Management II, L.P.,
                              its General Partner

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


                              INTEGRAL CAPITAL PARTNERS III, L.P.

                              By Integral Capital Management III, L.P.
                              its General Partner

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner

<PAGE>

                                                                   Page 10 of 29

                              INTEGRAL CAPITAL PARTNERS INTERNATIONAL II C.V.

                              By Integral Capital Management II, L.P.,
                              its Investment General Partner

                              By:        /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


                              INTEGRAL CAPITAL PARTNERS INTERNATIONAL
                              III, L.P.
                              
                              By Integral Capital Management III, L.P.,
                              its Investment General Partner
                              
                              By:        /s/ Pamela K. Hagenah
                                 ----------------------------------
                              Pamela K. Hagenah
                              a General Partner
<PAGE>

                                                                   Page 11 of 29


                                  EXHIBIT INDEX


                                                                   Found on
                                                                   Sequentially
Exhibit                                                            Numbered Page
- -------                                                            -------------

Exhibit A:        Agreement of Joint Filing                            12

Exhibit C:        Stockholder Voting Agreement dated as of             14
                  May 11, 1998 by and among Corsair
                  Communications, Inc., Subscriber Computing
                  and Integral Capital Partners II, L.P.

Exhibit D:        Stockholder Voting Agreement dated as of             22
                  May 11, 1998 by and among Corsair
                  Communications, Inc., Subscriber Computing
                  and Integral Capital Partners International
                  II, C.V.

<PAGE>

                                                                   Page 12 of 29


                                    EXHIBIT A

                            Agreement of Joint Filing


                  The  undersigned  hereby  agree that they are  filing  jointly
pursuant  to Rule  13d-1(f)(1)  of the  Act the  statement  dated  May 12,  1998
containing the  information  required by Schedule 13D, for the 694,161 Shares of
the Common  Stock of Corsair  Communications,  Inc.,  held by  Integral  Capital
Partners II, L.P., a Delaware  limited  partnership,  Integral  Capital Partners
International  II C.V., a Netherlands  Antilles  limited  partnership,  Integral
Capital Partners III, L.P., a Delaware limited partnership, and Integral Capital
Partners International III, L.P., a Cayman Islands exempted limited partnership.

Date:  May 12, 1998
                              INTEGRAL CAPITAL MANAGEMENT II, L.P.

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


                              INTEGRAL CAPITAL MANAGEMENT III, L.P.

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


                              INTEGRAL CAPITAL PARTNERS II, L.P.

                              By Integral Capital Management II, L.P.,
                              its General Partner

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


                              INTEGRAL CAPITAL PARTNERS INTERNATIONAL II C.V.

                              By Integral Capital Management II, L.P.,
                              its Investment General Partner

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner
<PAGE>

                                                                   Page 13 of 29

                              INTEGRAL CAPITAL PARTNERS III, L.P.

                              By Integral Capital Management III, L.P.,
                              its General Partner

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


                              INTEGRAL CAPITAL PARTNERS INTERNATIONAL
                              III, L.P.

                              By Integral Capital Management III, L.P.,
                              its Investment General Partner

                              By:       /s/ Pamela K. Hagenah
                                 ----------------------------------
                                       Pamela K. Hagenah
                                       a General Partner


<PAGE>
                                                                   Page 14 of 29
 
                                   EXHIBIT C

                          CORSAIR COMMUNICATIONS, INC.
                          STOCKHOLDER VOTING AGREEMENT

         This Stockholder Voting Agreement (the "Agreement") is made and entered
into as of May 11, 1998 by and among  Corsair  Communications,  Inc., a Delaware
corporation  ("Corsair"),  Subscriber  Computing,  Inc., a Delaware  corporation
("SCI"),  and  the  undersigned  stockholder  (the  "Stockholder")  of  Corsair.
Capitalized  terms used herein but not otherwise  defined  herein shall have the
meanings ascribed to them in the Merger Agreement (as defined below).

                                    RECITALS

         A.  Concurrently  with the execution of this  Agreement,  Corsair,  SCI
Acquisition Corporation, a Delaware corporation and a wholly-owned subsidiary of
Corsair  ("Merger  Sub"),  and SCI have entered  into an  Agreement  and Plan of
Reorganization,  dated April 2, 1998 (the "Merger  Agreement"),  which provides,
among other  things,  for the merger (the  "Merger") of Merger Sub with and into
SCI. Pursuant to the Merger Agreement,  all of the issued and outstanding shares
of capital  stock of SCI (the "SCI  Capital  Stock") and all of the  outstanding
options and  warrants to acquire  shares of SCI Capital  Stock will be converted
into the right to receive  shares of the capital  stock of Corsair (the "Corsair
Capital  Stock") and options and warrants to acquire  shares of Corsair  Capital
Stock, respectively.

