INTEGRAL CAPITAL MANAGEMENT II LP
SC 13D/A, 1998-07-06
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3)*

                          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)

                                  July 1, 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:  Schedules  filed in paper format shall include a signed original
and five copies of the schedule,  including all exhibits.  See Rule 13d-7(b) 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 23 Pages
                       Exhibit Index Contained on Page 20

<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 2 of 23 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 directly owned by
                SHARES                                     Integral Capital Partners II, L.P. ("ICP2") and 146,852 shares
             BENEFICIALLY                                  are directly owned by Integral Capital Partners International II
            OWNED BY EACH                                  C.V. ("ICPI2"). ICM2 is the general partner of ICP2 and the
              REPORTING                                    investment general partner of ICPI2.
                PERSON                  --------- ----------------------------------------------------------------------------
                 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                                                               4.05%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 3 of 23 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                                       418,277 shares, of which 340,657 shares are directly owned by    
                SHARES                                     Integral Capital Partners III, L.P. ("ICP3") and 77,620 shares   
             BENEFICIALLY                                  are directly owned by Integral Capital Partners International    
            OWNED BY EACH                                  III, L.P. ("ICPI3").  ICM3 is the general partner of ICP3 and the
              REPORTING                                    investment general partner of ICPI3.                             
                PERSON                  --------- ----------------------------------------------------------------------------
                 WITH                      9      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           10     SHARED DISPOSITIVE POWER
                                                           418,277  shares  (see response to Item 8)
- ----------- ------------------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              418,277 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                                                                           [ ]
- ----------- ------------------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                                                               3.04%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>



<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 4 of 23 Pages
- -----------------------------------------------------------                 --------------------------------------------------
- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Management IV, LLC ("ICM4")
- ----------- ------------------------------------------------------------------------------------------------------------------
    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 liability company)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           7      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     8      SHARED VOTING POWER
                  OF                                       446,540 shares which shares are directly owned by Integral       
                SHARES                                     Capital Partners IV, L.P. ("ICP4").  ICM4 is the general partner 
             BENEFICIALLY                                  of ICP4.                                                         
            OWNED BY EACH                                  
              REPORTING                                    
                PERSON                  --------- ----------------------------------------------------------------------------
                 WITH                      9      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           10     SHARED DISPOSITIVE POWER
                                                            446,540 shares  (see response to Item 8)
- ----------- ------------------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              446,540 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                                                                           [ ]
- ----------- ------------------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                                                               3.25%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      OO
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>



<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 5 of 23 Pages
- -----------------------------------------------------------                 --------------------------------------------------
- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     ICP MS Management, LLC ("ICP Management")
- ----------- ------------------------------------------------------------------------------------------------------------------
    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 liability company)
- --------------------------------------- --------- ----------------------------------------------------------------------------
                                           7      SOLE VOTING POWER                   -0-
                                        --------- ----------------------------------------------------------------------------
                NUMBER                     8      SHARED VOTING POWER
                  OF                                       2,190 shares which shares are directly owned by Integral Capital  
                SHARES                                     Partners IV MS Side Fund, L.P. ("ICP4 Side Fund").  ICP           
             BENEFICIALLY                                  Management is the general partner of ICP4 Side Fund.              
            OWNED BY EACH                                  
              REPORTING                                    
                PERSON                  --------- ----------------------------------------------------------------------------
                 WITH                      9      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           10     SHARED DISPOSITIVE POWER
                                                           2,190  shares  (see response to Item 8)
- ----------- ------------------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                                2,190 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                                                                           [ ]
- ----------- ------------------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                                                               0.02%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      OO
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 6 of 23 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.  Integral Capital 
                SHARES                                     Management II, L.P. is the general partner of ICP2.          
             BENEFICIALLY                                  
            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                                                               2.98%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>



<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 7 of 23 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.  Integral Capital     
                SHARES                                     Management II, L.P. is the investment general partner of ICPI2.   
             BENEFICIALLY                                  
            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                                                               1.07%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>



<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 8 of 23 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                                       340,657 shares are directly owned by ICP3.  Integral Capital     
                SHARES                                     Management III, L.P. is the general partner of ICP3.             
             BENEFICIALLY                                  
            OWNED BY EACH                                  
              REPORTING                                    
                PERSON                  --------- ----------------------------------------------------------------------------
                 WITH                      9      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           10     SHARED DISPOSITIVE POWER
                                                           340,657  shares  (see response to Item 8)
- ----------- ------------------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              340,657 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                                                                           [ ]
- ----------- ------------------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                                                               2.48%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>



