EX-21.01 4 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, 2006

 

Subsidiary

   

State or Country

of Incorporation

CSG Systems, Inc.

    Delaware

CSG Services, Inc.

    Delaware

CSG International Holdings LLC

    Delaware