Italian satellite TV provider Sky Italia and Englewood, Colo.-based CSG Systems, a subsidiary of CSG Systems International [Nasdaq: CSGS], have signed an agreement to expand Sky Italia’s customer billing platform. Financial terms of the deal weren’t disclosed. Under the new deal, Sky Italia will support up to four million subscribers using CSG’s Kenan/BP, a billing platform that rates and bills for a transaction-based service in the mobile, wireline, cable/satellite and IP market.