         B. The  Stockholder is the  beneficial  owner (as defined in Rule 13d-3
under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) with
the right to vote or to  direct  the vote of such  number  of shares of  Capital
Stock as indicated on the signature page of this Agreement (the "Shares").

         C. In  consideration  of the execution of the Merger  Agreement by SCI,
the  Stockholder  agrees to restrict the transfer or  disposition  of any of the
Shares,  agrees to vote or to direct  the vote of the  Shares and any other such
shares  of  Corsair  Capital  Stock  that  it  may  hold  so  as  to  facilitate
consummation of the Merger, and agrees to grant SCI an irrevocable proxy to vote
the Shares and any other such shares of Corsair Capital Stock upon the terms and
subject to the conditions set forth herein.

<PAGE>

                                                                   Page 15 of 29
                                   AGREEMENT

         NOW, THEREFORE,  in consideration of the foregoing and the promises and
covenants contained herein and other good and valuable consideration the receipt
of which is hereby acknowledged, the parties hereto agree as follows:

         1.       Agreement to Retain Shares.

                  1.1 Transfer and Encumbrance.  The Stockholder agrees,  during
the period  beginning on the date hereof and ending on the Expiration  Date, not
to  transfer,  sell,  exchange,  pledge  or  otherwise  dispose  of or  encumber
(collectively,  "Transfer")  any  of  the  Shares.  As  used  herein,  the  term
"Expiration  Date"  shall mean the earlier to occur of (i) such date and time as
the Merger shall become effective in accordance with the terms and provisions of
the  Merger  Agreement  or (ii)  the  termination  of the  Merger  Agreement  in
accordance with its terms.

                  1.2 New  Shares.  The  Stockholder  agrees  that any shares of
Corsair  Capital Stock that the  Stockholder  purchases or with respect to which
the Stockholder  otherwise acquires beneficial  ownership with the right to vote
or direct the voting of such shares,  after the date of this Agreement and prior
to the Expiration Date (collectively, the "New Shares"), shall be subject to the
voting agreement set forth in Section 2 below.

         2. Agreement to Vote Shares.  At every meeting of the  stockholders  of
Corsair  called with respect to any of the following,  and at every  adjournment
thereof,  and on every action or approval by written consent of the stockholders
of Corsair with respect to any of the following,  the Stockholder  shall vote or
direct the vote of the Shares and any New  Shares:  (i) in favor of  approval of
the  Merger  Agreement  and the  Merger  and in favor of any  matter  that could
reasonably be expected to facilitate the Merger and (ii) against approval of any
proposal made in opposition to or in competition with consummation of the Merger
and the Merger  Agreement  (each of the foregoing is referred to as an "Opposing
Proposal").

         3.  Irrevocable   Proxy.   Concurrently  with  the  execution  of  this
Agreement,  the  Stockholder  agrees to deliver to SCI a proxy,  which  shall be
deemed to be coupled  with an  interest,  in the form  attached  as Annex A (the
"Proxy"),  which shall be irrevocable to the extent permitted by applicable law,
covering  the total  number of Shares of capital  stock of Corsair  beneficially
owned (as such term is  defined  in Rule 13d-3  under the  Exchange  Act) by the
Stockholder set forth therein.

         4.  Representations,  Warranties  and  Covenants  of  Stockholder.  The
Stockholder   represents,   warrants  and  covenants  to  SCI  as  follows:  the
Stockholder (i) is the beneficial owner of the Shares, which at the date of this
Agreement and at all times up until the  Expiration  Date will be free and clear
of any liens, claims, options, charges or other encumbrances,  and (ii) has full
power  and  authority  to make,  enter  into  and  carry  out the  terms of this
Agreement and the Proxy.

                                      -2-

<PAGE>

                                                                   Page 16 of 29

         5.  Covenants of Corsair.  Corsair  hereby agrees and covenants that it
will not, and will not cause its stock transfer agent to,  register the transfer
of any of the Shares on the stock  transfer  ledger of Corsair at any time prior
to the termination of this Agreement pursuant to Section 10.