<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 9 of 23 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                                       77,620 shares are directly owned by ICPI3.  Integral Capital      
                SHARES                                     Management III, L.P. is the investment general partner of ICPI3.  
             BENEFICIALLY                                  
            OWNED BY EACH                                  
              REPORTING                                    
                PERSON                  --------- ----------------------------------------------------------------------------
                 WITH                      9      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           10     SHARED DISPOSITIVE POWER
                                                           77,620  shares  (see response to Item 8)
- ----------- ------------------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              77,620 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                                                                           [ ]
- ----------- ------------------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                                                               0.56%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 10 of 23 Pages
- -----------------------------------------------------------                 --------------------------------------------------
- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Partners IV, L.P. ("ICP4")
- ----------- ------------------------------------------------------------------------------------------------------------------
    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                                       446,540 shares are directly owned by ICP4. Integral Capital  
                SHARES                                     Management IV, LLC is the general partner of ICP4.           
             BENEFICIALLY                                  
            OWNED BY EACH                                  
              REPORTING                                    
                PERSON                  --------- ----------------------------------------------------------------------------
                 WITH                      9      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           10     SHARED DISPOSITIVE POWER
                                                           446,540  shares  (see response to Item 8)
- ----------- ------------------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              446,540 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                                                                           [ ]
- ----------- ------------------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                                                               3.25%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                              <C>        <C>
- -----------------------------------------------------------                 --------------------------------------------------
CUSIP NO.  220406 10 2                                           13D        Page 11 of 23 Pages
- -----------------------------------------------------------                 --------------------------------------------------
- ----------- ------------------------------------------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                     Integral Capital Partners IV MS Side Fund, L.P. ("ICP4 Side Fund ")
- ----------- ------------------------------------------------------------------------------------------------------------------
    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                                       2,190 shares are directly  owned by ICP4 Side Fund.  ICP MS         
                SHARES                                     Management, LLC is the general partner of ICP4 Side Fund.           
             BENEFICIALLY                                  
            OWNED BY EACH                                  
              REPORTING                                    
                PERSON                  --------- ----------------------------------------------------------------------------
                 WITH                      9      SOLE DISPOSITIVE POWER              -0-
                                        --------- ----------------------------------------------------------------------------
                                           10     SHARED DISPOSITIVE POWER
                                                            2,190 shares  (see response to Item 8)
- ----------- ------------------------------------------------------------------------------------------------------------------
    11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                                                                                              2,190 shares
- ----------- ------------------------------------------------------------------------------------------------------------------
    12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*
                                                                                                                           [ ]
- ----------- ------------------------------------------------------------------------------------------------------------------
    13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW                                                               0.02%
- ----------- ------------------------------------------------------------------------------------------------------------------
    14      TYPE OF REPORTING PERSON*                                                                                      PN
- ----------- ------------------------------------------------------------------------------------------------------------------
<FN>
                                             *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

                                                                   Page 12 of 23

                  This statement constitutes Amendment No. 3 to the statement on
Schedule 13D of Corsair Communications, Inc. (the "Issuer") filed on January 26,
1998 and as amended by  Amendment  No. 1 filed on May 13, 1998 and by  Amendment
No. 2 filed on June 19,  1998 (as so amended,  the  "Schedule  13D"),  by and on
behalf of Integral Capital  Management II, L.P., a Delaware limited  partnership
("ICM2"),  Integral Capital Management III, L.P., a Delaware limited partnership
("ICM3"),  Integral  Capital  Management IV, LLC, a Delaware  limited  liability
company  ("ICM4")  and ICP MS  Management,  LLC,  a Delaware  limited  liability
company  ("ICP  Management").  Capitalized  terms not  defined  herein  have the
meaning ascribed to them in the Schedule 13D.

                  Only those items amended are reported herein.


ITEM 2.  IDENTITY AND BACKGROUND

                  This statement is being filed by Integral  Capital  Management
II, L.P., a Delaware limited partnership  ("ICM2"),  Integral Capital Management
III, L.P., a Delaware limited partnership ("ICM3"),  Integral Capital Management
IV, LLC, a Delaware  limited  liability  company ("ICM4") and ICP MS Management,
LLC, a Delaware  limited  liability  company ("ICP  Management").  The principal
business  address of ICM2, ICM3, ICM4 and ICP Management is 2750 Sand Hill Road,
Menlo Park,  California 94025. The names,  business  addresses,  occupations and
citizenships  of the general  partners and managers of ICM2,  ICM3, ICM4 and ICP
Management are set forth on Exhibit B, Exhibit E and Exhibit F hereto.

