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SC 13G, 1999-02-16
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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. ________)*


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

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

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

* 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 1 of 48 Pages

<PAGE>   2

- -------------------                                                 ------------
CUSIP No. 01747T102                     13G                         Page 2 of 48
- -------------------                                                 ------------

<TABLE>
<S>        <C>                                                     <C>
================================================================================
    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
                                        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)

           20.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>


<PAGE>   3

- -------------------                                                ------------
CUSIP No. 01747T102                     13G                        Page 3 of 48
- -------------------                                                ------------

<TABLE>
<S>        <C>                               <C>   <C>                         
===============================================================================
    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
                                        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)

           20.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>



<PAGE>   4

- -------------------                                                 ------------
CUSIP No. 01747T102                     13G                         Page 4 of 48
- -------------------                                                 ------------

<TABLE>
<S>        <C>                               <C>   <C>                         
================================================================================
    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
                                        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)

           20.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           CO
================================================================================
</TABLE>



<PAGE>   5

- -------------------                                                 ------------
CUSIP No. 01747T102                     13G                         Page 5 of 48
- -------------------                                                 ------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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)

           18.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>



<PAGE>   6

- -------------------                                                 ------------
CUSIP No. 01747T102                     13G                         Page 6 of 48

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

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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)

           20.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN; IA
================================================================================
</TABLE>



<PAGE>   7

- -------------------                                                 ------------
CUSIP No. 01747T102                     13G                         Page 7 of 48
- -------------------                                                 ------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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)

           20.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           CO; IA
================================================================================
</TABLE>



<PAGE>   8

- -------------------                                                 ------------
CUSIP No. 01747T102                     13G                         Page 8 of 48
- -------------------                                                 ------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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)

           20.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           CO; IA
================================================================================
</TABLE>



<PAGE>   9

- -------------------                                                 ------------
CUSIP No. 01747T102                     13G                         Page 9 of 48
- -------------------                                                 ------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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)

           .5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>



<PAGE>   10

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 10 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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)

           1.8% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>



<PAGE>   11

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 11 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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
                                        2,099,527 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        2,099,527 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,099,527 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>



<PAGE>   12

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 12 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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
                                        31,972 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        31,972 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           31,972 (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)

           .06% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           LLC
================================================================================
</TABLE>



<PAGE>   13

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 13 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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
                                        2,099,527 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING
                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH
                                        2,099,527 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,099,527 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>



<PAGE>   14

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 14 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>                          
================================================================================
    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

                                        2,131,449 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING

                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH

                                        2,131,449 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,131,449 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>



<PAGE>   15

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 15 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>                         
================================================================================
    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

                                        2,131,449 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING

                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH

                                        2,131,449 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,131,449 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>



<PAGE>   16

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 16 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>
================================================================================
    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

                                        2,131,449 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING

                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH

                                        2,131,449 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,131,449 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>



<PAGE>   17

- -------------------                                                -------------
CUSIP No. 01747T102                     13G                        Page 17 of 48
- -------------------                                                -------------

<TABLE>
<S>        <C>                               <C>   <C>
================================================================================
    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

                                        2,131,449 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING

                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH

                                        2,131,449 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,131,449 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>



<PAGE>   18
- -------------------                                               -------------
CUSIP No. 01747T102                     13G                       Page 18 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                               <C>   <C>
================================================================================
    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

                                        2,131,449 (see Item 4 and Exhibit C)
                                  ----------------------------------------------
                 EACH             7     SOLE DISPOSITIVE POWER
               REPORTING

                                        -0-
                                  ----------------------------------------------

                PERSON            8     SHARED DISPOSITIVE POWER
                 WITH

                                        2,131,449 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,131,449 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>
<PAGE>   19
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 19 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                       <C>
================================================================================
    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
                                 2,131,449 (see Item 4 and Exhibit C)
                           ----------------------------------------------------
        EACH                7    SOLE DISPOSITIVE POWER
     REPORTING
                                 -0-
                           ----------------------------------------------------

