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SC 13G/A, 2000-02-16
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<PAGE>   1





                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

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


                            Allegiance Telecom, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

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

                                    01747T102
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                    12/31/99
- --------------------------------------------------------------------------------
             (Date of Event Which Required Filing of this Statement)

* 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 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).

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)
           ---





<PAGE>   2


- -------------------
CUSIP No. 01747T102                     13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Madison Dearborn Capital Partners II, L.P.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                   (a) [ ]
                                                                   (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        5,157,612 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        5,157,612 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           5,157,612 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           7.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*
                  PN
===============================================================================



                                  Page 2 of 45
<PAGE>   3



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

===============================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Madison Dearborn Partners II, L.P.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                    (a) [ ]
                                                                    (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        5,157,612 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        5,157,612  (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           5,157,612  (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                        [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           7.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================




                                  Page 3 of 45
<PAGE>   4



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Madison Dearborn Partners, Inc.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                      (a) [ ]
                                                                      (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        5,157,612 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        5,157,612 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           5,157,612 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                         [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           7.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           CO
================================================================================



                                  Page 4 of 45
<PAGE>   5



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Morgan Stanley Capital Partners III, L.P.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                      (a) [ ]
                                                                      (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        9,086,259 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        9,086,259 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           9,086,259 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                         [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           12.7% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================




                                  Page 5 of 45
<PAGE>   6



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           MSCP III, L.P.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                      (a) [ ]
                                                                      (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        10,302,247 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        10,302,247 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           10,302,247 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN; IA
================================================================================



                                Page of 6 of 45
<PAGE>   7



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Morgan Stanley Capital Partners III, Inc.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                      (a) [ ]
                                                                      (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        10,302,247 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        10,302,247 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           10,302,247 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                         [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           CO; IA
================================================================================




                                  Page 7 of 45
<PAGE>   8



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Morgan Stanley Dean Witter & Co.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                      (a) [ ]
                                                                      (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        10,302,247 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        10,302,247 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           10,302,247 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           CO; IA
================================================================================



                                  Page 8 of 45
<PAGE>   9



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Morgan Stanley Capital Investors, L.P.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        285,715 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        285,715 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           285,715 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .3% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================



                                  Page 9 of 45
<PAGE>   10



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           MSCP III 892 Investors, L.P.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                      (a) [ ]
                                                                      (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        930,273 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        930,273 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           930,273 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.3% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================



                                 Page 10 of 45
<PAGE>   11



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Battery Ventures IV, L.P.
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        157,178 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        157,178 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           157,178 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================



                                 Page 11 of 45
<PAGE>   12



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Battery Investment Partners IV, LLC
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                      (a) [ ]
                                                                      (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        23,713 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        23,713 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           23,713 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .03% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           LLC
================================================================================




                                 Page 12 of 45
<PAGE>   13



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Battery Partners IV, LLC
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                          180,891 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .25% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================




                                 Page 13 of 45
<PAGE>   14



- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Robert G. Barrett
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        180,891 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .25% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================




                                 Page 14 of 45
<PAGE>   15





- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Oliver D. Curme
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        180,891 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .25% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================




                                 Page 15 of 45
<PAGE>   16



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Richard D. Frisbie
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                          180,891 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                       -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .25% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================




                                 Page 16 of 45
<PAGE>   17


- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Thomas J. Crotty
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                        180,891 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .25% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 17 of 45
<PAGE>   18



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Kenneth P. Lawler
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                                       (a) [ ]
                                                                       (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

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

             BENEFICIALLY         6     SHARED VOTING POWER
               OWNED BY
                                           180,891 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           180,891 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                           [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .25% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================




                                 Page 18 of 45
<PAGE>   19



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Todd A. Dagres
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a) [ ]

                                                                 (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------

     NUMBER OF             5     SOLE VOTING POWER
      SHARES
                                 -0-
                           ----------------------------------------------------
   BENEFICIALLY            6     SHARED VOTING POWER
     OWNED BY
                                 180,891 (see Item 4 and Exhibit C)
                           ----------------------------------------------------
        EACH                7    SOLE DISPOSITIVE POWER
     REPORTING
                                 -0-
                           ----------------------------------------------------

       PERSON              8     SHARED DISPOSITIVE POWER
        WITH
                                 180,891 (see Item 4 and Exhibit C)

- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           180,891 (see Item 4 and Exhibit C)
- -------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                     [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           .25% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================




                                 Page 19 of 45
<PAGE>   20



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Frontenac VII Limited Partnership
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                              (a) [ ]