                  ICM2 is the general partner of Integral  Capital  Partners II,
L.P.,  a Delaware  limited  partnership  ("ICP2"),  and the  investment  general
partner of  Integral  Capital  Partners  International  II C.V.,  a  Netherlands
Antilles limited partnership ("ICPI2").  ICM3 is the general partner of Integral
Capital Partners III, L.P., a Delaware  limited  partnership  ("ICP3"),  and the
investment general partner of Integral Capital Partners International III, L.P.,
a Cayman Islands exempted  limited  partnership  ("ICPI3").  ICM4 is the general
partner of Integral Capital  Partners IV, L.P., a Delaware  limited  partnership
("ICP4").  ICP Management is the general partner of Integral Capital Partners IV
MS Side Fund, L.P., a Delaware  limited  partnership  ("ICP4 Side Fund").  ICP2,
ICPI2,  ICP3, ICPI3,  ICP4 and ICP4 Side Fund are private  investment funds that
invest in securities of publicly traded and private companies,  predominantly in
the areas of information sciences and life sciences. With respect to ICM2, ICM3,
ICM4 and ICP Management,  this statement relates only to ICM2's,  ICM3's, ICM4's
and ICP Management's indirect, beneficial ownership of shares of Common Stock of
Corsair Communications,  Inc. (the "Shares").  The Shares have been purchased by
ICP2, ICPI2,  ICP3, ICPI3, ICP4 and ICP4 Side Fund, and none of ICM2, ICM3, ICM4
or ICP  Management  directly or  otherwise  hold any Shares.  Management  of the
business  affairs of ICM2,  ICM3, ICM4 and ICP Management,  including  decisions
respecting disposition and/or voting of the Shares, resides in a majority of the
general partners of ICM2, ICM3, ICM4 and ICP Management, respectively, listed on
Exhibit B, Exhibit E and Exhibit F, such that no single general partner of ICM2,
ICM3, ICM4 or ICP Management has voting and/or dispositive power of the Shares.

                  Neither ICM2,  ICM3,  ICM4, ICP Management nor, to the best of
ICM2's, ICM3's ICM4's and ICP Management's knowledge,  any of the persons listed
on Exhibit B, Exhibit E and Exhibit F hereto  have,  during the last five years,
been convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors)  or  been  a  party  to  a  civil  proceeding  of  a  judicial  or
administrative body of competent jurisdiction and as a result of such proceeding
was or


<PAGE>

                                                                   Page 13 of 23

is subject to a judgment,  decree or final order enjoining future violations of,
or prohibiting or mandating  activities  subject to federal or state  securities
laws or finding any violation with respect to such laws.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

                  The aggregate amount of consideration required by ICP2, ICPI2,
ICP3,  ICPI3,  ICP4 and ICP4 Side Fund to purchase the 1,424,161 shares to which
this statement  relates was  approximately  $14,596,200.  The  consideration was
obtained from the working capital of ICP2,  ICPI2,  ICP3,  ICPI3,  ICP4 and ICP4
Side Fund.


ITEM 4.  PURPOSE OF TRANSACTION

                  The  purchase  of  392,914  shares by ICP2 and ICPI2 were made
pursuant to a series of private purchases. The purchases of the remaining Shares
by ICP2,  ICPI2,  ICP3,  ICPI3, ICP4 and ICP4 Side Fund were made in the initial
public  offering of common  stock by the Issuer  and/or  pursuant to open market
purchases.  The  purchases  of the  Shares  were  not made  for the  purpose  of
acquiring  control of the Issuer.  From time to time,  ICM2 may, in the ordinary
course of its role as general partner of ICP2 and the investment general partner
of ICPI2,  direct ICP2 and/or ICPI2 to purchase additional shares or sell all or
a portion of the Shares now held by ICP2 or ICPI2, and ICM3 may, in the ordinary
course of its role as general partner of ICP3 and the investment general partner
of ICPI3,  direct ICP3 and/or ICPI3 to purchase additional shares or sell all or
a portion of the Shares now held by ICP3 or ICPI3.  From time to time, ICM4 may,
in the ordinary  course of its role as general  partner of ICP4,  direct ICP4 to
purchase  additional  shares or sell all or a portion  of the Shares now held by
ICP4,  and ICP  Management  may, in the  ordinary  course of its role as general
partner of ICP4 Side Fund,  direct ICP4 Side Fund to purchase  additional shares
or sell all or a portion of the Shares now held by ICP4 Side Fund.

