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EXHIBIT 32.01
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The certification set forth below is being submitted in connection with the Annual Report on Form 10-K (the “Report”) for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code.
Peter E. Kalan, the Chief Executive Officer and Randy R. Wiese, the Chief Financial Officer of CSG Systems International, Inc., each certifies that, to the best of his knowledge:
| (1) | the Report fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act; and |
| (2) | the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of CSG Systems International, Inc. |
| February 23, 2010 |
| /s/ Peter E. Kalan |
| Peter E. Kalan |
| Chief Executive Officer and President |
| February 23, 2010 |
| /s/ Randy R. Wiese |
| Randy R. Wiese |
| Executive Vice President and Chief Financial Officer |