EXHIBIT 12.10

CSG Systems International, Inc.

Ratio of Earnings to Fixed Charges

(in thousands, except ratio)

	Three Months Ended March 31, 2006 (unaudited)
Income from continuing operations before income taxes	$	24,931
Fixed Charges:
Interest on long-term and short-term debt including amortization of debt expense		1,885
Interest element of rentals		898
Total fixed charges		2,783
Earnings before income taxes and fixed charges	$	27,714
Ratio of earnings to fixed charges		9.96