see Closed Circuit Television
see Central Control Unit
see Call Detail Record
The Central Control Unit (CCU) is the box or cabinet that houses the hardware controlling the telephone system.
Centrex (short for Central Exchange) is a hosted telephony solution providing the functionality of a PBX without the costs and logistics associated with a physical on-premise system.
The ability to give a data packet a series of set properties/restrictions/access levels during a telephone call. E.g. A user can be given a COS value of 1 that permits international dialling while the value of 2 disables this ability.
see Calling Line Identity
see Calling Line Identity Presentation
see Calling Line Identity Restriction
Closed Circuit Television (CCTV) is the security and surveillance devices that can aide with access control and the broader protection of premises.
Cloud can relate to any kind of infrastructure, platform or applications that are hosted on a server not located at the premises using it, accessed via the internet. E.g. cloud communications enable the functionality of a telephone system with no requirement for an on-site PBX.
A codec is a device or piece of computer software for coding or decoding digital data streams or signals.