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Essential Guide to Telecommunications, The, Third Edition by Annabel Z. Dodd

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Network Intelligence and Signaling

Signals in public networks are used for billing, monitoring, links to advanced features and for carriers to exchange traffic with each other. The public network owes much of its reliability, advanced features and interoperability to signaling.

Overview of Signaling

Signaling is used to process every switched call on the public switched network and the public cellular network. The caller dials a number and hears progress tones such as dial tone, ringing, busy signals or reorder tones. These are all signaling tones carried within the public network. In addition to tones, callers might hear digital messages telling them the number they dialed is not in service or has been changed.

Signaling innovations represent ...

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