P
Packet
In data communication, the basic unit of information transferred.
PBX (Private Branch Exchange) or PABX (privated automated bench exchange)
An in-house telephone switching system that interconnects telephone extensions to each other, as well as to the outside telephone network.
PRI (Primary Rate Interface)
An ISDN service that provides 23 64-Kbps B (Bearer) channels and one 64-Kbps D (Data) channel (23 B and D).
PSTN
Public Switched Telephone Network.
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