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private branch exchange

   Also found in: Wikipedia 0.01 sec.

See PBX.

(communications)Private Branch Exchange - (PBX) A telephone exchange local to a particular organisation who use, rather than provide, telephone services. The earliest PBXs were manual (Private Manual Branch EXchange, PMBX) but are now more likely to be automatic (Private Automatic Branch eXchange).
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As they migrate to these offerings, however, they need to securely connect their IP Private Branch eXchange (PBX) and other SIP-based systems - like Microsoft Office Live Communications Server - between sites or back to their IP service provider.
Covergence Delivers the CXC-50, Providing Complete VoIP Security and ... by Business Wire
IP Centrex/Hosted PBX is a hybrid of two different voice-switching systems, legacy Centrex and legacy Private Branch Exchange (PBX) solutions.
In-Stat Reports Demand in SME Space to Drive IP Centrex/Hosted PBX ... by Business Wire
The user simply speaks the name of the person listed in their contact list and through a TAPI, the Name Dialer sends a signal to the Private Branch Exchange (PBX) to initiate dialing automatically.
SpeechSwitch Receives Patent Award For 'TAPI Interface Based, Speech ... by Business Wire
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