                                                              (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY


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

           Delaware
- --------------------------------------------------------------------------------

       NUMBER OF            5     SOLE VOTING POWER
        SHARES
                                  -0-
                            ---------------------------------------------------
      BENEFICIALLY          6     SHARED VOTING POWER
       OWNED BY
                                  779,861 (see Item 4 and Exhibit C)
                            ---------------------------------------------------
          EACH              7     SOLE DISPOSITIVE POWER
       REPORTING
                                  -0-
                            ---------------------------------------------------
         PERSON             8     SHARED DISPOSITIVE POWER
          WITH
                                  779,861 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           779,861 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                  [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================




                                 Page 20 of 45
<PAGE>   21


- -------------------
CUSIP No. 01747T102                      13G
- -------------------


- --------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Frontenac Masters VII Limited Partnership
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a) [ ]

                                                               (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

- --------------------------------------------------------------------------------
    4      CITIZENSHIP OR PLACE OF ORGANIZATION
           Delaware
- --------------------------------------------------------------------------------
         NUMBER OF               5     SOLE VOTING POWER
          SHARES
                                       -0-
                                 -----------------------------------------------
        BENEFICIALLY             6     SHARED VOTING POWER
         OWNED BY
                                       41,968 (see Item 4 and Exhibit C)
                                 -----------------------------------------------
            EACH                 7     SOLE DISPOSITIVE POWER
         REPORTING
                                        -0-
                                 -----------------------------------------------
           PERSON                8     SHARED DISPOSITIVE POWER
            WITH
                                        41,968 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           41,968 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                    [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
           .05% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*
           PN
================================================================================





                                 Page 21 of 45
<PAGE>   22




- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Frontenac Company VII, LLC
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           Delaware
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         -0-
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0-
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           LLC
================================================================================





                                 Page 22 of 45
<PAGE>   23


- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Paul D. Carbery
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         6,061
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY                        822,862 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         6,061
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         822,862 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           828,923 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================






                                 Page 23 of 45
<PAGE>   24


- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           James E. Cowie
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         8,676
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                           821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         8,676
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           830,505 (Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 24 of 45
<PAGE>   25


- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           James E. Crawford III
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         17,515 (see Item 4)
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         17,515 (see item 4)
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           842,480 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 25 of 45
<PAGE>   26


- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Rodney L. Goldstein
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         9,355
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         9,355
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           831,184 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================




                                 Page 26 of 45
<PAGE>   27



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Martin J. Koldyke
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         1,883
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         1,883
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           823,712 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 27 of 45
<PAGE>   28


- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Martin Laird Koldyke
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         5,698
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         5,698
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                        821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           827,527 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================




                                 Page 28 of 45
<PAGE>   29




- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Roger S. McEniry
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         8,676
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         8,676
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           830,505 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 29 of 45
<PAGE>   30


- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Laura P.Pearl
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a) [ ]

                                                             (b) [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         4,201
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         4,201
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           826,030 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 30 of 45
<PAGE>   31


- -------------------
CUSIP No. 01747T102                      13G
- -------------------


================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Jeremy H. Silverman
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                              (a)  [ ]

                                                              (b)  [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           UK
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         3,420
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         821,829 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         3,420
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         821,829 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           825,249 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           1.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 31 of 45
<PAGE>   32


- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Royce J. Holland
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a)  [ ]

                                                               (b)  [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         3,908,721 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         -0-
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         3,908,721 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         -0-
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           3,908,721 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           5.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 32 of 45
<PAGE>   33


- -------------------
CUSIP No. 01747T102                      13G
- -------------------

================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Thomas M. Lord
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a)  [ ]

                                                               (b)  [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         1,612,189 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         -0-
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         1,612,189 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         -0-
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,612,189 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           2.3% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 33 of 45
<PAGE>   34



- -------------------
CUSIP No. 01747T102                      13G
- -------------------


===============================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           C. Daniel Yost
- --------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a)  [ ]

                                                               (b)  [X]
- --------------------------------------------------------------------------------
    3      SEC USE ONLY

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

           USA
- --------------------------------------------------------------------------------
           NUMBER OF               5     SOLE VOTING POWER
            SHARES
                                         1,457,946
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         -0-
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         1,457,946
                                  ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         -0-
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,457,946
- --------------------------------------------------------------------------------

    10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                      [ ]
- --------------------------------------------------------------------------------
    11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           2.0% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================





                                 Page 34 of 45
<PAGE>   35


                         AMENDMENT NO. 1 TO SCHEDULE 13G

This Amendment No. 1 to Schedule 13G is being filed by those persons listed on
Exhibit B attached hereto (the "Reporting Persons"), in connection with the
shares of Common Stock, par value $.01 per share, of Allegiance Telecom, Inc.
(the "Company"). This Amendment No. 1 to Schedule 13G is being filed by the
Reporting Persons pursuant to the joint filing provisions of Rule 13d-1(k) of
the Securities Exchange Act of 1934, as amended (the "Act").

