Exhibit 12.1

CSG Systems International, Inc.

Ratio of Earnings to Fixed Charges

(in thousands, except ratios)

	Years ended December 31,											Three months ended March 31,
	1999		2000		2001		2002		2003(1)			2004
Income (loss) from continuing operations before income taxes	$	95,929	$	145,203	$	183,442	$	87,544	$	(48,460	)	$	17,500
Fixed Charges:
Interest on long-term and short-term debt including amortization of debt expense		7,214		5,808		3,038		14,033		14,717			3,554
Interest element of rentals		2,080		3,040		4,240		11,600		9,720			2,390
Total fixed charges		9,294		8,848		7,278		25,633		24,437			5,944
Earnings before income taxes and fixed charges	$	105,223	$	154,051	$	190,720	$	113,177	$	(24,023	)	$	23,444
Ratio of earnings to fixed charges		11.32		17.41		26.21		4.42		—			3.94

(1) As a result of the Comcast arbitration ruling, we recognized a loss from continuing operations before income taxes for the year ended December 31, 2003. The amount of the coverage deficiency for the historical year ended December 31, 2003 was $48.5 million.