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A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC).
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 .
In telecommunications, an area code overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are implemented in territories of the North American Numbering Plan (NANP) to mitigate exhaustion of central office codes in growth areas. The method has been in ...
Area code Year Current region 212: 1947 New York City: Manhattan only; overlays with 332, 646, and 917 315: 1947 Syracuse, Utica, Watertown, and north central New York; overlaid by 680. 329: 2023: Poughkeepsie, Middletown, Newburgh, West Point, Goshen and southeastern New York; overlay of 845 332: 2017
A similar step had been taken a year earlier in British Columbia, when area code 778 was converted into an overlay complex for the entire province. On April 9, 2016, the province was overlaid with an additional area code, 825. [6] As of January 21, 2022, the province is additionally overlaid with area code 368. [7] [8] Area code 568 is reserved ...
The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south ...
As a result, in the early 1990s, the North American Numbering Plan Administrator (NANPA) introduced another method for exhaustion relief: the area code overlay. This method assigns multiple area codes to the same numbering plan area, so that existing subscribers can keep established telephone numbers. Only new accounts and extra lines receive ...
The new area code was one of the first area codes not serving an entire state, but having the digit 0 in the middle position of the code. It was the only new area code created in Illinois between 1947 and the 1989 creation of area code 708. [2] In preparation of an overlay plan with the new area code 779, all calls from the 815 area needed to ...
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