SS7 Tutorial - SS7 Tutorial Overview Common Channel...

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SS7 Tutorial Overview Common Channel Signaling System No. 7 (i.e., SS7 or C7 ) is a global standard for telecommunications defined by the International Telecommunication Union (ITU) Telecommunication Standardization Sector (ITU-T). The standard defines the procedures and protocol by which network elements in the public switched telephone network (PSTN) exchange information over a digital signaling network to effect wireless (cellular) and wireline call setup, routing and control. The ITU definition of SS7 allows for national variants such as the American National Standards Institute (ANSI) and Bell Communications Research (Telcordia Technologies) standards used in North America and the European Telecommunications Standards Institute (ETSI) standard used in Europe. The SS7 network and protocol are used for: basic call setup, management, and tear down wireless services such as personal communications services (PCS), wireless roaming, and mobile subscriber authentication local number portability (LNP) toll-free (800/888) and toll (900) wireline services enhanced call features such as call forwarding, calling party name/number display, and three-way calling efficient and secure worldwide telecommunications Learn about our SS7/IP signaling products . Signaling Links SS7 messages are exchanged between network elements over 56 or 64 kilobit per second (kbps) bidirectional channels called signaling links . Signaling occurs out-of-band on dedicated channels rather than in-band on voice channels. Compared to in-band signaling, out-of-band signaling provides:
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