EX-21.01 5 dex2101.htm SUBSIDIARIES OF THE REGISTRANT Subsidiaries of the Registrant

EXHIBIT 21.01

CSG Systems International, Inc.

Subsidiaries of the Registrant

As of December 31, 2007

 

Subsidiary

    State or Country
of Incorporation

CSG Systems, Inc.

    Delaware

CSG Services, Inc.

    Delaware

CSG International Holdings LLC

    Delaware

Prairie Interactive Messaging, Inc.

    Delaware