       PERSON              8     SHARED DISPOSITIVE POWER
        WITH
                                 2,131,449 (see Item 4 and Exhibit C)

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

           2,131,449 (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)

           4.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>



<PAGE>   20
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 20 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                  4,059,999 (see Item 4 and Exhibit C)
                            ---------------------------------------------------
          EACH              7     SOLE DISPOSITIVE POWER
       REPORTING
                                  -0-
                            ---------------------------------------------------
         PERSON             8     SHARED DISPOSITIVE POWER
          WITH
                                  4,059,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------

    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,059,999 (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)

           8.1% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>

                     * SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   21
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 21 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
- --------------------------------------------------------------------------------
    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                      
                                       203,000 (see Item 4 and Exhibit C)
                                 -----------------------------------------------
            EACH                 7     SOLE DISPOSITIVE POWER
         REPORTING
                                        -0-
                                 -----------------------------------------------
           PERSON                8     SHARED DISPOSITIVE POWER
            WITH
                                        203,000 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           203,000 (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)
           .4% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*
           PN
================================================================================
</TABLE>



<PAGE>   22
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 22 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0-
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           LLC
================================================================================
</TABLE>


<PAGE>   23
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 23 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0-
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0-
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   24
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 24 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0-
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0-
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   25
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 25 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         10,900 (see Item 4)
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         10,900 (see item 4)
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,273,899 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   26
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 26 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0- 
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0- 
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   27
- -------------------                                               ------------- 
CUSIP NO. 01747T102                 13G                           Page 27 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0- 
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0- 
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>
<PAGE>   28
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 28 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0- 
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0-
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   29
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 29 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0- 
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0- 
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   30
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 30 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0- 
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0- 
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   31
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 31 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         -0- 
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         4,262,999 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0- 
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         4,262,999 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           4,262,999 (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)

           8.5% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   32
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 32 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           Royce J. Holland Family 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
                                         1,940,552 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         -0- 
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         1,940,552 (see Item 4 and Exhibit C)
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,940,552 (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)

           3.9% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           PN
================================================================================
</TABLE>

<PAGE>   33
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 33 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         3,904,685 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         -0-
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         3,904,685 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         -0-
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           3,904,685 (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)

           7.8% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   34
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 34 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         1,822,432 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         -0-
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         1,822,432 (see Item 4 and Exhibit C)
                                   ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         -0-
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,822,432 (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)

           3.6% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>


<PAGE>   35
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 35 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    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
                                         1,619,940
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         -0-
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         1,619,940
                                  ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         -0-
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,619,940
- --------------------------------------------------------------------------------

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

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

           3.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   36
- -------------------                                               -------------
CUSIP NO. 01747T102                 13G                           Page 36 of 48
- -------------------                                               -------------

<TABLE>
<S>        <C>                                                    <C>
================================================================================
    1      NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE
           PERSON:

           John J. Callahan
- --------------------------------------------------------------------------------
    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
                                         607,477
                                   ---------------------------------------------
         BENEFICIALLY              6     SHARED VOTING POWER
           OWNED BY
                                         -0-
                                   ---------------------------------------------
             EACH                  7     SOLE DISPOSITIVE POWER
          REPORTING
                                         607,477
                                  ---------------------------------------------
            PERSON                 8     SHARED DISPOSITIVE POWER
             WITH
                                         -0-
- --------------------------------------------------------------------------------
    9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           607,477
- --------------------------------------------------------------------------------

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

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

           1.2% (see Item 4)
- --------------------------------------------------------------------------------
    12     TYPE OF REPORTING PERSON*

           IN
================================================================================
</TABLE>

<PAGE>   37
                                  SCHEDULE 13G

This 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
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


                                  Page 37 of 48

<PAGE>   38

         (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)

         (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
50,341,554 shares of Common Stock outstanding as of September 30, 1998, as
disclosed in the Company's Quarterly Report filed on Form 10-Q with the
Securities and Exchange Commission on November 5, 1998, for the fiscal quarter
ended September 30, 1998.

