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IP Telephony Using CallManager Express Lab Portfolio by Ernie Friend, Cheryl A. Schmidt

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Chapter 4.Dial Plans and Dial Peers

A dial plan allows people to call each other by dialing a number on the telephone. Dial plans include access codes, area codes, and specialized codes. The North American Public Switched Telephone Network (PSTN) uses a ten-digit dial plan that includes a three-digit area code and a seven-digit telephone number (that is, 904-555-4568). Most private branch exchanges (PBXs) support variable-length dial plans that use 3 to 11 digits. Dial plans must comply with the telephone networks to which they connect. Dial plans are similar to IP addressing in that only totally private voice networks that are not linked to the PSTN or to other PBXs can use any dial plan they choose.

Dial peers are used to configure ...

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