PRI (Primary Rate Interface)

PRI (Primary Rate Interface) – This voice service is built off of a T1 circuit and provides 23 channels (lines) for either inbound or outbound calling. The 24th channel, D Channel, provides the inbound and outbound caller ID features and also maintains the timing between the PBX and the telecom provider.
http://en.wikipedia.org/wiki/Primary_Rate_Interface



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