Madison Dearborn Funds

         (a) Amount beneficially owned: Madison Dearborn Capital Partners II,
L.P. ("MDCP II") is the direct owner of 10,302,247 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 10,302,247 shares of Common Stock held by
MDCP II.

         (b) Percent of class: 20.5%

         (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


                                  Page 38 of 48

<PAGE>   39
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: 20.5%

         (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 4,059,999 shares of Common Stock and Frontenac Masters VII
Limited Partnership (together with Frontenac VII Limited Partnership, the
"Frontenac Funds") is the direct owner of 203,000 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 4,262,999 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 10,900 shares (10,300
shares held by Mr. Crawford directly and 600 shares held by Mr. Crawford as
custodian for his son under the Uniform Gifts to Minors Act).

         (b) Percent of class: 8.5%

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

             sole power to vote or to direct the vote: -0- (10,900 as to 
             Mr. Crawford)

             shared power to vote or to direct the vote: 4,262,999

             sole power to dispose or to direct the disposition of: -0- (10,900
             as to Mr. Crawford)

             shared power to dispose or to direct the disposition of: 4,262,999


                                  Page 39 of 48

<PAGE>   40
Battery Funds

         (a) Amount beneficially owned: Battery Ventures IV, L.P. ("Battery IV")
is the direct owner of 2,099,527 shares of Common Stock and Battery Investment
Partners IV, LLC is the direct owner of 31,972 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 2,099,527
shares held by Battery IV and the Battery Funds may be deemed to beneficially
own, in the aggregate, 2,131,449 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: 4.2%

         (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: 2,131,449

             sole power to dispose or to direct the disposition of: -0-

             shared power to dispose or to direct the disposition of: 2,131,449

Royce J. Holland Family Limited Partnership and Royce J. Holland

         (a) Amount beneficially owned: 3,904,685 (1,960,533 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: 7.8%

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

             sole power to vote or to direct the vote: 3,904,685

             shared power to vote or to direct the vote: -0-

             sole power to dispose or to direct the disposition of: 3,904,685

             shared power to dispose or to direct the disposition of: -0-

Thomas M. Lord

         (a) Amount beneficially owned: 1,822,432 (911,216 shares held by
             Thomas M. Lord directly, and an aggregate of 911,216 shares held by
             Mr. Lord's spouse and children)

         (b) Percent of class: 3.6%

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

             sole power to vote or to direct the vote: 1,822,432


                                  Page 40 of 48

<PAGE>   41
             shared power to vote or to direct the vote: -0-

             sole power to dispose or to direct the disposition of: 1,822,432

             shared power to dispose or to direct the disposition of: -0-



C. Daniel Yost

         (a) Amount beneficially owned: 1,619,940.

         (b) Percent of class: 3.2%

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

             sole power to vote or to direct the vote: 1,619,940

             shared power to vote or to direct the vote: -0-

             sole power to dispose or to direct the disposition of: 1,619,940

             shared power to dispose or to direct the disposition of: -0-

John J. Callahan

         (a) Amount beneficially owned: 607,477.

         (b) Percent of class: 1.2%

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

             sole power to vote or to direct the vote: 607,477

             shared power to vote or to direct the vote: -0-

             sole power to dispose or to direct the disposition of: 607,477

             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.


                                 Page 41 of 48
<PAGE>   42
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 42 of 48


<PAGE>   43
                                    EXHIBITS


EXHIBIT A       Joint Filing Agreement

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

EXHIBIT C       Voting Agreement

EXHIBIT D       Powers of Attorney



                           Page 43 of 48

<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, 1999


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


MADISON DEARBORN PARTNERS II, L.P.

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

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


MADISON DEARBORN PARTNERS, INC.

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


                                  Page 44 of 48
<PAGE>   45

                                   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 12, 1999


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: /s/ PETER R. VOGELSANG
   -------------------------------------
Its:    Secretary
    ------------------------------------


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

By: /s/ PETER R. VOGELSANG
   -------------------------------------
Its:    Secretary
    ------------------------------------


MORGAN STANLEY CAPITAL PARTNERS III, INC.

