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Map of LATAs in the US. Local access and transport area (LATA) is a term used in U.S. telecommunications regulation.It represents a geographical area of the United States under the terms of the Modification of Final Judgment (MFJ) entered by the United States District Court for the District of Columbia in Civil Action number 82-0192 or any other geographic area designated as a LATA in the ...
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
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.
411 and 611 are supported by the service provider for the calling phone, but not all carriers provide these services. 411 and 611 (formerly 811) are typically blocked within enterprise or private branch exchange (PBX) systems, including cellular telephone service purchased for an enterprise system, since 411 calls generally incur a fee and the ...
Telephone number mapping systems provide facilities to determine applicable Internet communications servers responsible for servicing a given telephone number using DNS queries. The most prominent facility for telephone number mapping is the E.164 number to URI mapping ( ENUM ) standard.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as country dial-in codes, or historically international subscriber dialing (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
An indoor location tracking map on a mobile phone. Mobile phone tracking is a process for identifying the location of a mobile phone, whether stationary or moving. . Localization may be affected by a number of technologies, such as the multilateration of radio signals between (several) cell towers of the network and the phone or by simply
Qwest Corporation, doing business as CenturyLink QC, is a Regional Bell Operating Company owned by Lumen Technologies.It was originally named Mountain States Telephone and Telegraph Company, later becoming known as Mountain Bell, then US West Communications, Inc. from 1991 to 2000.