 
Telephone Switching Systems Pbx
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PBX
(Private Branch Exchange) - The main switching unit in a multi-line
digital phone system. The PBX routes calls to voice mail,
manages Direct Inward Dial (DID), station-to-station calling,
transferring, internal and external conferencing, voice mail,
music-on-hold (when applicable) and other manufacturer-specific
functions. PBX systems are usually digital systems designed
for a large number of users, although there are exceptions.
Telephone Switching Systems Pbx
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