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Private Branch Exchange

<communications> (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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PRISM Prisoner of Bill privacy Privacy Enhanced Mail Private Automatic Branch eXchange	PBX Primary Rate Interface	private-key cryptography Private Manual Branch eXchange privileged instruction PRL PRMD