ITEM 1.  SECURITY AND ISSUER.

        (a)  Name of Issuer:

             Allegiance Telecom, Inc.

        (b)  Address of Issuer's Principal Executive Offices:
             1950 Stemmons Freeway
             Suite 3026
             Dallas, Texas 75207


ITEM 2.

        (a)  Name of Person Filing:

             See attached Exhibit B.

        (b)  Address of Principal Business Office:

             See attached Exhibit B.

        (c)  Citizenship:

             See attached Exhibit B.

        (d)  Title of Class of Securities:

             Common Stock, $.01 par value

        (e)  CUSIP Number:

             01747T102


ITEM 3.      IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(b), OR
             RULE 13d-2(b) or (c), CHECK WHETHER THE PERSON FILING IS A:
        (a)      [ ]    Broker or Dealer registered under Section 15 of 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 Adviser in accordance with
                         Section 240.13d-1(b)(1)(ii)(E)
        (f)      [ ]     Employee Benefit Plan or Endowment Fund in accordance
                         with Section 240.13d-1(b)(1)(ii)(F)



                                 Page 35 of 45
<PAGE>   36


        (g)      [ ]     Parent Holding Company or control person in accordance
                         with Section 240.13d-1(b)(1)(ii)(G)
        (h)      [ ]     Savings associations as defined in Section 3(b) of the
                         Federal Deposit Insurance Act
        (i)      [ ]     Church plan that is excluded from the definition of
                         an investment company under Section 3(c)(14) of the
                         Investment Company Act of 1940
        (j)      [ ]     Group, in accordance with
                         Section 230.13d-1(b)(1)(ii)(J)

         This Schedule is not being filed pursuant to Rule 13d-1(b) or Rule
13d-2(b) and therefore, none of the above are applicable.


ITEM 4.  OWNERSHIP.

Pursuant to Rule 13d-4 of the Act, the Reporting Persons expressly declare that
the filing of this statement shall not be construed as an admission that any
such person is, for the purposes of Section 13(d) and/or Section 13(g) of the
Act, the beneficial owner of any securities covered by this statement except to
the extent of such person's pecuniary interest in shares of Common Stock. See
also Exhibit C attached hereto, describing that certain Stock Purchase Agreement
dated as of August 13, 1997, among the Company, the Reporting Persons and
certain other parties.

All such ownership percentages of the securities reported herein are based upon
71,599,312 shares of Common Stock outstanding as of February 4, 2000.


Madison Dearborn Funds

         (a) Amount beneficially owned: Madison Dearborn Capital Partners II,
L.P. ("MDCP II") is the direct owner of 5,157,612 shares of Common Stock. MDCP
II is managed by its general partner, Madison Dearborn Partners II, L.P.
("MDP"). Dispositive and voting power of securities owned by MDCP II is shared
at MDP by an advisory committee of limited partners of MDP and by Madison
Dearborn Partners, Inc. ("MDP Inc"), the general partner of MDP. For purposes of
Rule 13d-3 of the Act, MDP Inc and MDP may be deemed to have shared voting and
dispositive power with respect to the 5,157,612 shares of Common Stock held by
MDCP II.

         (b) Percent of class: 7.2%

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

             sole power to vote or to direct the vote: -0-
             shared power to vote or to direct the vote: 5,157,612
             sole power to dispose or to direct the disposition of: -0-
             shared power to dispose or to direct the disposition of: 5,157,612




                                 Page 36 of 45
<PAGE>   37


Morgan Stanley Funds

         (a) Amount beneficially owned: Morgan Stanley Dean Witter & Co.
("Morgan Stanley Dean Witter") owns all of the outstanding shares of Morgan
Stanley Capital Partners III, Inc. ("MSCP Inc"), which is the general partner of
MSCP III, L.P. ("MSCP LP"), which is the general partner of Morgan Stanley
Capital Partners III, L.P. ("MSCP"). For purposes of Rule 13d-3 of the Act, the
Morgan Stanley Funds (as defined hereafter) may be deemed to beneficially own,
in the aggregate, 10,302,247 shares of Common Stock (MSCP: 9,086,259 shares;
MSCP III 892 Investors, L.P.: 930,273 shares; Morgan Stanley Capital Investors,
L.P.: 285,715 shares, such funds being referred to collectively as the "Morgan
Stanley Funds"). Each of Morgan Stanley Dean Witter, MSCP Inc and MSCP LP may be
deemed to have shared voting and dispositive power with respect to the
10,302,247 shares of Common Stock held by the Morgan Stanley Funds.

