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Computing (FOLDOC) dictionary
Private Automatic Branch eXchange
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communications (PABX) A telephone exchange operated within
an organisation, used for switching calls between internal
lines and between internal and PSTN lines. In contrast to a
PMBX, a PABX can route calls without manual intervention,
based entirely on the number dialed. Not all PABXs can route
external calls to internal numbers automatically however.