SS7

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Definition:

Signaling System 7 (SS7) is an architecture for  performing out-of-band signaling in support of the call-establishment, billing, routing, and information-exchange functions of the public switched telephone network (PSTN). It identifies functions to be performed by a signaling system network and a protocol to enable their performance.

What is Signaling?
Signaling refers to the exchange of information between call components
required to provide and maintain service.

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