8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 or 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): April 30, 2008

CSG SYSTEMS INTERNATIONAL, INC.

(Exact name of registrant as specified in its charter)

Delaware	0-27512	47-0783182
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

9555 Maroon Circle, Englewood, CO	80112
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (303) 200-2000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01 Regulation FD Disclosure.

The following information is furnished pursuant to Item 7.01 (Regulation FD Disclosure). This information shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

On May 1, 2008, CSG Systems International, Inc. (“CSG”) issued a press release announcing that it had completed the acquisition of DataProse, Inc. on April 30, 2008. CSG initially announced the acquisition on April 17, 2008.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibit

99.1       Press release of CSG Systems International, Inc. dated May 1, 2008.

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: May 1, 2008	CSG SYSTEMS INTERNATIONAL, INC.
	By:	/s/ Randy Wiese
		Randy Wiese, Principal Accounting Officer

3

CSG Systems International, Inc.

Form 8-K

Exhibit Index

99.1 Press release of CSG Systems International, Inc. dated May 1, 2008

4

EX-99.1

Exhibit 99.1

NEWS RELEASE

FOR IMMEDIATE RELEASE

CSG SYSTEMS COMPLETES ACQUISITION OF DATAPROSE, INC.

ENGLEWOOD, Colo. (May 1, 2008) — CSG Systems International, Inc. (NASDAQ: CSGS), a leading provider of customer care and billing solutions, today announced that it has completed the acquisition of DataProse, Inc. CSG initially announced the acquisition on April 17, 2008.

About CSG Systems

Headquartered in Englewood, Colorado, CSG is a leading provider of outsourced solutions that facilitate customer interaction management on the behalf of our clients, generating a large percentage of revenues from the North American cable and Direct Broadcast satellite (“DBS”) communications markets. Our solutions also support an increasing number of other industries such as financial services, utilities, telecommunications, and home security. Our solutions manage key customer interactions such as set-up and activation of customer accounts, sales support and marketing, order processing, invoice calculation (i.e., customer billing), production and mailing of monthly customer invoices, management reporting, electronic presentment and payment of invoices, automated and interactive messaging, and deployment and management of the client’s field technicians to the customer’s home. Our unique combination of solutions, services, and expertise ensure that our clients can rapidly launch new service offerings, improve operational efficiencies, and deliver a high-quality customer experience in a competitive and ever-changing marketplace. For more information, visit our website at www.csgsystems.com.

Forward-Looking Statements

This news release contains forward-looking statements as defined under the Securities Act of 1933, as amended, that are based on assumptions about a number of important factors and involve risks and uncertainties that could cause actual results to differ materially from what appears in this news release. These factors include, but are not limited to: 1) the concentration of approximately two-thirds of CSG’s revenues with four clients; as a result, the loss of business from any one of those clients could potentially have a material adverse impact to CSG’s financial results; 2) continued market acceptance of CSG’s Advanced Convergent Platform (ACP) and related products and services; 3) CSG’s ability to continuously develop and enhance products in a timely, cost-effective, technically advanced and competitive manner; 4) CSG’s dependency on the North American communications industry; as a result, key market factors such as further industry consolidation, new market entrants that may not be clients of CSG, economic conditions,

and/or the financial status of CSG clients may affect CSG’s ability to maintain and expand market share; 5) increasing competition in our market from companies of greater size and with broader presence in the communications sector, thus exerting greater influence over client buying decisions; 6) CSG’s ability to successfully integrate and manage acquired businesses, technology or assets to achieve the expected strategic, operating and financial goals established for such acquisitions; 7) CSG’s continued ability to protect its intellectual property rights; and 8) CSG’s dependency on a variety of computing environments and communications networks, thus subjecting CSG to the risks of extended interruptions, outages, unauthorized access and corruption of data. This list is not exhaustive and readers are encouraged to review the additional risks and important factors described in CSG’s reports on Forms 10-K and 10-Q and other filings made with the SEC.

For more information, contact:

Media Relations:

Elise Brassell

CSG Systems

Phone: (303) 804-4962

E-mail: elise_brassell@csgsystems.com

Investor Relations:

Roger Metz

CSG Systems

Phone: (303) 804-4082

E-mail: roger_metz@csgsystems.com

###