High Quality Content by WIKIPEDIA articles! The Central Communications Command (CCC, also known as Metcall) is the largest Operational Command Unit OCU of London`s Metropolitan Police Service. It sits within Territorial Policing, the business group within the Met that is responsible for Borough Policing and public contact. It is responsible for receiving emergency and non-emergency public telephony within the Metropolitan Police and between the police and the public & other forces, taking over from a number of smaller communications rooms scattered throughout the service. The "C3i programme", intended to modernise command and control and combine the MPS`s communications into a single department was led by Sir Ian Blair prior to his promotion to Commissioner; the transition to the new system began in 2004 and was completed in December 2007. The OCU was intended to be known as "Metcall", selected by an internal staff competition, but this name is the registered property of the UK Meteorological Office. There are three main command-and-control at Hendon, Bow and Lambeth.