- Dial plan
A dial plan establishes the expected number and pattern of digits for a
telephone number. This includes country codes, access codes, area codes and all combinations of digits dialed. For instance, the North American public switched telephone network( PSTN) uses a 10-digit dial plan that includes a 3-digit area code and a 7-digit telephone number. Most PBXs support variable-length dial plans that use 3 to 11 digits. Dial plans must comply with the telephone networks to which they connect.
In the U.S., some typical dial plans include:
*Internal extension numbers of two, three, or four digits.
*Local numbers of seven or ten digits, which may be preceded by a 9 if required to access an outside line.
*Long distance numbers of eleven digits, consisting of a 1, then a three-digit area code, then a seven-digit number; preceded by a 9 if required.
*International numbers of any length starting with 011 and preceded by a 9 if required.
The following syntax used to identify a "dial plan" in a digit map is adapted from [RFC 2705] .
Some "dial plan" examples using the above syntax look as follows:
Uniform dialing plan
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