An Introduction to SS7

SS7 or Signaling System Number 7 is a set of protocols that describes a means of communication between telephone switches in public telephone networks. SS7 is a highly sophisticated and powerful form of Common Channel Signaling (CCS). The use of out-of-band signaling procedures offers considerable benefits over and above other signaling methodologies. SS7 network architecture is explored in detail, as are basic call procedures. SS7 is discussed in relation to a variety of different network applications and signaling functions. The future role of SS7 is examined. The paper concludes by introducing Brooktrouts world-leading SS7 capabilities.

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