         6.  Additional  Documents.  The Stockholder and Corsair hereby covenant
and agree to execute and deliver any additional  documents  reasonably necessary
or desirable to carry out the purpose and intent of this Agreement.

         7.  Consent and Waiver.  The  Stockholder  hereby gives any consents or
waivers that are reasonably  required for the  consummation  of the Merger under
the terms of any  agreement to which the  Stockholder  is a party or pursuant to
any rights the Stockholder may have.

         8.  Termination.  This Agreement and the Proxy  delivered in connection
herewith  shall  terminate  and shall have no further  force or effect as of the
Expiration Date.

         9.       Miscellaneous.

                  9.1  Severability.   If  any  term,  provision,   covenant  or
restriction of this Agreement is held by a court of competent jurisdiction to be
invalid,  void or  unenforceable,  then the remainder of the terms,  provisions,
covenants  and  restrictions  of this  Agreement  shall remain in full force and
effect and shall in no way be affected, impaired or invalidated.

                  9.2 Binding Effect and  Assignment.  This Agreement and all of
the  provisions  hereof  shall be binding  upon and inure to the  benefit of the
parties  hereto and their  respective  successors  and permitted  assigns,  but,
except as otherwise specifically provided herein, neither this Agreement nor any
of the rights, interests or obligations of the parties hereto may be assigned by
any of the parties without the prior written consent of the other parties.

                  9.3  Amendments  and  Modification.  This Agreement may not be
modified,  amended, altered or supplemented except by the execution and delivery
of a written agreement executed by the parties hereto.

                  9.4  Specific  Performance;  Injunctive  Relief.  The  parties
acknowledge  that Corsair will be  irreparably  harmed and that there will be no
adequate  remedy at law for a violation of any of the covenants or agreements of
the Stockholder set forth herein.  Therefore,  it is agreed that, in addition to
any other  remedies  that may be available  to Corsair upon any such  violation,
Corsair  shall  have the right to  enforce  such  covenants  and  agreements  by
specific  performance,  injunctive  relief or by any other  means  available  to
Corsair at law or in equity.

                  9.5 Notices.  All notices and other  communications  hereunder
shall be in writing  and shall be deemed  given if  delivered  personally  or by
commercial  delivery service,  or mailed by registered or certified mail (return
receipt requested) or sent via facsimile (with

                                      -3-

<PAGE>

                                                                   Page 17 of 29

acknowledgment  of  complete  transmission)  to the  parties  at  the  following
addresses  (or at such other  address for a party as shall be  specified by like
notice):

                           (a)      If to Corsair, to:

                                    Corsair Communications, Inc.
                                    3408 Hillview Avenue
                                    Palo Alto, CA  94304
                                    Attention:  CEO
                                    Telephone No.:  (650) 856-2677
                                    Facsimile No.:  (650) 493-3588

                                    With a copy to:

                                    Brobeck Phleger & Harrison LLP
                                    550 West C Street, Suite 1300
                                    San Diego, California 92101-3532
                                    Attention:  John A. Denniston
                                    Telephone No.:  (619) 234-1966
                                    Facsimile No.:  (619) 234-3848


                           (b)      If to SCI, to:

                                    Subscriber Computing, Inc.
                                    18881 Von Karman Ave., Suite 450
                                    Irvine, CA  92612
                                    Attention:  President
                                    Telephone No.:  (714) 260-1500
                                    Facsimile No.:  (714) 260-1515

                                    With a copy to:

                                    Paul, Hastings, Janofsky & Walker LLP
                                    695 Town Center Drive
                                    17th Floor
                                    Costa Mesa, CA 92626
                                    Attention:  William Simpson, Esq.
                                    Telephone No.:  (714) 668-6205
                                    Facsimile No.:  (714) 979-1921

                           (c) If to the  Stockholder,  to the address set forth
on the last page hereof.

                                      -4-

<PAGE>

                                                                   Page 18 of 29

                  9.6 Governing  Law;  Consent to  Jurisdiction.  This Agreement
shall be governed by,  construed  and enforced in  accordance  with the internal
laws of the State of Delaware,  without  giving effect to any choice or conflict
of law  provision  or rule  (whether  of the  State  of  Delaware  or any  other
jurisdiction)  that would cause the application of the laws of any  jurisdiction
other than the State of Delaware. Corsair and the Stockholder irrevocably submit
to the jurisdiction of any state or federal court sitting in state of California
in any action or  proceeding  arising out of or related to this  Agreement,  and
hereby irrevocably agree that all claims in respect of such action or proceeding
may be heard and  determined  in such state or federal  court.  The  Stockholder
hereby irrevocably consents to the service of process which may be served in any
such action or  proceeding  by certified  mail,  return  receipt  requested,  by
delivering  a copy of such  process to the  Stockholder  or by any other  method
permitted by law.