By: /s/ PETER R. VOGELSANG
   -------------------------------------
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: /s/ PETER R. VOGELSANG 
   -------------------------------------
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: /s/ PETER R. VOGELSANG
   -------------------------------------
Its:    Secretary
    ------------------------------------


MORGAN STANLEY DEAN WITTER, DISCOVER & CO.

By: /s/ PETER R. VOGELSANG 
   -------------------------------------
Its:    Authorized Signatory
    ------------------------------------


                                 Page 45 of 48
<PAGE>   46
                                    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 12, 1999


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

By: /s/ Karen C. Fanelli           
   -------------------------------------
Karen C. Fanelli, Under Power of Attorney (attached hereto as Exhibit D)


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 (attached hereto as Exhibit D)


FRONTENAC COMPANY VII, LLC

By: /s/ Karen C. Fanelli           
   -------------------------------------
Karen C. Fanelli, Under Power of Attorney (attached hereto as Exhibit D)


   /s/ Karen C. Fanelli    
- ----------------------------------------
Karen C. Fanelli, under Power of Attorney (attached hereto as Exhibit D) 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 46 of 48
<PAGE>   47

                                    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 16, 1999


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 47 of 48
<PAGE>   48
                                    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, 1999



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


/s/ John J. Callahan   
- ----------------------------------------
JOHN J. CALLAHAN



                                 Page 48 of 48

<PAGE>   49
                               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

 D             Powers of Attorney
</TABLE>

<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, 1999


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



MADISON DEARBORN PARTNERS II, L.P.

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

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


MADISON DEARBORN PARTNERS, INC.

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



<PAGE>   2


              [Additional Signature Page to Joint Filing Agreement]


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: /s/ PETER R. VOGELSANG
   --------------------------------
Its: Secretary
    -------------------------------


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

By: /s/ PETER R. VOGELSANG
   --------------------------------
Its: Secretary
    -------------------------------


MORGAN STANLEY CAPITAL PARTNERS III, INC.

By: /s/ PETER R. VOGELSANG
   --------------------------------
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: /s/ PETER R. VOGELSANG
   --------------------------------
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: /s/ PETER R. VOGELSANG
   --------------------------------
Its: Secretary
    -------------------------------


MORGAN STANLEY DEAN WITTER, DISCOVER & CO.

By: /s/ PETER R. VOGELSANG
   --------------------------------
Its: Authorized Signatory
    -------------------------------



<PAGE>   3


              [Additional Signature Page to Joint Filing Agreement]


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

By: /s/ Karen C. Fanelli           
   --------------------------------
Karen C. Fanelli, Under Power of Attorney (attached hereto as Exhibit D)


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 (attached hereto as Exhibit D)


FRONTENAC COMPANY VII, LLC

By: /s/ Karen C. Fanelli           
   --------------------------------
Karen C. Fanelli, Under Power of Attorney (attached hereto as Exhibit D)


/s/ Karen C. Fanelli     
   --------------------------------
Karen C. Fanelli, under Power of Attorney (attached hereto as Exhibit D) 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


              [Additional Signature Page to Joint Filing Agreement]


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 for:
         Robert G. Barrett
         Oliver D. Curme
         Thomas J. Crotty
         Kenneth P. Lawler
         Todd A. Dagres



<PAGE>   5


              [Additional Signature Page to Joint Filing Agreement]



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


/s/ John J. Callahan   
- -----------------------------------
JOHN J. CALLAHAN

<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
<PAGE>   2


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 Family Limited Partnership, a Delaware limited partnership
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

John J. Callahan, citizen of the United States
c/o Allegiance Telecom, Inc.
1950 Stemmons Freeway
Suite 3026
Dallas, Texas 75207

<PAGE>   1


                                                                       EXHIBIT C

                                VOTING AGREEMENT

         The Company, MDCP II, the Morgan Stanley Funds, the Frontenac Funds,
the Battery Funds, Royce J. Holland Family Limited Partnership, Royce J.
Holland, Thomas M. Lord, C. Daniel Yost, John J. Callahan 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.

