Interconnect User Part (IUP) is a national specific
Signaling System 7
Signalling System No. 7 (SS7) is a set of telephony signaling protocols developed in 1975, which is used to set up and tear down telephone calls in most parts of the world-wide public switched telephone network (PSTN). The protocol also perform ...
protocol for interconnect between public
telephone networks in the
United Kingdom. This protocol was formerly known as BTNUP.
It is specified in document PNO-ISC/SPEC/006 which is published by th
NICCa
ND1006:2007/05
Signaling System 7
Integrated Services Digital Network
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