                  9.7 Entire Agreement. This Agreement and the Proxy contain the
entire  understanding of the parties in respect of the subject matter hereof and
supersede all prior  negotiations  and  understandings  between the parties with
respect to such subject matter.

                  9.8  Counterparts.  This  Agreement may be executed in several
counterparts,  each of which  shall be an  original,  but all of which  together
shall constitute one and the same agreement.

                  9.9 Effect of Headings.  The section  headings  herein are for
convenience only and shall not affect the construction or interpretation of this
Agreement.


                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      -5-

<PAGE>

                                                                   Page 19 of 29

         IN WITNESS  WHEREOF,  the parties have caused this Agreement to be duly
executed on the day and year first above written.


CORSAIR COMMUNICATIONS, INC.        STOCKHOLDER

                                    Name:    INTEGRAL CAPITAL PARTNERS II, L.P.

By:___________________________      By:___________________________
         Name:                               Pamela K. Hagenah
         Title:                     Title:   General Partner

                                    Stockholder's Address for Notice:

SUBSCRIBER COMPUTING, INC.          2750 Sand Hill Road
                                    Menlo Park, CA  94025

By:___________________________
         Name:
         Title:                     Shares beneficially owned:

                                    178,500 shares of Corsair Common Stock




                [SIGNATURE PAGE TO STOCKHOLDER VOTING AGREEMENT]

                                      -6-

<PAGE>

                                                                   Page 20 of 29
                                                                         Annex A

                                IRREVOCABLE PROXY
                                     to Vote
                       Corsair Communications, Inc. Stock

         The undersigned stockholder of Corsair Communications, Inc., a Delaware
corporation ("Corsair"),  hereby irrevocably (to the fullest extent permitted by
applicable  law)  appoints the directors on the Board of Directors of Subscriber
Computing,  Inc., a Delaware  corporation ("SCI"), and each of them, as the sole
and  exclusive  attorneys  and  proxies of the  undersigned,  with full power of
substitution  and  resubstitution,  to vote and  exercise all voting and related
rights (to the fullest  extent that the  undersigned  is entitled to do so) with
respect to the shares of capital  stock of Corsair  indicated  on the  signature
page hereto,  and any and all other shares or  securities  of Corsair  issued or
issuable  in respect  thereof  on or after the date  hereof  (collectively,  the
"Shares") in accordance  with the terms of this Proxy.  The Shares are listed on
the  final  page  of  this  Proxy,   along  with  the  number(s)  of  the  share
certificate(s) which represent such Shares. Upon the undersigned's  execution of
this Proxy,  any and all prior proxies given by the undersigned  with respect to
any  Shares  are  hereby  revoked  and the  undersigned  agrees not to grant any
subsequent  proxies with respect to the Shares until after the  Expiration  Date
(as defined below).

         This Proxy is  granted  pursuant  to that  certain  Stockholder  Voting
Agreement,  dated  as of May  11,  1998,  by and  among  Corsair,  SCI  and  the
undersigned  stockholder  (the  "Stockholder  Agreement"),  and  is  granted  in
consideration  of  SCI  entering  into  that  certain   Agreement  and  Plan  of
Reorganization dated as of April 2, 1998 (the "Merger Agreement"),  by and among
Corsair, SCI Acquisition Corporation,  a Delaware corporation and a wholly-owned
subsidiary of Corsair ("Merger Sub"),  and SCI. The Merger  Agreement  provides,
among other things, for the merger of Merger Sub with and into SCI in accordance
with its terms (the "Merger").  As used herein, the term "Expiration Date" shall
mean the earlier to occur of (i) such date and time as the Merger  shall  become
effective in accordance with the terms and provisions of the Merger Agreement or
(ii) the termination of the Merger Agreement in accordance with its terms.

