In telecommunication, a dial plan (or dialing plan) establishes the permitted sequences of digits dialed by telephone subscriber and the manner in which a telephone switch interprets these digits within the definitions of the prevailing telephone numbering plan.[1] Dial plans in the public switched telephone network 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.
- ^ John G. van Bosse, Fabrizio U. Devetak, Signaling in Telecommunication Networks, ISBN 978-0-471-66288-4, John Wiley & Sons (2007), p.71
- ^ AT&T, Notes on Distance Dialing