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An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers.
北米電話番号計画 （ほくべい でんわばんごう けいかく、 英 ：North American Numbering Plan, NANP）は、 アメリカ合衆国 とその海外領土、 カナダ 、 西インド諸島 の国々やイギリス海外領土などを対象とした国際電話番号の 電話番号計画 。. 1-に続く3桁の国番号 ...
Telephone number pooling. Telephone number pooling, thousands-block number pooling, or just number pooling, is a method of allocating telephony numbering space of the North American Numbering Plan in the United States. The method allocates telephone numbers in blocks of 1,000 consecutive numbers of a given central office code to telephony ...
The North American Numbering Council (NANC) is a Federal Advisory Committee that was created to advise the Commission on numbering issues and to make recommendations that foster efficient and impartial number administration. 2015 Charter Renewal NANC Charter Renewed, Nominations for NANC Membership Requested Public Notice: Word | Acrobat | Text 2015 NANC Meeting Dates Thursday, March 5, 2015 ...
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes
North America United States, Canada, and other NANP countries. Twenty-four countries and territories share the North American Numbering Plan (NANP), with a single country code, 1. The formatting convention for telephone numbers is (NPA) NXX-XXXX, where NPA is the three-digit area code, and NXX-XXXX is the seven-digit subscriber number.
AT&T developed the North American Numbering Plan in 1947 to simplify and facilitate direct dialing of long distance calls. Implementation of the plan began in 1951. The International Telecommunications Union (ITU) assigned country code "1" to the NANP area. The NANP conforms with ITU Recommendation E.164, the international standard for ...