         (b) Percent of class: 14.4%

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

             sole power to vote or to direct the vote: -0- shared power to vote
             or to direct the vote: 10,302,247 sole power to dispose or to
             direct the disposition of: -0- shared power to dispose or to direct
             the disposition of: 10,302,247


Frontenac Funds

         (a) Amount beneficially owned: Frontenac VII Limited Partnership is the
direct owner of 779,861 shares of Common Stock and Frontenac Masters VII Limited
Partnership (together with Frontenac VII Limited Partnership, the "Frontenac
Funds") is the direct owner of 41,968 shares of Common Stock. For purposes of
Rule 13d-3 of the Act, Frontenac Company VII, LLC ("Frontenac LLC," which is the
general partner of each of the Frontenac Funds) may be deemed to have shared
voting and dispositive power with respect to the 821,829 shares held by the
Frontenac Funds. Mr. Carbery, Mr. Cowie, Mr. Crawford, Mr. Goldstein, Mr. M.J.
Koldyke, Mr. M.L. Koldyke, Mr. McEniry, Ms. Pearl and Mr. Silverman are members
of Frontenac LLC with the shared power to indirectly direct the voting of and
the disposition of the Common Stock held by the Frontenac Funds. Mr. Crawford
also beneficially owns 20,651 shares (17,515 shares held by Mr. Crawford
directly and 3,136 shares indirectly); Mr. Carbery also beneficially owns 7,094
shares (6,061 shares held by Mr. Carbery directly and 1,033 shares indirectly);
Mr. Cowie also beneficially owns 8,676 shares; Mr. Goldstein also beneficially
owns 9,355 shares; Mr. M.J. Koldyke also beneficially owns 1,883 shares; Mr. M.
Laird Koldyke also beneficially owns 5,698 shares; Mr. McEniry also beneficially
owns 8,676 shares; Ms. Pearl also beneficially owns 4,201 shares; and Mr.
Silverman also beneficially owns 3,420 shares.

         (b) Percent of class: 1.1%

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

             sole power to vote or to direct the vote: -0- (see above paragraph)
             shared power to vote or to direct the vote: 821,829 sole power to
             dispose or to direct the disposition of: -0- (see above paragraph)
             shared power to dispose or to direct the disposition of: 821,829





                                 Page 37 of 45
<PAGE>   38


Battery Funds

         (a) Amount beneficially owned: Battery Ventures IV, L.P. ("Battery IV")
is the direct owner of 157,178 shares of Common Stock and Battery Investment
Partners IV, LLC is the direct owner of 23,713 shares of Common Stock (together
with Battery IV, the "Battery Funds"). For purposes of Rule 13d-3 of the Act,
Battery Partners IV, LLC (which is the general partner of Battery IV) may be
deemed to have shared voting and dispositive power with respect to the shares
held by Battery IV and the Battery Funds may be deemed to beneficially own, in
the aggregate, 180,891 shares of Common Stock. Mr. Barrett, Mr. Curme, Mr.
Frisbie, Mr. Crotty, Mr. Lawler and Mr. Dagres are the member managers of
Battery Partners IV, LLC and are member managers of Battery Investment Partners
IV, LLC, with the shared power to indirectly direct the voting of and the
disposition of the Common Stock held by the Battery Funds.

         (b) Percent of class: .25%

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

             sole power to vote or to direct the vote: -0-
             shared power to vote or to direct the vote: 180,891
             sole power to dispose or to direct the disposition of: -0-
             shared power to dispose or to direct the disposition of: 180,891

Royce J. Holland

         (a) Amount beneficially owned: 3,908,721 (1,964,569 shares held by
Royce J. Holland directly, 1,940,552 shares held by the Royce J. Holland Family
Limited Partnership, of which Mr. Holland is the sole general partner, 1,000
shares held by Mr. Holland's wife and 2,600 shares held by Mr. Holland as
custodian for his children under the Uniform Gifts to Minors Act).

