Somos, Inc. Is Awarded the North American Numbering Plan Administration and the Pooling Administration Contracts | Somos". Some carrier-specific services have used area code 700. In Canada, area code 600 is used for non-geographic applications. Area code 900 has been used for high-toll 900 numbers. xxxx — Carrier access code for selecting an alternative long-distance carrier; xxxx is the carrier identification code (CIC). 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’.

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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. As the numbering plan grew in the 1960s under all-number calling, plan administrators at AT&T identified that by c. 1973 some of the largest area codes in urban centers might run out of central office prefixes to install more individual access lines. For relief in these cases, they finally removed the requirement that the middle digit of the central office code could not be 0 or 1. This resulted in the format of interchangeable central office codes, N X X, where N= 2–9 and X= 0–9. The first cities that required this action, in 1974, were the cities of Los Angeles with area code 213 and New York with 212. This change also required modification of the local dialing procedures to distinguish local calls from long-distance calls with area codes. Since the entire features of this free XNX Video Player app are available for free, there is no harm giving it a try and explore the features for yourself. Just open the video file you wish to watch and leave the rest to this powerful video player.

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Each three-digit area code has a capacity of 7,919,900 telephone numbers (7,918,900 in the United States). 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]

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The initial plan for area code overlays did allow for providing separate area codes for use by mobile devices, although these were still assigned to a specific geographical area, and were charged at the same rate as other area codes. Initially, the area code 917 for New York City was specifically assigned for this purpose within the boroughs; however, a Federal court overturned the practice and the use of an area code for a specific telephony purpose. [ citation needed] Since mobile telephony has been expanding faster than landline use, new area codes typically have a disproportionately large fraction of mobile and nomadic numbers, although landline and other services rapidly follow and local network portability can blur these distinctions. 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 North American Numbering Plan does not set aside special non-geographic area codes exclusively for cellular phones, as is customary in some other national telephone administrations. Only one regional exception exists in area code 600 in Canada. For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11. 314 159-2653 is invalid, because the office code must not begin with 1. 123 234-5678 is invalid, because the NPA must not begin with 0 or 1. [36] [37] [38] [39] 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.

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Alliance for Telecommunications Industry Solutions (ATIS), Numbering and Dialing Plans within the United States (ATIS-0300076), December 2008, p.7

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NANPA: North American Numbering Plan Administration - About Us". Archived from the original on 2012-06-04 . Retrieved 2011-11-05. 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 Mapquest will generate a map show the approximate Central Office location if you invoke it with a URL like this: The number of digits dialed is unrelated to being a local call or a toll call when there is no toll alerting. Allowing 7D local dial across an area code boundary, which is uncommon today, requires central office code protection, locally if using toll alerting, across the entire area code otherwise, to avoid assignment of the same seven-digit number on both sides. Landlines occasionally require 1+10D where 10D is required, most notably in California. The original plan of 1947 had been projected to be usable beyond the year 2000. However, by the late 1950s it became apparent that it would be outgrown by about 1975. [34] The limitations for the usable leading digits of central office codes, imposed by using common names for central office names, and their leading two characters as guides for customer dialing could no longer be maintained when opening new central offices. By 1962 it was forecast that in 1985 the number of telephones in the nation would equal its population of 280million and increase to 600million telephones for 340million people in 2000. [30] As a result, a few North American telephone administrations, notably New York Telephone Co., first introduced letter combinations that could not be linked to a familiar pronounceable central office name. Finally, they sought the elimination of central office names and letter codes, and introduced all-number calling (ANC).Rate Center Consolidations" (PDF). Archived from the original (PDF) on 2015-01-18 . Retrieved 2015-01-18. The Dutch Caribbean territory of Sint Maarten joined the NANP in September 2011, receiving area code 721. [13] Sint Maarten shares the island with the French Collectivity of Saint Martin which, like the rest of the French Caribbean, is not part of the NANP.

The North American Numbering Plan (NANP) - VoIP-Info

In October 1947, AT&T published a new nationwide numbering plan in coordination with the independent telephone operators. The plan divided most of North America into eighty-six numbering plan areas (NPAs). Each NPA was assigned a unique three-digit code, typically called NPA code or simply area code. These codes were first used in Operator Toll Dialing by long-distance operators in establishing calls via trunks between toll offices. The goal of automatic service required additional technical advancements in the latest generation of toll-switching systems, completed by the early 1950s, and installation of new toll-switching systems in most numbering plan areas. The first customer-dialed direct call using an area code was made on November 10, 1951, from Englewood, New Jersey, to Alameda, California. [6] Direct distance dialing (DDD) was subsequently introduced across the country. By the early 1960s, DDD had become commonplace in cities and most towns in the United States and Canada. By 1967, the number of assigned area codes had grown to 129. [7] Requiring 1 to be dialed before the full number in some areas provided for area codes of the form N10, such as 210 in the San Antonio, Texas, area and 410 in eastern Maryland. Therefore, someone calling from San Jose, California, to Los Angeles before the change would have dialed 213-555-0123 and after the change 1-213-555-0123, which permitted the use of 213 as an exchange prefix in the San Jose area. The preceding 1 also ideally indicates a toll call; however, this is inconsistent across the NANP because the FCC has left it to the U.S. state public utilities commissions to regulate for traditional landlines, and it has since become moot for mobile phones and digital VoIP services that now offer nationwide calling without the extra digit. [ citation needed] Interchangeable NPA codes [ edit ] Splitting numbering plan areas instead of overlaying generally avoids the requirement for mandatory area code dialing within the new regions, but at the expense of having to convert a region to the new code, which necessitates updating records and directories to accommodate the new numbers. A transition period prior to splitting provides a period of "permissive dialing" during which seven-digit dialing is still permitted. Also, many splits involved significant technical issues, considering municipal boundaries and tributary trunking arrangements. 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 use of telephone exchange names as part of telephone numbers had been a well-established practice, and this was preserved for convenience and expediency in the new network design. The letter-to-digit translations were printed on the face of every rotary dial in the metropolitan areas, according to a scheme designed by W.G. Blauvelt in 1917, that had been used in the Bell System in large metropolitan areas since the early 1920s. [29] The network reorganization standardized this system to using a two-letter, five-digit ( 2L-5N) representation of telephone numbers in most exchanges in North America, [30] or to using an equivalent all-numeric seven-digit numbering plans, as was practiced by some telephone companies.and 1157 — used to trace harassing, threatening, abusive, obscene, etc. phone calls, and keep results of trace at phone company 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. For system-wide toll-free calling, in which the receiving party is billed for the call, uses the number range with area codes of the form 8XX.