1. Name and Address of Reporting Person
   FISHER, WILLIAM E.
   7887 E. Belleview Avenue
   Suite 1000
   Englewood, CO 80111
   USA
2. Date of Event Requiring Statement (Month/Day/Year)
   09/19/2001
3. IRS or Social Security Number of Reporting Person (Voluntary)
4. Issuer Name and Ticker or Trading Symbol
   CSG Systems International, Inc. (CSGS)
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)
   ( ) Director                   ( ) 10% Owner
   (X) Officer (give title below) ( ) Other (specify below)
   Executive Vice President
6. If Amendment, Date of Original (Month/Day/Year)
   09/25/2001
7. Individual or Joint/Group Filing (Check Applicable Line)
   (X) Form filed by One Reporting Person
   ( ) Form filed by More than One Reporting Person

TABLE I -- Non-Derivative Securities Beneficially Owned

+------------------------------------------+----------------------+----------------+-----------------------------------------------+
|1. Title of Security                      |2. Amount of          |3. Ownership    |4. Nature of Indirect Beneficial Ownership     |
|                                          |   Securities         |   Form:        |                                               |
|                                          |   Beneficially Owned |   Direct(D) or |                                               |
|                                          |                      |   Indirect(I)  |                                               |
+------------------------------------------+----------------------+----------------+-----------------------------------------------+
                                                                           





TABLE II -- Derivative Securities Beneficially Owned

+-----------------------+---------------------+---------------------------------+----------+-------------+-------------------------+
|1.Title of Derivative  |2.Date Exercisable   |3.Title and Amount of Securities |4.Conver- |5.Ownership  |6. Nature of Indirect    |
|  Security             |  and Expiration Date|  Underlying Derivative          | sion or  | Form of     |   Beneficial Ownership  |
|                       |  (Month/Day/Year)   |  Security                       | Exercise | Derivative  |                         |
|                       +----------+----------+-----------------------+---------+ Price of | Security:   |                         |
|                       | Date     | Expira-  |                       |Amount or| Deri-    | Direct(D) or|                         |
|                       | Exer-    | tion     |         Title         |Number of| vative   | Indirect(I) |                         |
|                       | cisable  | Date     |                       |Shares   | Security |             |                         |
+-----------------------+----------+----------+-----------------------+---------+----------+-------------+-------------------------+
                                                                                     
Stock Options (Right to  09/19/2002 09/19/2011 Common Stock            100000    $41.95     D
buy) 

Explanation of Responses:


This stock option is exercisable in 4 equal installments.



SIGNATURE OF REPORTING PERSON
/s/ WILLIAM E. FISHER

DATE
09/25/2001