         The  attorneys and proxies  named above,  and each of them,  are hereby
authorized and empowered by the undersigned, at any time prior to the Expiration
Date, to act as the undersigned's  attorney and proxy to vote the Shares, and to
exercise all voting,  consent and similar rights of the undersigned with respect
to the Shares (including,  without limitation,  the power to execute and deliver
written  consents  pursuant  to  applicable  law) at every  annual,  special  or
adjourned meeting of the stockholders of Corsair and in every written consent in
lieu of any such meeting:  (a) in favor of approval of the Merger  Agreement and
the Merger  and in favor of any matter  that could  reasonably  be  expected  to
facilitate  the  Merger  and  (b)  against  approval  of any  proposal  made  in
opposition  to or in  competition  with the  consummation  of the Merger and the
Merger  Agreement.  The  attorneys and proxies named above may not exercise this
Irrevocable  Proxy on any other matter except as provided in clauses (a) and (b)
above. The undersigned stockholder may vote the Shares on all other matters.


                                      A-1
<PAGE>


                                                                   Page 21 of 29

         Any obligation of the  undersigned  hereunder shall be binding upon the
successors and assigns of the undersigned.

         This Proxy is deemed to be coupled with an interest and is  irrevocable
(to the fullest extent  permitted by Delaware  Corporate  Law). This Proxy shall
terminate,  and be of no  further  force  and  effect,  automatically  upon  the
Expiration Date.


Dated:  May 11, 1998

                                  STOCKHOLDER:

                                  INTEGRAL CAPITAL PARTNERS II, L.P.


                                  By:___________________________________
                                           Pamela K. Hagenah
                                  Title:   General Partner


         Shares beneficially owned:                           Certificate Nos.
         --------------------------                           ----------------

         178,500 shares of Corsair Common Stock                        94



                                      A-2
<PAGE>

                                                                   Page 22 of 29
                                   EXHIBIT D

                          CORSAIR COMMUNICATIONS, INC.
                          STOCKHOLDER VOTING AGREEMENT

         This Stockholder Voting Agreement (the "Agreement") is made and entered
into as of May 11, 1998 by and among  Corsair  Communications,  Inc., a Delaware
corporation  ("Corsair"),  Subscriber  Computing,  Inc., a Delaware  corporation
("SCI"),  and  the  undersigned  stockholder  (the  "Stockholder")  of  Corsair.
Capitalized  terms used herein but not otherwise  defined  herein shall have the
meanings ascribed to them in the Merger Agreement (as defined below).

                                    RECITALS

         A.  Concurrently  with the execution of this  Agreement,  Corsair,  SCI
Acquisition Corporation, a Delaware corporation and a wholly-owned subsidiary of
Corsair  ("Merger  Sub"),  and SCI have entered  into an  Agreement  and Plan of
Reorganization,  dated April 2, 1998 (the "Merger  Agreement"),  which provides,
among other  things,  for the merger (the  "Merger") of Merger Sub with and into
SCI. Pursuant to the Merger Agreement,  all of the issued and outstanding shares
of capital  stock of SCI (the "SCI  Capital  Stock") and all of the  outstanding
options and  warrants to acquire  shares of SCI Capital  Stock will be converted
into the right to receive  shares of the capital  stock of Corsair (the "Corsair
Capital  Stock") and options and warrants to acquire  shares of Corsair  Capital
Stock, respectively.

         B. The  Stockholder is the  beneficial  owner (as defined in Rule 13d-3
under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) with
the right to vote or to  direct  the vote of such  number  of shares of  Capital
Stock as indicated on the signature page of this Agreement (the "Shares").

         C. In  consideration  of the execution of the Merger  Agreement by SCI,
the  Stockholder  agrees to restrict the transfer or  disposition  of any of the
Shares,  agrees to vote or to direct  the vote of the  Shares and any other such
shares  of  Corsair  Capital  Stock  that  it  may  hold  so  as  to  facilitate
consummation of the Merger, and agrees to grant SCI an irrevocable proxy to vote
the Shares and any other such shares of Corsair Capital Stock upon the terms and
subject to the conditions set forth herein.

<PAGE>

                                                                   Page 23 of 29

                                    AGREEMENT

         NOW, THEREFORE,  in consideration of the foregoing and the promises and
covenants contained herein and other good and valuable consideration the receipt
of which is hereby acknowledged, the parties hereto agree as follows:

         1.       Agreement to Retain Shares.

                  1.1 Transfer and Encumbrance.  The Stockholder agrees,  during
the period  beginning on the date hereof and ending on the Expiration  Date, not
to  transfer,  sell,  exchange,  pledge  or  otherwise  dispose  of or  encumber
(collectively,  "Transfer")  any  of  the  Shares.  As  used  herein,  the  term
"Expiration  Date"  shall mean the earlier to occur of (i) such date and time as
the Merger shall become effective in accordance with the terms and provisions of
the  Merger  Agreement  or (ii)  the  termination  of the  Merger  Agreement  in
accordance with its terms.

