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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.

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priority scheduling PRISM Prisoner of Bill privacy Privacy Enhanced Mail	PABX Private Branch Exchange	Private Branch Exchange private-key cryptography Private Manual Branch eXchange privileged instruction PRL