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The country code for all countries participating in the NANP is 1. The prefix digit 1 is also used within the NANP for long-distance dialing. ITU; ITU-T. "The International Public Telecommunication Numbering Plan". ITU . Retrieved 2015-07-25. The four-digit numbers are not implemented in some areas. The star codes (*) are for use on Touch-Tone telephones, whereas the four-digit numbers prefixed 11xx are used on rotary dial telephones which cannot dial the * symbol. The NANP is administered by the North American Numbering Plan Administrator (NANPA, formerly Administration). [14] This function is overseen by the Federal Communications Commission, which assumed the responsibility upon the breakup of the Bell System. The FCC solicits private sector contracts for the role of the administrator. The Eastern Caribbean Telecommunications Authority (ECTEL) > Telecom regulations". Archived from the original on 2011-07-18 . Retrieved 2009-03-13.

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IDDD was implemented through extensive modifications in the switching systems to accommodate the international open numbering plan with seven to twelve digits in the national telephone numbers. [49] Access to the international network is facilitated by the dialing prefix 011, after which the country code and the national telephone number are dialed. The status of the network of the 1960s was reflected in a new name used in technical documentation: North American Integrated Network. [7] By 1975, the numbering plan was referred to as the North American Numbering Plan, [8] leading to the well-known acronym NANP, as other countries sought or considered joining in the standardization. Alliance for Telecommunications Industry Solutions (ATIS), Numbering and Dialing Plans within the United States (ATIS-0300076), December 2008, p.7 The structure of the North American Numbering Plan permits implementation of local dial plans in each plan area, depending on requirements. When multiple NPA codes serve an area in an overlay arrangement, ten-digit (10D) dialing is required. Seven-digit (7D) dialing may be permissible in areas with single area codes. [45] Depending on the requirement of toll alerting, it may be necessary to prefix a telephone number with 1. The NANPA publishes dial plan information for individual area codes. [46] Membership in the NANP brings significant advantages for countries in the vicinity of the United States and Canada, which usually are already the top dialing destinations. Both countries also originate most of the tourism business for the Caribbean. This is enhanced by the integration from sharing the same dialing procedures, without international access codes, and the toll-free number system of the NANP, as businesses in all member countries are eligible to participate.Osborne, H. S. (1930-07-01). "A General Switching Plan for Telephone Toll Service". Bell System Technical Journal. 9 (3): 429 . Retrieved 2023-07-11.

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All-number calling was a telephone numbering plan introduced in 1958, [33] that converted telephone numbers with exchange names to a numeric representation of seven digits. Most area codes of the form N10, originally reserved for AT&T's Teletypewriter eXchange (TWX) service, were transferred to Western Union in 1969 and were freed up for other use in 1981 after conversion to Telex II service was complete. The last of these, 610, was assigned to Canada, but reassigned in 1992. These new area codes, as well as a few other codes used for routing calls to Mexico, were used for telephone area code splits in the late 1980s and early 1990s, as all other area codes under the original plan had been consumed. Under all-number calling, the number of permissible central office prefixes increased from 540 to potentially 800, but the first two digits of the central office code were still restricted to the range 2 to 9, and the eight combinations that ended in 11 were reserved as special calling codes. [30] This increased the numbering pool for central office codes to 640, and resulted in the partitioning of the prefix space ( 000— 999). [32] Interchangeable central office codes [ edit ] The FCC directed the North American Numbering Council (NANC) to select one or more private-sector candidates for the local number portability administrator (LNPA) function, [52] in a manner akin to the selection of the North American Numbering Plan Administrator (NANPA). [53] NANPA: Number Resources - NPA (Area) Codes". Archived from the original on 2015-10-09 . Retrieved 2015-10-23.

This section needs additional citations for verification. Please help improve this article by adding citations to reliable sourcesin this section. Unsourced material may be challenged and removed. ( February 2014) ( Learn how and when to remove this template message) The NANP numbering format may be summarized in the ten-digit notation NXX NXX-XXXX, where N denotes any of the digits 2–9, and X denotes any digit 0–9.

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At the request of the British Colonial Office, the numbering plan was first expanded to Bermuda and the British West Indies because of their historic telecommunications administration through Canada as parts of the British Empire and their continued associations with Canada, especially during the years of the telegraph and the All Red Line system. a b c "PL-418: Introduction of NPA 721 (Sint Maarten)" (PDF). North American Numbering Plan Administration. 2011-01-05. Archived from the original (PDF) on 2012-09-07 . Retrieved 2011-08-08. Updated by: "PL-423: Updated Information - Introduction of NPA 721 (Sint Maarten)" (PDF). North American Numbering Plan Administration. 2011-07-27. Archived (PDF) from the original on 2019-01-08 . Retrieved 2011-08-08. The eight codes of the form N11 ( N=2–9) were reserved as service codes. The easily recognizable codes of the form N00 were available in the numbering plan, but were not initially included in assignments. [7] Additional area code patterns were later assigned for other services; for example, the area codes N10 were implemented for the Teletypewriter Exchange Service (TWX). [28] Central office codes [ edit ] Bell Telephone Laboratories, A History of Engineering and Science in the Bell System - The Early Years (1875-1925), M.D. Fagan (ed.), 1975, p.126 The North American Numbering Plan (NANP) governs the management of telephone numbers for the Public Switched Telephone Networks in North America (Canada, USA, Carribean, and territories) within the international country code prefix ‘+1’.Operator Toll Dialing required a nationwide telephone numbering plan that unified all local numbering plans into a consistent universal system. Local numbering plans, many of which required only four or five digits to be dialed, or even fewer in small communities, needed to be expanded. but the goal was to enable local telephone companies to make as few changes as possible in their systems.

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Mapquest will generate a map show the approximate Central Office location if you invoke it with a URL like this:Using the global formatting for telephone numbers, per recommendation E.164 by the International Telecommunication Union (ITU), a NANP number is written as +1NPANXXXXXX, without spaces or punctuation, e.g. +12505550199. The plus-sign indicated that the user may have to dial another prefix per local dialing conventions in the country of origin that selects a trunk for international network access; the digits immediately following are thus the country code, where 1 is the NANP country code. In 1947, AT&T completed the new design for a nationwide toll network that established the original North American area codes. The new numbering plan provided for 152 area codes, each with a capacity to serve up to 540 central offices. [26] Originally, only eighty-six area codes were assigned. New Jersey received the first NPA code in the new system, area code 201. [27] The second area code, 202, was assigned to the District of Columbia. The allocation of area codes was readjusted as early as 1948 to account for inadequacies in some metropolitan areas. For example, the Indiana numbering plan area 317 was divided to provide a larger numbering pool in the Indiana suburbs of Chicago ( area code 219).