         (b) Percent of class: 5.5%

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

             sole power to vote or to direct the vote: 3,908,721
             shared power to vote or to direct the vote: -0-
             sole power to dispose or to direct the disposition of: 3,908,721
             shared power to dispose or to direct the disposition of: -0-

Thomas M. Lord

         (a) Amount beneficially owned: 1,612,189 (806,094 shares held by
             Thomas M. Lord directly, and an aggregate of 806,095 shares held by
             Mr. Lord's spouse and children)

         (b) Percent of class: 2.3%

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

             sole power to vote or to direct the vote: 1,612,189
             shared power to vote or to direct the vote: -0-
             sole power to dispose or to direct the disposition of: 1,612,189
             shared power to dispose or to direct the disposition of: -0-




                                 Page 38 of 45
<PAGE>   39


C. Daniel Yost

         (a) Amount beneficially owned: 1,457,946

         (b) Percent of class: 2.0%

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

             sole power to vote or to direct the vote: 1,457,946
             shared power to vote or to direct the vote: -0-
             sole power to dispose or to direct the disposition of: 1,457,946
             shared power to dispose or to direct the disposition of: -0-


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.
             See Item 4 above.


ITEM 8.      IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
             See Exhibit C attached hereto.

ITEM 9.      NOTICE OF DISSOLUTION OF GROUP.
             Not applicable.


ITEM 10.     CERTIFICATION.
             Not applicable.




                                 Page 39 of 45
<PAGE>   40

                                    EXHIBITS


EXHIBIT A       Joint Filing Agreement

EXHIBIT B       Name Of Person Filing; Address Of Principal Business Office;
                Citizenship

EXHIBIT C       Voting Agreement



                                    SIGNATURE


                After reasonable inquiry and to the best of the undersigned's
knowledge and belief, the undersigned certifies that the information set forth
in this statement is true, complete and correct.

Dated:      February 15, 2000


MADISON DEARBORN CAPITAL PARTNERS II, L.P.
By: Madison Dearborn Partners II, L.P., its general partner
By: Madison Dearborn Partners, Inc., its general partner

By:
- -------------------------------------
Its:         Managing Director
    ------------------------------------


MADISON DEARBORN PARTNERS II, L.P.

By: Madison Dearborn Partners, Inc., its general partner

By:
- -------------------------------------
Its:         Managing Director
    ------------------------------------


MADISON DEARBORN PARTNERS, INC.

By:
- -------------------------------------
Its:         Managing Director
    ------------------------------------





                                 Page 40 of 45
<PAGE>   41


                                    SIGNATURE

         After reasonable inquiry and to the best of the undersigned's knowledge
and belief, the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:  February 15, 2000

MORGAN STANLEY CAPITAL PARTNERS  III, L.P.
By: MSCP III, L.P., its general partner
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
   -------------------------------------
Its:    Secretary
    ------------------------------------

MSCP III, L.P.
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
- -------------------------------------
Its:    Secretary
    ------------------------------------

MORGAN STANLEY CAPITAL PARTNERS III, INC.

By:
- -------------------------------------
Its:    Secretary
    ------------------------------------

MORGAN STANLEY CAPITAL INVESTORS, L.P.
By: MSCP III, L.P., its general partner
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
- -------------------------------------
Its:    Secretary
    ------------------------------------

MSCP III 892 INVESTORS, L.P.
By: MSCP III, L.P., its general partner
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
- -------------------------------------
Its:    Secretary
    ------------------------------------

MORGAN STANLEY DEAN WITTER, DISCOVER & CO.

By:
- -------------------------------------
Its:    Authorized Signatory
    ------------------------------------




                                 Page 41 of 45
<PAGE>   42


                                    SIGNATURE


         After reasonable inquiry and to the best of the undersigned's knowledge
and belief, the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:   February 15, 2000


FRONTENAC VII LIMITED PARTNERSHIP
By: Frontenac Company VII, LLC, its general partner

By: /s/ Karen C. Fanelli
   -------------------------------------
Karen C. Fanelli, Under Power of Attorney (previously filed)


FRONTENAC MASTERS VII LIMITED PARTNERSHIP
By: Frontenac Company VII, LLC, its general partner

By: /s/ Karen C. Fanelli
   -------------------------------------
Karen C. Fanelli, Under Power of Attorney (previously filed)


FRONTENAC COMPANY VII, LLC

By: /s/ Karen C. Fanelli
   -------------------------------------
Karen C. Fanelli, Under Power of Attorney (previously filed)

