Cerillion Plc engages in the supply and development of telecommunication software solutions and equipment. It operates through the following segments: Services, Software, and Other. The Services segment offers services to customers on new implementation projects and enhancements. The Software segment consists of software licenses and related support and maintenance sales. The Other segment focuses on third-party services, re-billable expenses, and pass through of selling on hardware. The company was founded by Louis Tancred Hall and Guy Jason O'Connor in October 1999 and is headquartered in London, the United Kingdom.