SS7

GSM Glossary

GSM — SS7

Information on SS7 (Signalling System Number 7)

The SS7 (Signalling System Number 7) is an ITU standard for signalling in telephone networks.
     SS7 (Signalling System Number 7) is an international telecommunications standard developed by the International Telecommunication Union (ITU) Telecommunication Sector (ITU-T). The SS7 standard defines the procedures and protocols by which elements in the public switched telephone network (PSTN) exchange out-of-band signalling information over a digital signalling network. The protocols and procedures define such things as call set-up and tear-down, call management, call routing, call forwarding, display of calling party number, wireless services, and so on. The SS7 standard refers to out-of-band signalling, that is signalling that is not sent down the same channel as the voice call.
     In GSM, the SS7 (Signalling System Number 7) is used for all signalling on all links except for the air interface (or radio interface).

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