Cerillion Plc engages in the supply and development of telecommunication software solutions and equipment. It operates through the following segments: Services, Software-as-a-Service, and Third Party. The Services segment offers software implementations and ongoing account development work. The Software-as-a-Service segment comprises software licences and related support and maintenance sales. The Third Party segment engages in reselling of third party products. The company was founded by Louis Tancred Hall and Guy Jason O'Connor in 1999 and is headquartered in London, the United Kingdom.