<PAGE>   1
                                                                       EXHIBIT D


                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

(1)  execute for and on behalf of the undersigned: (a) Forms 3, 4 and 5 in 
     accordance with Section 16(a) of the Securities Exchange Act of 1934, as
     amended (the "1934 Act"), and the rules promulgated thereunder; and (b)
     Schedule 13D or Schedule 13G, and any amendments thereto, on behalf of the
     undersigned in accordance with Section 13 of the 1934 Act and the rules
     promulgated thereunder;

(2)  do and perform any and all acts for and on behalf of the undersigned which 
     may be necessary or desirable to complete the execution of any such form
     or schedule and the timely filing of such form or schedule with the United
     States Securities and Exchange Commission and any other authority; and

(3)  take any other action of any type whatsoever in connection with the 
     foregoing which, in the opinion of such attorney-in-fact, may be of benefit
     to, in the best interest of, or legally required by, the undersigned, it
     being understood that the documents executed by such attorney-in-fact on
     behalf of the undersigned pursuant to this Power of Attorney shall be in
     such form and shall contain such terms and conditions as such
     attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, hereby ratifying and confirming all that such attorney-in-fact
shall lawfully do or cause to be done by virtue of this power of attorney and
the rights and powers herein granted. The undersigned acknowledges that the
foregoing attorney-in-fact, in serving in such capacity at the request of the
undersigned, is not assuming any of the undersigned's responsibilities to comply
with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this June 11, 1998.


                                 FRONTENAC VII LIMITED PARTNERSHIP
                                            

                                 BY: FRONTENAC COMPANY VII, L.L.C.
                                     its general partner


                                 BY: /s/ LAURA P. PEARL
                                     ---------------------
                                     a member
<PAGE>   2
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing
singly, as the undersigned's true and lawful authorized representative and
attorney-in-fact to:

(1)  execute for and on behalf of the undersigned: (a) Forms 3, 4 and 5 in
     accordance with Section 16(a) of the Securities Exchange Act of 1934, as
     amended (the "1934 Act"), and the rules promulgated thereunder; and (b)
     Schedule 13D or Schedule 13G, and any amendments thereto, on behalf of the
     undersigned in accordance with Section 13 of the 1934 Act and the rules
     promulgated thereunder;

(2)  do and perform any and all acts for and on behalf of the undersigned which
     may be necessary or desirable to complete the execution of any such form or
     schedule and the timely filing of such form or schedule with the United
     States Securities and Exchange Commission and any other authority; and

(3)  take any other action of any type whatsoever in connection with the
     foregoing which, in the opinion of such attorney-in-fact, may be of benefit
     to, in the best interest of, or legally required by, the undersigned, it
     being understood that the documents executed by such attorney-in-fact on
     behalf of the undersigned pursuant to this Power of Attorney shall be in
     such form and shall contain such terms and conditions as such
     attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, hereby ratifying and confirming all that such attorney-in-fact
shall lawfully do or cause to be done by virtue of this power of attorney and
the rights and powers herein granted. The undersigned acknowledges that the
foregoing attorney-in-fact, in serving in such capacity at the request of the
undersigned, is not assuming any of the undersigned's responsibilities to comply
with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this June 11, 1998.


                                 FRONTENAC MASTERS VII LIMITED
                                 PARTNERSHIP

                                 BY: FRONTENAC COMPANY VII, L.L.C.
                                     its general partner


                                 BY: /s/ LAURA P. PEARL
                                     ---------------------
                                     a member
<PAGE>   3
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

(1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
     accordance with Section 16(a) of the Securities Exchange Act of 1934, as
     amended (the "1934 Act"), and the rules promulgated thereunder; and (b)
     Schedule 13D or Schedule 13G, and any amendments thereto, on behalf of the
     undersigned in accordance with Section 13 of the 1934 Act and the rules
     promulgated thereunder;

(2)  do and perform any and all acts for and on behalf of the undersigned which
     may be necessary or desirable to complete the execution of any such form or
     schedule and the timely filing of such form or schedule with the United
     States Securities and Exchange Commission and any other authority; and

(3)  take any other action of any type whatsoever in connection with the
     foregoing which, in the opinion of such attorney-in-fact, may be of benefit
     to, in the best interest of, or legally required by, the undersigned, it
     being understood that the documents executed by such attorney-in-fact on
     behalf of the undersigned pursuant to this Power of Attorney shall be in
     such form and shall contain such terms and conditions as such
     attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this June 11, 1998.


