    <SEC-DOCUMENT>0001308179-23-000488-index.html : 20230403
    <SEC-HEADER>0001308179-23-000488.hdr.sgml : 20230403
    <ACCEPTANCE-DATETIME>20230403140424
    ACCESSION NUMBER:		0001308179-23-000488
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		6
    FILED AS OF DATE:		20230403
    DATE AS OF CHANGE:		20230403

    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:		23791867

    	BUSINESS ADDRESS:
    		STREET 1:		169 INVERNESS DR W
    		STREET 2:		SUITE 300
    		CITY:			ENGLEWOOD
    		STATE:			CO
    		ZIP:			80112
    		BUSINESS PHONE:		3037962850

    	MAIL ADDRESS:
    		STREET 1:		169 INVERNESS DR W
    		STREET 2:		SUITE 300
    		CITY:			ENGLEWOOD
    		STATE:			CO
    		ZIP:			80112
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>lcsgs2023_defa14a.htm
    <DESCRIPTION>CSG SYSTEMS INTERNATIONAL INC - DEFA14A
    <TEXT>
    Document 1 - file: lcsgs2023_defa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>check01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: check01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>lcsgs2023_notice1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: lcsgs2023_notice1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>lcsgs2023_notice2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: lcsgs2023_notice2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>logo.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: logo.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>uncheck.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: uncheck.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>