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NPA code
(redirected from North American Numbering Plan)

   Also found in: Acronyms, Wikipedia 0.01 sec.
NPA code
(Numbering Plan Area code) The area code of a telephone number in the NPA system. The first NPA codes used 0 or 1 as the center digit, such as 201, 212, 301, 312, etc., designated as "N0/1X." After July 1, 1995, all digits 0 through 9 are valid as the center digit, designated as "NXX." See NPA and NPA/Nxx.


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That's according to the North American Numbering Plan Administration, the national authority that tracks area codes and warns local utilities when numbers are running low.
0 introduces capabilities designed for customers with switches located outside the North American Numbering Plan (NANP) and includes more than 130,000 global city and country codes and multi-currency call detail record (CDR) rating.
But while 747 is not a currently used area code in the US, SIPphone's use of it has not been officially recognized by the administrators of the North American numbering plan, but rather been picked arbitrarily for its mnemonic value.
 
 
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