COLLATOS WILLIAM P
SC 13G, 2000-02-15
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934

                             (Amendment No. _____)*


                                  ITXC Corp.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

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

                                   45069F109
                        ------------------------------
                                 (CUSIP Number)

                               Decemeber 31,1999
- --------------------------------------------------------------------------------
            (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [_] Rule 13d-1(b)

     [_] Rule 13d-1(c)

     [X] Rule 13d-1(d)


*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 the
disclosures provided in a prior cover page.

The information required in 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).

                               Page 1 of 14 pages
<PAGE>

- ----------------------------                         -------------------------
  CUSIP NO.  45069F109                13G                  Page 2 of 14
- ----------------------------                         -------------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Spectrum Equity Investors II, L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            -0-

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          4,649,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             -0-

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          4,649,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
      4,649,000
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10    (SEE INSTRUCTIONS)
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
      12.994%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
      PN

- ------------------------------------------------------------------------------

     Act but shall be subject to all other provisions of the Act (however, see
the Notes).

SEC 1745 (3-98)

                               Page 2 of 14 pages
<PAGE>

- ----------------------------                         -------------------------
  CUSIP NO.  45069F109                13G                  Page 3 of 14
- ----------------------------                         -------------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Spectrum Equity Associates II, L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            -0-

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          4,649,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             -0-

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          4,649,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
      4,649,000
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10    (SEE INSTRUCTIONS)
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
      12.994%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
      PN

- ------------------------------------------------------------------------------

                               Page 3 of 14 pages
<PAGE>

- ----------------------------                         -------------------------
  CUSIP NO.  45069F109                13G                  Page 4 of 14
- ----------------------------                         -------------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Brion B. Applegate

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            -0-

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          4,649,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             -0-

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          4,649,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
      4,649,000
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10    (SEE INSTRUCTIONS)
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
      12.994%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
      IN

- ------------------------------------------------------------------------------

                               Page 4 of 14 pages
<PAGE>

- ----------------------------                         -------------------------
  CUSIP NO.  45069F109                13G                  Page 5 of 14
- ----------------------------                         -------------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      William P. Collatos

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            -0-

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          4,649,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             -0-

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          4,649,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
      4,649,000
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10    (SEE INSTRUCTIONS)
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
      12.994%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
      IN

- ------------------------------------------------------------------------------

                               Page 5 of 14 pages
<PAGE>

- ----------------------------                         -------------------------
  CUSIP NO.  45069F109                13G                  Page 6 of 14
- ----------------------------                         -------------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Kevin J. Maroni

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      United States

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            -0-

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          4,649,000
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             -0-

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          4,649,000
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
      4,649,000
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
10    (SEE INSTRUCTIONS)
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11
      12.994%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
12
      IN

- ------------------------------------------------------------------------------

                               Page 6 of 14 pages
<PAGE>

- ----------------------------                         -------------------------
  CUSIP NO.  45069F109                13G                  Page 7 of 14
- ----------------------------                         -------------------------


                                  Schedule 13G
                                  ------------


Item 1(a).  Name of Issuer:  ITXC Corp. (the "Issuer").
            --------------

Item 1(b).  Address of Issuer's Principal Executive Offices:  600 College Road
            ------------------------------------------------
            East, Princeton, New Jersey 08540

Item 2(a).  Names of Persons Filing: Spectrum Equity Investors II, L.P. ("SEI II
            -----------------------
            LP"), and Spectrum Equity Associates II, L.P. ("SEA II LP"), which
            is the sole general partner of SEI II LP, and Messrs. Brion B.
            Applegate, William P. Collatos and Kevin J. Maroni (the "General
            Partners II"), each of whom is a general partner of SEA II LP. The
            persons named in this paragraph are sometimes referred to herein
            individually as a "Reporting Person" and collectively as the
            "Reporting Persons".)

Item 2(b).  Address of Principal Business Office or, if None, Residence:  The
            -----------------------------------------------------------
            principal business office of SEI II LP, SEA II LP, SEI 1998, and
            William P. Collatos and Kevin J. Maroni is One International Place,
            29/th/ Floor, Boston, Massachusetts, 02110. The principal business
            office of Brion B. Applegate is 333 Middlefield Road, Suite 200,
            Menlo Park, California, 94025.

Item 2(c).  Citizenship:  Each of SEI II LP and SEA II LP are limited
            -----------
            partnerships formed under the laws of the State of Delaware. Each of
            the General Partners is a United States citizen.

Item 2(d).  Title of Class of Securities: Common Stock, $.01 par value per
            ----------------------------
            share.

Item 2(e).  CUSIP Number:  45069F109
            -------------

Item 3.     If this statement if filed pursuant to Rules 13d-1(b), or 13d-2(b),
            -------------------------------------------------------------------
            check whether the person filing is a:
            ------------------------------------

            (a) [  ]  Broker or Dealer registered under Section 15 of the
                      Securities Exchange Act of 1934 (the "Act").

            (b) [  ]  Bank as defined in Section 3(a)(6) of the Act.

            (c) [  ]  Insurance Company as defined in Section 3(a)(19) of the
                      Act.

            (d) [  ]  Investment Company registered under Section 8 of the
                      Investment Company Act of 1940.

            (e) [  ]  Investment Advisor registered under Section 203 of the
                      Investment Advisers Act of 1940.