                  Except as set  forth  above,  none of ICM2,  ICM3,  ICM4,  ICP
Management  nor the persons  listed on Exhibit B, Exhibit E and Exhibit F hereto
has any  current  plans or  proposals  that  relate  to or would  result  in the
occurrence of any of the actions or events  enumerated in clause (a) through (j)
of Item 4 of Schedule 13D.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

         A.       Integral Capital Management II, L.P. ("ICM2")

                  (a)      Amount Beneficially Owned: 557,154
                           Percent of Class:  4.05%
                  (b)      Number of shares as to which such person has:
                           1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    557,154
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 557,154

                  (c) To the best  knowledge  of ICM2,  no  transactions  in the
Shares were  effected  during the 60 days prior to July 1, 1998 through the date
hereof by Integral  Capital  Partners II, L.P., a Delaware  limited  partnership
("ICP2"),  Integral  Capital  Partners  International  II  C.V.,  a  Netherlands
Antilles limited  partnership  ("ICPI2"),  ICM2, or any of the persons listed as
general partners of ICM2 on Exhibit B hereto.


<PAGE>


                                                                   Page 14 of 23

                  (d) ICM2 is the  general  partner  of ICP2 and the  investment
general partner of ICPI2. Roger B. McNamee, John A. Powell and Pamela K. Hagenah
are the general partners of ICM2.  Decisions respecting the voting of Shares and
disposition of the proceeds from the sale of Shares are determined by a majority
of the general  partners.  Under certain  circumstances set forth in the limited
partnership agreements of ICP2, ICPI2 and ICM2, the general and limited partners
of such  entities may receive  dividends  from, or the proceeds from the sale of
Shares of Common  Stock of  Corsair  Communications,  Inc.  owned,  directly  or
indirectly, by each such entity.

                  (e) Not applicable.

         B.       Integral Capital Management III, L.P. ("ICM3")

                  (a)      Amount Beneficially Owned: 418,277
                           Percent of Class:  3.04%
                  (b)      Number of shares as to which such person has:
                           1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    418,277
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 418,277

                  (c) To the best knowledge of ICM3, the only transaction in the
Shares effected during the 60 days prior to July 1, 1998 through the date hereof
by Integral Capital Partners III, L.P., a Delaware limited partnership ("ICP3"),
Integral  Capital  Partners  International  III, L.P., a Cayman Islands exempted
limited  partnership  ("ICPI3"),  ICM3, or any of the persons  listed as general
partners of ICM3 on Exhibit B hereto  occurred on June 25,  1998,  when ICP3 and
ICPI3 made an open  market  purchase  of 22,510  shares and 5,180  shares of the
Issuer's Common Stock, respectively, for a consideration per share of $8.50, and
on July 1, 1998,  when ICP3 and ICPI3 made an open  market  purchase  of 186,990
shares and 42,610  shares of the  Issuer's  Common  Stock,  respectively,  for a
consideration per share of $8.75.

                  (d) ICM3 is the  general  partner  of ICP3 and the  investment
general partner of ICPI3. Roger B. McNamee, John A. Powell and Pamela K. Hagenah
are the general partners of ICM3.  Decisions respecting the voting of Shares and
disposition of the proceeds from the sale of Shares are determined by a majority
of the general  partners.  Under certain  circumstances set forth in the limited
partnership agreements of ICP3, ICPI3 and ICM3, the general and limited partners
of such  entities may receive  dividends  from, or the proceeds from the sale of
Shares of Common  Stock of  Corsair  Communications,  Inc.  owned,  directly  or
indirectly, by each such entity.

                  (e) Not applicable.

