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SS7

Signaling System #7 (SS7) is a set of telephony signaling protocols which are used to set up most of the world's public switched telephone calls, also used in mobile messaging, prepaid billing and other applications.

Signaling System #7 (SS7) is a set of telephony signaling protocols which are used to set up most of the world’s public switched telephone calls, also used in mobile messaging, prepaid billing and other applications.