                              FRONTENAC COMPANY VII, L.L.C.


                              BY: /s/ LAURA P. PEARL
                                 --------------------------
                                 a member
<PAGE>   4
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned 
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.


                              

                                 /s/ PAUL D. CARBERY
                                 --------------------------
                                 Paul D. Carbery
<PAGE>   5
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.


                              

                                 /s/ JAMES E. COWIE
                                 --------------------------
                                 James E. Cowie
<PAGE>   6
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.


                              

                                 /s/ JAMES E. CRAWFORD, III
                                 --------------------------
                                 James E. Crawford, III
<PAGE>   7
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned 
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.


                              

                                 /s/ RODNEY L. GOLDSTEIN
                                 --------------------------
                                 Rodney L. Goldstein
<PAGE>   8
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.


                              

                                 /s/ MARTIN J. KOLDYKE
                                 --------------------------
                                 Martin J. Koldyke
<PAGE>   9
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.


                              

                                 /s/ M. LAIRD KOLDYKE
                                 --------------------------
                                 M. Laird Koldyke
<PAGE>   10
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.


                              

                                 /s/ ROGER S. MCENIRY
                                 --------------------------
                                 Roger S. McEniry
<PAGE>   11
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this March 7, 1995.



                                 /s/ LAURA P. PEARL
                                 --------------------------
                                 Laura P. Pearl
<PAGE>   12
                               POWER OF ATTORNEY


     The undersigned hereby constitutes and appoints Karen C. Fanelli, signing 
singly, as the undersigned's true and lawful authorized representative and 
attorney-in-fact to:

     (1)  execute for and on behalf of the undersigned:  (a) Forms 3, 4 and 5 in
          accordance with Section 16(a) of the Securities Exchange Act of 1934,
          as amended (the "1934 Act"), and the rules promulgated thereunder; and
          (b) Schedule 13D or Schedule 13G, and any amendments thereto, on
          behalf of the undersigned in accordance with Section 13 of the 1934
          Act and the rules promulgated thereunder;

     (2)  do and perform any and all acts for and on behalf of the undersigned
          which may be necessary or desirable to complete the execution of any
          such form or schedule and the timely filing of such form or schedule
          with the United States Securities and Exchange Commission and any
          other authority; and

     (3)  take any other action of any type whatsoever in connection with the
          foregoing which, in the opinion of such attorney-in-fact, may be of
          benefit to, in the best interest of, or legally required by, the
          undersigned, it being understood that the documents executed by such
          attorney-in-fact on behalf of the undersigned pursuant to this Power
          of Attorney shall be in such form and shall contain such terms and
          conditions as such attorney-in-fact may approve in her discretion.

     The undersigned hereby grants to such attorney-in-fact full power and 
authority to do and perform all and every act and thing whatsoever requisite, 
necessary and proper to be done in the exercise of any of the rights and powers 
herein granted, hereby ratifying and confirming all that such attorney-in-fact 
shall lawfully do or cause to be done by virtue of this power of attorney and 
the rights and powers herein granted. The undersigned acknowledges that the 
foregoing attorney-in-fact, in serving in such capacity at the request of the 
undersigned, is not assuming any of the undersigned's responsibilities to 
comply with Section 16 or Section 13 or any other provision of the 1934 Act.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to 
be executed as of this January 20, 1998.


                                 /s/ JEREMY H. SILVERMAN
                                 --------------------------
                                 Jeremy H. Silverman


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