CSG Systems International, Inc. revenue for the last year amounted to 1.08 B USD, the most of which — 1.02 B USD — came from its highest performing source at the moment, Software as a Service and Related Solutions, the year earlier bringing 957.00 M USD. The greatest contribution to the revenue figure was made by Americas (Principally the United States) — last year it brought CSG Systems International, Inc. 999.73 M USD, and the year before that — 928.10 M USD.