What is Telephone numbering plan?
A '''telephone numbering plan''' is a system used in [[telecommunications]] to give [[telephone number]]s to customers and to route telephone calls in a telephone [[network]]. A closed numbering plan imposes a fixed length to numbers, such as in [[North America]] (10-digit). An open numbering plan may have telephone numbers that vary in length. A '''dial plan''' establishes the type of telephone number in a given area. This includes [[country code]]s, access codes, [[area code]]s and all combinations of digits dialed. For instance, the North American public switched telephone network (PSTN) uses a phone numbers with a 3-digit '''area code''' and a 7-digit telephone number. {{stub}} [[Category:Telephone numbers]]