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A private branch exchange (PBX) is a phone exchange that serves a particular business or office, as opposed to a single that a typical carrier or telephone business operates for several organizations or for the basic public. PBXs are also referred to as:
PABX – private automatic branch exchange
EPABX – electronic private automatic branch exchange
PBXs make connections amongst the internal telephones of a private organization-usually a business-and also connect them to the public switched phone network (PSTN) by way of trunk lines. Because they include telephones, fax machines, modems, and far more, the general expression “extension” is employed to refer to any end point on the branch.
PBXs are differentiated from “essential systems” in that users of key systems manually select their own outgoing lines, even though PBXs decide on the outgoing line immediately. Hybrid systems mix attributes of the two.
Initially, the primary advantage of PBXs was cost cost savings on internal cellphone calls: handling the circuit switching locally lowered charges for nearby cellphone service. As PBXs gained popularity, they began supplying services that had been not obtainable in the operator network, this kind of as hunt groups, call forwarding, and extension dialing. In the 1960s a simulated PBX acknowledged as Centrex offered similar capabilities from the central phone exchange.
Two significant developments for the duration of the 1990s led to new types of PBX systems. A single was the substantial growth of information networks and increased public understanding of packet switching. Companies required packet switched networks for data, so employing them for telephone calls was tempting, and the availability of the World wide web as an international delivery program created packet switched communications even more appealing. These aspects led to the improvement of the VoIP PBX. (Technically, nothing at all was being “exchanged” any far more, but the abbreviation PBX was so broadly understood that it remained in use.)
The other trend was the thought of focusing on core competence. PBX services had often been tough to organize for smaller sized businesses, and numerous businesses realized that handling their personal telephony was not their core competence. These concerns gave rise to the concept of hosted PBX. In a hosted setup, the PBX is located at and managed by the phone service provider, and features and calls are delivered via the Web. The consumer just signs up for a service, rather than purchasing and preserving expensive hardware. This basically removes the branch from the private premises, moving it to a central place.
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