Dial plan

A dial plan (or dialing plan) establishes the permitted sequences of digits dialed on subscriber lines or on subscriber premises equipment, such as telephones and private branch exchange (PBX) systems.[1] Dial plans in the public switch telephone network (PSTN) have traditionally been more commonly referred to as dialing procedures.[2]

The collection of permissible digit patterns, so called digit-maps, for a private telephone system or for customer premise equipment, such as an analog telephone adapter (ATA) or an IP phone, is sometimes also called dial plan. A pattern may be as short as a single digit, e.g. for reaching an operator, or as long as a complete international telephone number, including trunk prefixes and international prefixes.

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