Private Automatic Branch eXchange
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private automatic branch exchange[′prī·vət ¦ȯd·ə‚mad·ik ′branch iks‚chānj]
A private branch exchange in which connections are made by remote-controlled switches. Abbreviated PABX.
Private Automatic Branch eXchange(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.