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V5 interface

V5 is a set of protocols defined by ETSI by which a multiplexer in the access network of the PSTN can communicate with a telephone exchange. The protocols are designed to handle both POTS and ISDN traffic. They are based on the principle of common channel signalling where message-based signalling for all subscribers uses the same signalling channel(s) rather than separate channels existing for different subscribers.

V5 comes in two forms:

The protocols

To do !

Control protocol

PSTN protocol

BCC protocol

Link control protocol

Protection protocol