![]() ![]() This is the origin of the split signaling and bearer distinction. The entire goal of the architecture was to free up lines for phone calls by removing the signaling from the bearer channel. SS7 is an old protocol, from around 1980, and is, in fact, the seventh version of the protocol. Unlike Q.931, which is designed for simplicity, SS7 is a complete, Internet-like architecture and set of protocols, designed to allow call signaling and control to flow across a small, shared set of circuits dedicated for signaling, freeing up the rest of the circuits for real phone calls. ![]() ![]() Signaling System #7 (SS7) is the protocol that makes the public telephone networks operate, within themselves and across boundaries. Joseph Epstein, in Scalable VoIP Mobility, 2009 2.2.7 SS7
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