         C.       Integral Capital Management IV, LLC

                  (a)      Aggregate number of Shares owned: 446,540
                           Percentage:   3.25%
                  (b)      Number of shares as to which such person has:
                           1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    446,540
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 446,540


<PAGE>


                                                                   Page 15 of 23

                  (c) To the best knowledge of ICM4, the only transaction in the
Shares effected during the 60 days prior to July 1, 1998 through the date hereof
by Integral Capital Partners IV, L.P., a Delaware limited partnership  ("ICP4"),
ICM4,  or any of the  persons  listed as  managers  of ICM4 on  Exhibit E hereto
occurred  on June 25,  1998,  when ICP4 made an open  market  purchase of 22,310
shares of the Issuer's Common Stock for a consideration  per share of $8.50, and
on July 1, 1998, when ICP4 made an open market purchase of 248,210 shares of the
Issuer's Common Stock for a consideration per share of $8.75.

                  (d) ICM4 is the  general  partner of ICP4.  Roger B.  McNamee,
John A.  Powell  and  Pamela K.  Hagenah  are the  managers  of ICM4.  Decisions
respecting the voting of Shares and disposition of the proceeds from the sale of
Shares are determined by a majority of the managers. Under certain circumstances
set  forth  in the  limited  partnership  agreements  of ICP4  and  the  limited
liability company operating  agreement of ICM4, the general and limited partners
and the managers and members of such entities may receive dividends from, or the
proceeds from the sale of Shares of Common Stock of Corsair Communications, Inc.
owned, directly or indirectly, by each such entity.

                  (e)      Not applicable.

         D.       ICP MS Management, LLC

                  (a)      Aggregate number of Shares owned: 2,190
                           Percentage:  0.02%
                  (b)      1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    2,190
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 2,190

                  (c)  To  the  best  knowledge  of  ICM  Management,  the  only
transaction  in the  Shares  effected  during  the 60 days prior to July 1, 1998
through the date hereof by Integral  Capital  Partners IV MS Side Fund,  L.P., a
Delaware limited  partnership ("ICP4 Side Fund"), ICM Management,  or any of the
persons  listed as managers of ICM  Management  on Exhibit F hereto  occurred on
July 1, 1998,  when ICP4 Side Fund made an open market  purchase of 2,190 shares
of the Issuer's Common Stock for a consideration per share of $8.75.

                  (d) ICM  Management is the general  partner of ICP4 Side Fund.
Roger B.  McNamee,  John A. Powell and Pamela K. Hagenah are the managers of ICM
Management.  Decisions  respecting  the voting of Shares and  disposition of the
proceeds  from the sale of Shares are  determined by a majority of the managers.
Under certain  circumstances set forth in the limited partnership  agreements of
ICP4 Side Fund and the limited  liability  company  operating  agreement of ICM4
Side Fund, the general and limited partners and the managers and members of such
entities may receive  dividends from, or the proceeds from the sale of Shares of
Common Stock of Corsair Communications,  Inc. owned, directly or indirectly,  by
each such entity.

<PAGE>

                                                                   Page 16 of 23

         E.       Integral Capital Partners II, L.P.

                  (a)      Aggregate number of Shares owned:  410,302
                           Percentage:  2.98%
                  (b)      1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    410,302
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 410,302
                  (c)      See item 5A(c) above.
                  (d)      See Item 5A(d) above.
                  (e)      Not applicable.

         F.       Integral Capital Partners International II C.V.

                  (a)      Aggregate number of Shares owned:  146,852
                           Percentage:  1.07%
                  (b)      1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    146,852
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 146,852
                  (c)      See Item 5A(c) above.
                  (d)      See Item 5A(d) above.
                  (e)      Not applicable.

         G.       Integral Capital Partners III, L.P.

                  (a)      Aggregate number of Shares owned:  340,657
                           Percentage: 2.48%
                  (b)      1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    340,657
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 340,657
                  (c)      See Item 5B(c) above.
                  (d)      See Item 5B(d) above.
                  (e)      Not applicable.

         H.       Integral Capital Partners International III, L.P.

                  (a)      Aggregate number of Shares owned:  77,620
                           Percentage: 0.56%
                  (b)      1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    77,620
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 77,620
                  (c)      See Item 5B(c) above.
                  (d)      See Item 5B(d) above.
                  (e)      Not applicable.


<PAGE>


                                                                   Page 17 of 23

         I.       Integral Capital Partners IV, L.P.

                  (a)      Aggregate number of Shares owned:  446,540
                           Percentage:  3.25%
                  (b)      1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    446,540
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 446,540
                  (c)      See Item 5C(c) above.
                  (d)      See Item 5C(d) above.
                  (e)      Not applicable.

