UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 4
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
(X) Check this box if no longer subject to Section 16.
1. Name and Address of Reporting Person
PARKER, GREG A.
7887 E. Belleview Avenue
Suite 1000
Englewood, CO 80111
USA
2. Issuer Name and Ticker or Trading Symbol
CSG Systems International, Inc. (CSGS)
3. IRS or Social Security Number of Reporting Person (Voluntary)
4. Statement for Month/Year
8/2000
5. If Amendment, Date of Original (Month/Day/Year)
6. Relationship of Reporting Person(s) to Issuer (Check all applicable)
( ) Director ( ) 10% Owner
( ) Officer (give title below) (X) Other (specify below)
Chief Financial Officer
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>
TABLE I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
<CAPTION>
+---------------------------------+----------+-------------+-----------------------------+----------------+-----------+------------+
|1. Title of Security |2. Trans- |3. Trans- |4. Securities Acquired (A) |5. Amount of |6. Owner- |7. Nature |
| | action | action | or Disposed of (D) | Securities | ship | of In- |
| | Date | Code | | Beneficially | Form: | direct |
| | | | | Owned at | Direct | Bene- |
| | (Month/ | | | End of | (D) or | ficial |
| | Day/ +-------+-----+-----------+------+----------+ Month | Indirect| Owner- |
| | Year) |Code |V |Amount |A/D |Price | | (I) | ship |
+---------------------------------+----------+-------+-----+-----------+------+----------+----------------+-----------+------------+
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C>
Common Stock 08/16/2000 S -12000 D $46.750000 D
Common Stock 08/17/2000 M 4000 A $7.500000 D
Common Stock 08/17/2000 D V -4000 D $46.053200 D
Common Stock 08/17/2000 D V -12000 D $46.187500 D
Common Stock 08/24/2000 M 3000 A $14.875000 D
Common Stock 08/24/2000 M 10000 A $14.843800 D
Common Stock 08/24/2000 D V -3000 D $47.500000 D
Common Stock 08/24/2000 D V -10000 D $47.500000 0 D
</TABLE>
<PAGE>
<TABLE>
TABLE II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned
<CAPTION>
+-------------+--------+----------+---------+-----------+---------------------+----------------+----------+--------+-------+-------+
|1. |2. |3. |4. |5. |6. |7. |8. |9. |10. |11. |
| | | | | | | | |Number |Owner- | |
| | | | | | | | |of |ship | |
| | | | | | | | |Deriv- |Form of| |
| | | | | | |Title and Amount| |ative |Deriv- | |
| | | | | | |of Underlying | |Secur- |ative |Nature |
| |Conver- | | |Number of | |Securities | |ities |Secur- |of |
| |sion or | | |Derivative |Date Exercisable +-------+--------+ |Benefi- |ity: |In- |
| |Exercise| | |Securities |and Expiration Date | |Amount | |cially |Direct |direct |
| |Price of|Transac- |Transac- |Acquired(A)|(Month/Day/Year) | |or | |Owned |(D) or |Bene- |
|Title of |Deriv- |tion Date |tion Code|Disposed(D)+----------+----------+ |Number |Price of |at End |In- |ficial |
|Derivative |ative |(Month/ +------+--+-----+-----+Date Exer-|Expira- | |of |Derivative|of |direct |Owner- |
|Security |Security|Day/Year) |Code |V |(A) |(D) |cisable |tion Date |Title |Shares |Security |Month |(I) |ship |
+-------------+--------+----------+------+--+-----+-----+----------+----------+-------+--------+----------+--------+-------+-------+
<S> <C> <C> <C> <C><C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
Stock Options $7.5 08/17/2000 M 4000 02/22/1997 11/18/2000 Common 4000 $46.053200 D
(Right to buy) Stock
Stock Options $7.5 08/18/2000 H V 4000 02/22/1997 11/18/2000 Common 4000 $0.000000 0 D
(Right to buy) Stock
Stock Options $9.6875 08/18/2000 H V 2618 01/28/1998 11/18/2000 Common 2618 $0.000000 D
(Right to buy) Stock
Stock Options $9.6875 08/18/2000 H V 4732 01/28/1998 11/18/2000 Common 4732 $0.000000 0 D
(Right to buy) Stock
Stock Options $14.8438 08/24/2000 M 10000 08/14/1998 11/18/2000 Common 10000 $47.500000 15000 D
(Right to buy) Stock
Stock Options $14.875 08/24/2000 M 3000 06/06/1997 11/18/2000 Common 3000 $47.500000 3000 D
(Right to buy) Stock
Stock Options $21.125 08/18/2000 H V 35268 01/20/1999 11/18/2000 Common 35268 $0.000000 D
(Right to buy) Stock
Stock Options $21.125 08/18/2000 H V 4732 11/18/2000 11/18/2000 Common 4732 $0.000000 17732 D
(Right to buy) Stock
Stock Options $26.7188 08/18/2000 H V 3742 08/18/2000 08/18/2000 Common 3742 $0.000000 0 D
(Right to buy) Stock
Stock Options $26.7188 08/18/2000 H V 96258 11/18/2000 11/18/2000 Common 96258 $0.000000 0 D
(Right to buy) Stock
Stock Options $38.4375 08/18/2000 H V 2601 11/18/2000 11/18/2000 Common 2601 $0.000000 D
(Right to buy) Stock
Stock Options $38.4375 08/18/2000 H V 22399 11/18/2000 11/18/2000 Common 22399 $0.000000 0 D
(Right to buy) Stock
</TABLE>
Explanation of Responses:
SIGNATURE OF REPORTING PERSON
/s/ GREG A. PARKER
DATE
09/08/2000
