(In topic `Network Architectures`) SS7 (Signaling System 7) is a telecommunications protocol defined by the ITU that is characterised by high-speed packet switching. It is used in the US telephone system to set up calls and enable new transaction services such as caller ID.
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Signalling System 7 - main exchange signalling protocol.
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Signaling System 7 [Bellcore]
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The ITU Common Channel Signaling System Number 7 - a set of low level protocols used to control activities in telecommunications networks. SS7 is used in both fixed and mobile networks and is the basis for GSM MAP, IS-41, IN and their derivatives. Some SS7-like functionality has begun to appear in Internet protocols to support VoIP (voice over IP). An example is SIP (session initiation protocol).
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