In telecommunication, a Centrex service (CTX) is a service offered by Bell Operating Companies that provides functions and features comparable to those provided by a PBX or a PABX. Note: "CentrexC.O." indicates that all equipment except the attendant's position and station equipment is located in the central office. "CentrexC.U." indicates that all equipment, including the dial switching equipment, is located on the customer's premises.
Centrex is a service provided by your local phone company, sometimes under various service marks; for example in New England, available is Centrexservice called CustoPak, which is a service mark of Verizon.
Centrex is a service originally intended to provide multi-location businesses with the ability to tie their locations together as though (from a telephone standpoint) they were in one location.
Centrex is highly reliable, as it is a partition of a CO, and COs are among the most highly reliable systems in the world.
Centrex is a set of specialized business solutions (primarily, but not exclusively, for voice service) where the equipment providing the call control and service logic functions is owned and operated by the service provider and hence is located on the service provider's premises.
IP Centrex refers to a number of IP telephony solutions where Centrexservice is offered to a customer who transmits its voice calls to the network as packetized streams across a broadband access facility.
In analog Centrex, one pair of copper wires is need to serve each analog telephone station, regardless of whether the phone has an active call; one the phone is not engaged in a call, the bandwidth capacity of those wires is unused.
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