   /s/ Karen C. Fanelli
- ----------------------------------------
Karen C. Fanelli, under Power of Attorney (previously filed) for:
         Paul D. Carbery
         James E. Cowie
         James E. Crawford III
         Rodney L. Goldstein
         Martin J. Koldyke
         Martin Laird Koldyke
         Roger S. McEniry
         Laura P. Pearl
         Jeremy H. Silverman






                                 Page 42 of 45
<PAGE>   43





                                    SIGNATURE


         After reasonable inquiry and to the best of the undersigned's knowledge
and belief, the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:   February 15, 2000


BATTERY VENTURES IV, L.P.
By:  Battery Partners IV, LLC, its general partner

By: /s/ RICHARD D. FRISBIE
   -------------------------------------
Its: Member Manager
    ------------------------------------


BATTERY INVESTMENT PARTNERS IV, LLC

By: /s/ RICHARD D. FRISBIE
   -------------------------------------
Its: Member Manager
    ------------------------------------


BATTERY PARTNERS IV, L.P.

By: /s/ RICHARD D. FRISBIE
   -------------------------------------
Its: Member Manager
    ------------------------------------



 /s/ RICHARD D. FRISBIE
- ------------------------------------
Richard D. Frisbie, individually and under Power of Attorney for:
         Robert G. Barrett
         Oliver D. Curme
         Thomas J. Crotty
         Kenneth P. Lawler
         Todd A. Dagres







                                 Page 43 of 45
<PAGE>   44


                                    SIGNATURE


         After reasonable inquiry and to the best of the undersigned's knowledge
and belief, the undersigned certifies that the information set forth in this
statement is true, complete and correct.

Dated:   February 15, 2000



ROYCE J. HOLLAND FAMILY LIMITED PARTNERSHIP

By: /s/ Royce J. Holland
   -------------------------------------
Its: Sole General Partner


/s/ Royce J. Holland
- ----------------------------------------
ROYCE J. HOLLAND


/s/ Thomas M. Lord
- ----------------------------------------
THOMAS M. LORD


/s/ C. Daniel Yost
- ----------------------------------------
C. DANIEL YOST









                                 Page 44 of 45
<PAGE>   45





                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
EXHIBIT
NUMBER         DESCRIPTION
- -------        -----------
<S>            <C>
 A             Joint Filing Agreement

 B             Name Of Person Filing; Address Of Principal Business Office;
                  Citizenship

 C             Voting Agreement
</TABLE>



                                 Page 45 of 45

<PAGE>   1


                                                                       EXHIBIT A


                             JOINT FILING AGREEMENT


         The undersigned and each other person executing this joint filing
agreement (this "Filing Agreement") agree as follows:

         The undersigned and each other person executing this Filing Agreement
are individually eligible to use the Schedule 13G to which this Exhibit is
attached and such Schedule 13G is filed on behalf of the undersigned and each
other person executing this Filing Agreement.

         The undersigned and each other person executing this Filing Agreement
are responsible for the timely filing of such Schedule 13G and any amendments
thereto, and for the completeness and accuracy of the information concerning
such person contained therein; but none of the undersigned or any other person
executing this Filing Agreement is responsible for the completeness or accuracy
of the information statement concerning any other persons making the filing,
unless such person knows or has reason to believe that such information is
inaccurate.

         This Filing Agreement may be executed in two or more counterparts, each
of which will be deemed an original, but all of which together shall constitute
one and the same instrument.

Dated: February 15, 2000


MADISON DEARBORN CAPITAL PARTNERS II, L.P.
By: Madison Dearborn Partners II, L.P., its general partner
By: Madison Dearborn Partners, Inc., its general partner

By:
- --------------------------------
Its:    Managing Director
    -------------------------------


MADISON DEARBORN PARTNERS II, L.P.

By: Madison Dearborn Partners, Inc., its general partner

By:
- --------------------------------
Its:    Managing Director
    -------------------------------


MADISON DEARBORN PARTNERS, INC.

By: /s/ Paul J. Finnegan
   --------------------------------
Its:    Managing Director
    -------------------------------





<PAGE>   2



MORGAN STANLEY CAPITAL PARTNERS  III, L.P.
By: MSCP III, L.P., its general partner
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
 --------------------------------
Its: Secretary
    -------------------------------


MSCP III, L.P.
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
- --------------------------------
Its: Secretary
    -------------------------------


MORGAN STANLEY CAPITAL PARTNERS III, INC.

