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A telephone numbering plan is a system of allocating and routing telephone numbers in a telephone network. A closed numbering plan, such as found in North America, features fixed length area codes and local numbers. An open numbering plan features variance in length of area code or local number, or both. The term dial plan should not be confused with numbering plan.
Posted by waqasahmad
NPA. Usually corresponds to the area code in additional POTS-PSTN telephone numbering system.
Posted by tyson
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