            (f) [  ]  Employee Benefit Plan, Pension Fund which is subject to
                      the provisions of the Employee Retirement Income Security
                      Act of 1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(f)
                      of the Act.

            (g) [  ]  Parent Holding Company, in accordance with Rule 13d-
                      1(b)(ii)(G) of the Act.

            (h) [  ]  Group, in accordance with Rule 13d-1(b)(1)(ii)(H) of the
                      Act.

           Not Applicable.

Item 4.    Ownership.
           ---------

                               Page 7 of 14 pages
<PAGE>

- ----------------------------                         -------------------------
  CUSIP NO.  45069F109                13G                  Page 8 of 14
- ----------------------------                         -------------------------


          (a)  Amount Beneficially Owned: SEI II LP holds of record 4,649,000
               shares of Common Stock of the Issuer (the "Record Shares").  SEA
               II LP, as the sole general partner of SEI II LP, may be deemed to
               beneficially own all of the Record Shares.  Each General Partner,
               as a general partner of SEA II LP, may be deemed to beneficially
               own all of the Record Shares.

          (b)  Percent of Class:  12.994% for each Reporting Person (based on
               the 35,777,366 shares of Common Stock reported to be outstanding
               on September 30, 1999 in the Issuer's 10Q and including for
               purposes of calculation of beneficial ownership the securities of
               the Issuer held by the SEI II LP and SEI 1998).

          (c)  Number of shares as to which such person has:

               (i)    sole power to vote or to direct the vote:  no shares

               (ii)   shared power to vote or to direct the vote:  4,649,000
                      shares

               (iii)  sole power to dispose or direct the disposition of: no
                      shares

               (iv)   shared power to dispose or direct the disposition of:
                      4,649,000 shares

          Each Reporting Person expressly disclaims beneficial ownership of any
securities of the Issuer not held of record by such Reporting Person.

Item 5.   Ownership of Five Percent or Less of a Class.
          --------------------------------------------

          Not Applicable.

Item 6.   Ownership of More than Five Percent on Behalf of Another Person.
          ---------------------------------------------------------------

          Not Applicable.

Item 7.   Identification and Classification of the Subsidiary which Acquired the
          ----------------------------------------------------------------------
          Security Being Reported on By the Parent Holding Company.
          --------------------------------------------------------

          Not Applicable.

Item 8.   Identification and Classification of Members of the Group.
          ---------------------------------------------------------

          Not Applicable.

Item 9.   Notice of Dissolution of Group.
          ------------------------------

          Not Applicable.

Item 10.  Certification.
          -------------

          Not Applicable.  This statement on Schedule 13G is not filed pursuant
          to Rule 13d-1(b).

                               Page 8 of 14 pages
<PAGE>

- -----------------------                                  --------------------
CUSIP No. 45069F109                 13G                     Page 9 of 14
- -----------------------                                  --------------------


                                   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.


Date: February __, 2000


                                        SPECTRUM EQUITY INVESTORS II, L.P.

                                        By: Spectrum Equity Associates II, L.P.
                                            Its Sole General Partner

                                            By:______________________________
                                               General Partner

                              Page 9 of 14 pages
<PAGE>

- -----------------------                                  --------------------
CUSIP No. 45069F109                 13G                     Page 10 of 14
- -----------------------                                  --------------------


                                   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.


Date: February __, 2000


                                        SPECTRUM EQUITY INVESTORS II, L.P.

                                        By: ___________________________
                                            General Partner

                              Page 10 of 14 pages
<PAGE>

- -----------------------                                  --------------------
CUSIP No. 45069F109                 13G                     Page 11 of 14
- -----------------------                                  --------------------


                                   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.


Date: February __, 2000

                                           ______________________________
                                           Brion B. Applegate

                              Page 11 of 14 pages
<PAGE>

- -----------------------                                  --------------------
CUSIP No. 45069F109                 13G                     Page 12 of 14
- -----------------------                                  --------------------


                                   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.


Date: February __, 2000

                                           ______________________________
                                           William P. Collatos

                              Page 12 of 14 pages
<PAGE>

- -----------------------                                  --------------------
CUSIP No. 45069F109                 13G                     Page 13 of 14
- -----------------------                                  --------------------


                                   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.


Date: February 14, 2000


                                           /s/ Kevin J. Maroni
                                           ---------------------------------
                                           Kevin J. Maroni

                              Page 13 of 14 pages
<PAGE>

- -----------------------                                  --------------------
CUSIP No. 45069F109                 13G                     Page 14 of 14
- -----------------------                                  --------------------

                                                                       Exhibit 1
                                                                       ---------

                                   AGREEMENT
                                   ---------

  Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, the
undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the beneficial ownership
by each of the undersigned

Executed this 14th day of February 2000.


                                        SPECTRUM EQUITY INVESTORS II,L.P.

                                        By: Spectrum Equity Associates, II L.P.
                                            Its Sole General Partner

                                            By: /s/ William P. Collatos
                                                ----------------------------
                                                General Partner

                                        SPECTRUM EQUITY ASSOCIATES II, L.P.

                                        By: /s/ William P. Collatos
                                            --------------------------------
                                            General Partner

                                        /s/ Brion B. Applegate
                                        ------------------------------------
                                        Brion B. Applegate


                                        /s/ William P. Collatos
                                        ------------------------------------
                                        William P. Collatos


                                        /s/ Kevin J. Maroni
                                        ------------------------------------
                                        Kevin J. Maroni


                              Page 14 of 14 pages



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