By:
- --------------------------------
Its: Secretary
    -------------------------------


MORGAN STANLEY CAPITAL INVESTORS, L.P.
By: MSCP III, L.P., its general partner
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
- --------------------------------
Its: Secretary
    -------------------------------


MSCP III 892 INVESTORS, L.P.
By: MSCP III, L.P., its general partner
By: Morgan Stanley Capital Partners III, Inc., its general partner
By:
- --------------------------------
Its: Secretary
    -------------------------------


MORGAN STANLEY DEAN WITTER, DISCOVER & CO.

By:
- --------------------------------
Its: Authorized Signatory
    -------------------------------





<PAGE>   3



FRONTENAC VII LIMITED PARTNERSHIP
By: Frontenac Company VII, LLC, its general partner

By: /s/ Karen C. Fanelli
   --------------------------------
Karen C. Fanelli, Under Power of Attorney (previously filed and incorporated
herein by reference)


FRONTENAC MASTERS VII LIMITED PARTNERSHIP
By: Frontenac Company VII, LLC, its general partner

By: /s/ Karen C. Fanelli
   --------------------------------
Karen C. Fanelli, Under Power of Attorney (previously filed and incorporated
herein by reference)


FRONTENAC COMPANY VII, LLC

By: /s/ Karen C. Fanelli
   --------------------------------
Karen C. Fanelli, Under Power of Attorney (previously filed and incorporated
herein by reference)


/s/ Karen C. Fanelli
   --------------------------------
Karen C. Fanelli, under Power of Attorney (previously filed and incorporated
herein by reference) for:
         Paul D. Carbery
         James E. Cowie
         James E. Crawford III
         Rodney L. Goldstein
         Martin J. Koldyke
         Martin Laird Koldyke
         Roger S. McEniry
         Laura P. Pearl
         Jeremy H. Silverman





<PAGE>   4



BATTERY VENTURES IV, L.P.
By:  Battery Partners IV, LLC, its general partner

By: /s/ RICHARD D. FRISBIE
   --------------------------------
Its: Member Manager
    -------------------------------


BATTERY INVESTMENT PARTNERS IV, LLC

By: /s/ RICHARD D. FRISBIE
   --------------------------------
Its: Member Manager
    -------------------------------


BATTERY PARTNERS IV, LLC

By: /s/ RICHARD D. FRISBIE
   --------------------------------
Its: Member Manager
    -------------------------------

/s/ RICHARD D. FRISBIE
- ----------------------------
Richard D. Frisbie, individually and under Power of Attorney (previously filed
and incorporated herein by reference) for:
         Robert G. Barrett
         Oliver D. Curme
         Thomas J. Crotty
         Kenneth P. Lawler
         Todd A. Dagres





<PAGE>   5





/s/ Royce J. Holland
- -----------------------------------
ROYCE J. HOLLAND


/s/ Thomas M. Lord
- -----------------------------------
THOMAS M. LORD


/s/ C. Daniel Yost
- -----------------------------------
C. DANIEL YOST




<PAGE>   1
                                                                       EXHIBIT B

    NAME OF PERSON FILING; ADDRESS OF PRINCIPAL BUSINESS OFFICE; CITIZENSHIP.

Madison Dearborn Capital Partners II, L.P., a Delaware limited partnership
Madison Dearborn Partners II, L.P., a Delaware limited partnership
Madison Dearborn Partners, Inc., a Delaware corporation
Three First National Plaza
Suite 3800
Chicago, IL 60602

Morgan Stanley Capital Partners III, L.P., a Delaware limited partnership MSCP
III, L.P., a Delaware limited partnership
Morgan Stanley Capital Partners III, Inc., a Delaware corporation
Morgan Stanley Capital Investors, L.P., a Delaware limited partnership
MSCP III 892 Investors, L.P., a Delaware limited partnership
1221 Avenue of the Americas
33rd Floor
New York, NY 10020

Morgan Stanley Dean Witter & Co., a Delaware corporation
1585 Broadway
New York, NY 10036

Frontenac VII Limited Partnership, a Delaware limited partnership
Frontenac Masters VII Limited Partners, a Delaware limited partnership
Frontenac Company VII, LLC, a Delaware limited liability company
Paul D. Carbery, citizen of the United States
James E. Cowie, citizen of the United States
James E. Crawford  III, citizen of the United States
Rodney L. Goldstein, citizen of the United States
Martin J. Koldyke, citizen of the United States
Martin Laird Koldyke, citizen of the United States
Roger S. McEniry, citizen of the United States
Laura P. Pearl, citizen of the United States
Jeremy H. Silverman, citizen of the United Kingdom
135 S. LaSalle Street,
Suite 3800
Chicago, IL 60603