                  1.2 New  Shares.  The  Stockholder  agrees  that any shares of
Corsair  Capital Stock that the  Stockholder  purchases or with respect to which
the Stockholder  otherwise acquires beneficial  ownership with the right to vote
or direct the voting of such shares,  after the date of this Agreement and prior
to the Expiration Date (collectively, the "New Shares"), shall be subject to the
voting agreement set forth in Section 2 below.

         2. Agreement to Vote Shares.  At every meeting of the  stockholders  of
Corsair  called with respect to any of the following,  and at every  adjournment
thereof,  and on every action or approval by written consent of the stockholders
of Corsair with respect to any of the following,  the Stockholder  shall vote or
direct the vote of the Shares and any New  Shares:  (i) in favor of  approval of
the  Merger  Agreement  and the  Merger  and in favor of any  matter  that could
reasonably be expected to facilitate the Merger and (ii) against approval of any
proposal made in opposition to or in competition with consummation of the Merger
and the Merger  Agreement  (each of the foregoing is referred to as an "Opposing
Proposal").

         3.  Irrevocable   Proxy.   Concurrently  with  the  execution  of  this
Agreement,  the  Stockholder  agrees to deliver to SCI a proxy,  which  shall be
deemed to be coupled  with an  interest,  in the form  attached  as Annex A (the
"Proxy"),  which shall be irrevocable to the extent permitted by applicable law,
covering  the total  number of Shares of capital  stock of Corsair  beneficially
owned (as such term is  defined  in Rule 13d-3  under the  Exchange  Act) by the
Stockholder set forth therein.

         4.  Representations,  Warranties  and  Covenants  of  Stockholder.  The
Stockholder   represents,   warrants  and  covenants  to  SCI  as  follows:  the
Stockholder (i) is the beneficial owner of the Shares, which at the date of this
Agreement and at all times up until the  Expiration  Date will be free and clear
of any liens, claims, options, charges or other encumbrances,  and (ii) has full
power  and  authority  to make,  enter  into  and  carry  out the  terms of this
Agreement and the Proxy.

                                      -2-
<PAGE>

                                                                   Page 24 of 29

         5.  Covenants of Corsair.  Corsair  hereby agrees and covenants that it
will not, and will not cause its stock transfer agent to,  register the transfer
of any of the  Shares or New Shares on the stock  transfer  ledger of Corsair at
any time prior to the termination of this Agreement pursuant to Section 10.

         6.  Additional  Documents.  The Stockholder and Corsair hereby covenant
and agree to execute and deliver any additional  documents  reasonably necessary
or desirable to carry out the purpose and intent of this Agreement.

         7.  Consent and Waiver.  The  Stockholder  hereby gives any consents or
waivers that are reasonably  required for the  consummation  of the Merger under
the terms of any  agreement to which the  Stockholder  is a party or pursuant to
any rights the Stockholder may have.

         8.  Termination.  This Agreement and the Proxy  delivered in connection
herewith  shall  terminate  and shall have no further  force or effect as of the
Expiration Date.

         9.       Miscellaneous.

                  9.1  Severability.   If  any  term,  provision,   covenant  or
restriction of this Agreement is held by a court of competent jurisdiction to be
invalid,  void or  unenforceable,  then the remainder of the terms,  provisions,
covenants  and  restrictions  of this  Agreement  shall remain in full force and
effect and shall in no way be affected, impaired or invalidated.

                  9.2 Binding Effect and  Assignment.  This Agreement and all of
the  provisions  hereof  shall be binding  upon and inure to the  benefit of the
parties  hereto and their  respective  successors  and permitted  assigns,  but,
except as otherwise specifically provided herein, neither this Agreement nor any
of the rights, interests or obligations of the parties hereto may be assigned by
any of the parties without the prior written consent of the other parties.

                  9.3  Amendments  and  Modification.  This Agreement may not be
modified,  amended, altered or supplemented except by the execution and delivery
of a written agreement executed by the parties hereto.

