<SEC-DOCUMENT>0001564590-21-017722-index.html : 20210406
<SEC-HEADER>0001564590-21-017722.hdr.sgml : 20210406
<ACCEPTANCE-DATETIME>20210406110515
ACCESSION NUMBER:		0001564590-21-017722
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20210406
DATE AS OF CHANGE:		20210406

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CSG SYSTEMS INTERNATIONAL INC
		CENTRAL INDEX KEY:			0001005757
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROCESSING & DATA PREPARATION [7374]
		IRS NUMBER:				470783182
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-27512
		FILM NUMBER:		21808405

	BUSINESS ADDRESS:	
		STREET 1:		6175 SOUTH WILLOW DRIVE
		CITY:			GREENWOOD VILLAGE
		STATE:			CO
		ZIP:			80111
		BUSINESS PHONE:		3037962850

	MAIL ADDRESS:	
		STREET 1:		6175 SOUTH WILLOW DRIVE
		CITY:			GREENWOOD VILLAGE
		STATE:			CO
		ZIP:			80111
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>csgs-defa14a_20210520.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: csgs-defa14a_20210520.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>gqgwswkorets000002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: gqgwswkorets000002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>gqgwswkorets000001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: gqgwswkorets000001.jpg

</DOCUMENT>
</SEC-DOCUMENT>