Battery Ventures IV, L.P., a Delaware limited partnership
Battery Investment Partners IV, LLC, a Delaware limited liability company
Battery Partners IV, LLC, a Delaware limited liability company
Robert G. Barrett, citizen of the United States
Richard D. Frisbie, citizen of the United States
Oliver D. Curme, citizen of the United States
Thomas J. Crotty, citizen of the United States
Kenneth P. Lawler, citizen of the United States
Todd A. Dagres, citizen of the United States
20 William Street
Wellesley, MA 02181

Royce J. Holland, citizen of the United States
c/o Allegiance Telecom, Inc.
1950 Stemmons Freeway
Suite 3026
Dallas, TX 75207

Thomas M. Lord, citizen of the United States
c/o Allegiance Telecom, Inc.
3500 Piedmont Rd, Suite 340
Atlanta, GA 30305

C. Daniel Yost, citizen of the United States
c/o Allegiance Telecom, Inc.
1950 Stemmons Freeway
Suite 3026
Dallas, TX 75207


<PAGE>   1
                                                                      EXHIBIT C
                                VOTING AGREEMENT

            The Company, MDCP II, the Morgan Stanley Funds, the Frontenac Funds,
the Battery Funds, Royce J. Holland, Thomas M. Lord, C. Daniel Yost and certain
others are party to that certain Stock Purchase Agreement dated as of August 13,
1997 (the "Agreement"). As a result of certain provisions of the Agreement, the
parties to such Agreement may be deemed to be a "group" for purposes of Section
13(d)(3) of the Act and Rule 13d-5(b)(1) thereunder and the beneficial owner in
the aggregate of more than five percent (5%) of the outstanding Common Stock.

            NOTWITHSTANDING THE FOREGOING, EACH REPORTING PERSON EXPRESSLY
DECLARES THAT THE FILING OF THIS SCHEDULE SHALL NOT BE CONSTRUED AS AN ADMISSION
THAT ANY SUCH REPORTING PERSON IS, FOR PURPOSES OF SECTION 13(d) AND/OR SECTION
13(g) OF THE ACT, THE BENEFICIAL OWNER OF ANY SECURITIES COVERED BY THIS
SCHEDULE OTHER THAN THOSE SHARES OF COMMON STOCK IN WHICH SUCH REPORTING PERSON
HAS A PECUNIARY INTEREST. EACH REPORTING PERSON EXPRESSLY DISCLAIMS THAT THEY
HAVE AGREED TO ACT AS A GROUP OTHER THAN AS DESCRIBED IN THIS SCHEDULE.

            The parties to the Agreement have agreed to vote all of their shares
in such a manner as to elect the following persons to the Company's board of
directors: (i) two designees of each of MDCP II, the Morgan Stanley Funds and
the Frontenac Funds, (ii) one designee of the Battery Funds, (iii) the Company's
Chief Executive Officer, (iv) three members of the Company's management
designated by the management investors and (v) two non-employee directors
designated by the fund investors and reasonably acceptable to the management
investors.

            In the event MDCP II's beneficial ownership of Common Stock is less
than 30% but equal to or greater than 15% of its original investment, it will be
entitled to designate one director instead of two; in the event MDCP II's
beneficial ownership of Common Stock is less than 15% of its original
investment, it will not have a right to designate a director to the board. In
the event the Morgan Stanley Funds' beneficial ownership of Common Stock is less
than 30% but equal to or greater than 15% of their original investment, they
will be entitled to designate one director instead of two; in the event the
Morgan Stanley Funds' beneficial ownership of Common Stock is less than 15% of
their original investment, they will not have a right to designate a director to
the board. In the event the Frontenac Funds' beneficial ownership of Common
Stock is less than 66 2/3% but equal to or greater than 33 1/3% of their
original investment, they will be entitled to designate one director instead of
two; in the event the Frontenac Funds' beneficial ownership of Common Stock is
less than 33 1/3% of their original investment, they will not have a right to
designate a director to the board. In the event the Battery Funds' beneficial
ownership of Common Stock is less than 50% of their original investment, they
will not have a right to designate a director to the board. Under the Agreement,
the composition of the board of directors of each of the Company's subsidiaries
shall be the same as that of the board of directors of the Company.

            Except as set forth above, the Agreement does not extend to voting
upon other questions or matters on which shareholders will have the right to
vote under the Company's charter, bylaws or the laws of the State of Delaware.
The above described voting provisions terminate upon a closing of a Sale of the
Company (as defined in the Agreement), unless these provisions are extended in
accordance with the Agreement.



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