                  9.4  Specific  Performance;  Injunctive  Relief.  The  parties
acknowledge  that Corsair will be  irreparably  harmed and that there will be no
adequate  remedy at law for a violation of any of the covenants or agreements of
the Stockholder set forth herein.  Therefore,  it is agreed that, in addition to
any other  remedies  that may be available  to Corsair upon any such  violation,
Corsair  shall  have the right to  enforce  such  covenants  and  agreements  by
specific  performance,  injunctive  relief or by any other  means  available  to
Corsair at law or in equity.

                  9.5 Notices.  All notices and other  communications  hereunder
shall be in writing  and shall be deemed  given if  delivered  personally  or by
commercial  delivery service,  or mailed by registered or certified mail (return
receipt requested) or sent via facsimile (with

                                      -3-
<PAGE>

                                                                   Page 25 of 29

acknowledgment  of  complete  transmission)  to the  parties  at  the  following
addresses  (or at such other  address for a party as shall be  specified by like
notice):

                           (a)      If to Corsair, to:

                                    Corsair Communications, Inc.
                                    3408 Hillview Avenue
                                    Palo Alto, CA  94304
                                    Attention:  CEO
                                    Telephone No.:  (650) 856-2677
                                    Facsimile No.:  (650) 493-3588

                                    With a copy to:

                                    Brobeck Phleger & Harrison LLP
                                    550 West C Street, Suite 1300
                                    San Diego, California 92101-3532
                                    Attention:  John A. Denniston
                                    Telephone No.:  (619) 234-1966
                                    Facsimile No.:  (619) 234-3848


                           (b)      If to SCI, to:

                                    Subscriber Computing, Inc.
                                    18881 Von Karman Ave., Suite 450
                                    Irvine, CA  92612
                                    Attention:  President
                                    Telephone No.:  (714) 260-1500
                                    Facsimile No.:  (714) 260-1515

                                    With a copy to:

                                    Paul, Hastings, Janofsky & Walker LLP
                                    695 Town Center Drive
                                    17th Floor
                                    Costa Mesa, CA 92626
                                    Attention:  William Simpson, Esq.
                                    Telephone No.:  (714) 668-6205
                                    Facsimile No.:  (714) 979-1921

                           (c) If to the  Stockholder,  to the address set forth
on the last page hereof.

                                      -4-
<PAGE>

                                                                   Page 26 of 29

                  9.6 Governing  Law;  Consent to  Jurisdiction.  This Agreement
shall be governed by,  construed  and enforced in  accordance  with the internal
laws of the State of Delaware,  without  giving effect to any choice or conflict
of law  provision  or rule  (whether  of the  State  of  Delaware  or any  other
jurisdiction)  that would cause the application of the laws of any  jurisdiction
other than the State of Delaware. Corsair and the Stockholder irrevocably submit
to the jurisdiction of any state or federal court sitting in state of California
in any action or  proceeding  arising out of or related to this  Agreement,  and
hereby irrevocably agree that all claims in respect of such action or proceeding
may be heard and  determined  in such state or federal  court.  The  Stockholder
hereby irrevocably consents to the service of process which may be served in any
such action or  proceeding  by certified  mail,  return  receipt  requested,  by
delivering  a copy of such  process to the  Stockholder  or by any other  method
permitted by law.

                  9.7 Entire Agreement. This Agreement and the Proxy contain the
entire  understanding of the parties in respect of the subject matter hereof and
supersede all prior  negotiations  and  understandings  between the parties with
respect to such subject matter.

                  9.8  Counterparts.  This  Agreement may be executed in several
counterparts,  each of which  shall be an  original,  but all of which  together
shall constitute one and the same agreement.

                  9.9 Effect of Headings.  The section  headings  herein are for
convenience only and shall not affect the construction or interpretation of this
Agreement.





                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      -5-
<PAGE>

                                                                   Page 27 of 29

         IN WITNESS  WHEREOF,  the parties have caused this Agreement to be duly
executed on the day and year first above written.


CORSAIR COMMUNICATIONS, INC.        STOCKHOLDER

                                    Name:    INTEGRAL CAPITAL PARTNERS
                                             INTERNATIONAL II, C.V.


