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): December 22, 2001 	 CSG SYSTEMS INTERNATIONAL, INC. - ------------------------------------------------------------------------------- (Exact name of registrant as specified in its charter) Delaware 0-27512 47-0783182 	---------		----------	 ------------ (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification 		 Number) 	7887 East Bellevue Avenue, Suite 1000, Englewood, CO 80111 - ------------------------------------------------------------------------------- 	(Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (303) 796-2850 Item 5. Other Events and Regulation FD Disclosure. - ------- ------------------------------------------ On December 22, 2001, the registrant issued a press release relating to an agreement to acquire the billing and customer care assets of Lucent Technologies. A copy of such press release is attached to this Form 8-K as Exhibit 99.1. Item 7. Financial Statements and Exhibits. - ------- ---------------------------------- (c)	Exhibit 	99.1 	Press release of CSG Systems International, Inc. dated 		December 22, 2001. 				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: December 27, 2001 				CSG SYSTEMS INTERNATIONAL INC. 				By: /s/ Joseph T. Ruble 				 ------------------- 					 Joseph T. Ruble, Secretary 					 and General Counsel 			CSG Systems International, Inc. 			 Form 8-K 		 	 Exhibit Index 	99.1	Press release of CSG Systems International, Inc. dated 		December 22, 2001. 						3 2