         J.       Integral Capital Partners IV MS Side Fund, L.P.

                  (a)      Aggregate number of Shares owned:  2,190
                           Percentage:  0.02%
                  (b)      1.       Sole power to vote or to direct vote: -0-
                           2.       Shared  power  to  vote or to  direct  vote:
                                    2,190
                           3.       Sole  power  to  dispose  or to  direct  the
                                    disposition: -0-
                           4.       Shared  power to  dispose  or to direct  the
                                    disposition: 2,190
                  (c)      See Item 5D(c) above.
                  (d)      See Item 5D(d) above.
                  (e)      Not applicable.

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

                  There  are  no  contracts,  arrangements,   understandings  or
relationships  among ICM2,  ICM3,  ICM4 or ICP Management and any of the persons
named in Item 2 or between  ICM2,  ICM3,  ICM4 or ICP  Management  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.


ITEM 7.  MATERIALS TO BE FILED AS EXHIBITS

                  Exhibit A:     Agreement of Joint Filing

                  Exhibit F:     Managers of ICP MS Management, LLC



<PAGE>

                                                                   Page 18 of 23

                                    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:  July 6, 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 MANAGEMENT IV, LLC


                      By:        /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

                      ICP MS MANAGEMENT, LLC


                      By:         /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

                      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 19 of 23

                      INTEGRAL CAPITAL PARTNERS IV, L.P.

                      By Integral Capital Management IV, LLC
                      Its General Partner


                      By:       /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

                      INTEGRAL CAPITAL PARTNERS IV MS SIDE FUND, L.P.

                      By ICP MS Management, LLC
                      Its General Partner


                      By:       /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

                      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 20 of 23


                                  EXHIBIT INDEX


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

Exhibit A:        Agreement of Joint Filing                            21

Exhibit F:        Managers of ICP MS Management, LLC                   23



<PAGE>



                                                                   Page 21 of 23


                                    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  July 6,  1998
containing the information required by Schedule 13D, for the 1,424,161 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,  Integral Capital
Partners International III, L.P., a Cayman Islands exempted limited partnership,
Integral Capital Partners IV, L.P., a Delaware limited  partnership and Integral
Capital Partners IV MS Side Fund, L.P., a Delaware limited partnership.

Date:  July 6, 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 MANAGEMENT IV, LLC

                       By:      /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

                       ICP MS MANAGEMENT, LLC

                       By:      /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

                       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


<PAGE>


                                                                   Page 22 of 23

                       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 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

                       INTEGRAL CAPITAL PARTNERS IV, L.P.

                       By Integral Capital Management IV, LLC
                       Its General Partner


                       By:      /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

                       INTEGRAL CAPITAL PARTNERS IV MS SIDE FUND, L.P.

                       By ICP MS Management, LLC
                       Its General Partner


                       By:      /s/ Pamela K. Hagenah
                         ---------------------------------
                                Pamela K. Hagenah
                                a Manager

<PAGE>


                                                                   Page 23 of 23

                                    EXHIBIT F

                                   Managers of
                             ICP MS Management, LLC

                  Set  forth  below,  with  respect  to each  manager  of ICP MS
Management, LLC, is the following: (a) name; (b) business address; (c) principal
occupation; and (d) citizenship.

1.       (a)      Roger B. McNamee
         (b)      c/o Integral Capital Partners
                  2750 Sand Hill Road,
                  Menlo Park, CA  94025
         (c)      General Partner of Integral Capital Management, L.P., Integral
                  Capital  Management II, L.P. and Integral  Capital  Management
                  III, L.P.,  Manager of Integral Capital Management IV, LLC and
                  Manager of ICP MS Management, LLC
         (d)      United States Citizen

2.       (a)      John A. Powell
         (b)      c/o Integral Capital Partners
                  2750 Sand Hill Road,
                  Menlo Park, CA  94025
         (c)      General Partner of Integral Capital Management, L.P., Integral
                  Capital  Management II, L.P. and Integral  Capital  Management
                  III, L.P.,  Manager of Integral Capital Management IV, LLC and
                  Manager of ICP MS Management, LLC
         (d)      United States Citizen

3.       (a)      Pamela K. Hagenah
         (b)      c/o Integral Capital Partners
                  2750 Sand Hill Road,
                  Menlo Park, CA  94025
         (c)      General  Partner of Integral  Capital  Management II, L.P. and
                  Integral  Capital  Management  III, L.P.,  Manager of Integral
                  Capital  Management  IV, LLC and Manager of ICP MS Management,
                  LLC
         (d)      United States Citizen



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