By:_________________________        By:_______________________________________
         Name:                               Pamela K. Hagenah
         Title:                     Title:   General Partner

                                    Stockholder's Address for Notice:

SUBSCRIBER COMPUTING, INC.          2750 Sand Hill Road
                                    Menlo Park, CA  94025

By:_________________________
         Name:
         Title:                     Shares beneficially owned:

                                    63,924 shares of Corsair Common Stock

















                [SIGNATURE PAGE TO STOCKHOLDER VOTING AGREEMENT]

                                      -6-
<PAGE>

                                                                   Page 28 of 29
                                                                         Annex A

                                IRREVOCABLE PROXY
                                     to Vote
                       Corsair Communications, Inc. Stock


         The undersigned stockholder of Corsair Communications, Inc., a Delaware
corporation ("Corsair"),  hereby irrevocably (to the fullest extent permitted by
applicable  law)  appoints the directors on the Board of Directors of Subscriber
Computing,  Inc., a Delaware  corporation ("SCI"), and each of them, as the sole
and  exclusive  attorneys  and  proxies of the  undersigned,  with full power of
substitution  and  resubstitution,  to vote and  exercise all voting and related
rights (to the fullest  extent that the  undersigned  is entitled to do so) with
respect to the shares of capital  stock of Corsair  indicated  on the  signature
page hereto,  and any and all other shares or  securities  of Corsair  issued or
issuable  in respect  thereof  on or after the date  hereof  (collectively,  the
"Shares") in accordance  with the terms of this Proxy.  The Shares are listed on
the  final  page  of  this  Proxy,   along  with  the  number(s)  of  the  share
certificate(s) which represent such Shares. Upon the undersigned's  execution of
this Proxy,  any and all prior proxies given by the undersigned  with respect to
any  Shares  are  hereby  revoked  and the  undersigned  agrees not to grant any
subsequent  proxies with respect to the Shares until after the  Expiration  Date
(as defined below).

         This Proxy is  granted  pursuant  to that  certain  Stockholder  Voting
Agreement,  dated  as of May  11,  1998,  by and  among  Corsair,  SCI  and  the
undersigned  stockholder  (the  "Stockholder  Agreement"),  and  is  granted  in
consideration  of  SCI  entering  into  that  certain   Agreement  and  Plan  of
Reorganization dated as of April 2, 1998 (the "Merger Agreement"),  by and among
Corsair, SCI Acquisition Corporation,  a Delaware corporation and a wholly-owned
subsidiary of Corsair ("Merger Sub"),  and SCI. The Merger  Agreement  provides,
among other things, for the merger of Merger Sub with and into SCI in accordance
with its terms (the "Merger").  As used herein, the term "Expiration Date" shall
mean the earlier to occur of (i) such date and time as the Merger  shall  become
effective in accordance with the terms and provisions of the Merger Agreement or
(ii) the termination of the Merger Agreement in accordance with its terms.

         The  attorneys and proxies  named above,  and each of them,  are hereby
authorized and empowered by the undersigned, at any time prior to the Expiration
Date, to act as the undersigned's  attorney and proxy to vote the Shares, and to
exercise all voting,  consent and similar rights of the undersigned with respect
to the Shares (including,  without limitation,  the power to execute and deliver
written  consents  pursuant  to  applicable  law) at every  annual,  special  or
adjourned meeting of the stockholders of Corsair and in every written consent in
lieu of any such meeting:  (a) in favor of approval of the Merger  Agreement and
the Merger  and in favor of any matter  that could  reasonably  be  expected  to
facilitate  the  Merger  and  (b)  against  approval  of any  proposal  made  in
opposition  to or in  competition  with the  consummation  of the Merger and the
Merger  Agreement.  The  attorneys and proxies named above may not exercise this
Irrevocable  Proxy on any other matter except as provided in clauses (a) and (b)
above. The

                                      A-1
<PAGE>

                                                                   Page 29 of 29

undersigned stockholder may vote the Shares on all other matters.

         Any obligation of the  undersigned  hereunder shall be binding upon the
successors and assigns of the undersigned.

         This Proxy is deemed to be coupled with an interest and is  irrevocable
(to the fullest extent  permitted by Delaware  Corporate  Law). This Proxy shall
terminate,  and be of no  further  force  and  effect,  automatically  upon  the
Expiration Date.


Dated:  May 11, 1998

                                  STOCKHOLDER:

                                  INTEGRAL CAPITAL PARTNERS
                                  INTERNATIONAL II, C.V.


                                  By:_______________________________________
                                           Pamela K. Hagenah
                                  Title:   General Partner


         Shares beneficially owned:                       Certificate Nos.
         --------------------------                       ----------------

         63,924 shares of Corsair Common Stock                     95


                                      A-2


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