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Area Code
A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing. Telephone numbering plans are defined world-wide, as well as within each of the administrative regions of the public switched telephone network (PSTN), and in private telephone networks. In public numbering systems, geographic location typically plays a role in the sequence of numbers assigned to each telephone subscriber. Many numbering plan administrators subdivide their territory of service into geographic regions designated by a prefix, often called an area code or city code, which is a set of digits forming the most-significant part of the dialing sequence to reach a telephone subscriber. Within such regions designated by area codes, locally unique telephone number are assigned based on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American Numbering Plan
The North American Numbering Plan (NANP) is an integrated telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1, World Numbering Zone 1 and has the telephone country code, country code ''1''. Some North American countries, most notably Telephone numbers in Mexico, Mexico, do not participate in the NANP. The concepts of the NANP were devised originally during the 1940s by the American Telephone and Telegraph Company (AT&T) for the Bell System and the independent telephone companies in North America in Operator Toll Dialing. The first task was to unify the diverse local telephone numbering plans that had been established during the preceding decades, with the goal to speed call completion times and decrease the costs for long-distance calling, by reducing manual labor by switchboard operators. Eventually, it prepared the continent for direct-dialing of long-distance calls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numbering Scheme
There are many different numbering schemes for assigning nominal numbers to entities. These generally require an agreed set of rules, or a central coordinator. The schemes can be considered to be examples of a primary key of a database management system table, whose table definitions require a database design. In computability theory, the simplest numbering scheme is the assignment of natural numbers to a set of objects such as functions, rational numbers, graphs, or words in some formal language. A numbering can be used to transfer the idea of computability and related concepts, which are originally defined on the natural numbers using computable functions, to these different types of objects. A simple extension is to assign cardinal numbers to physical objects according to the choice of some base of reference and of measurement units for counting or measuring these objects within a given precision. In such case, numbering is a kind of classification, i.e. assigning a num ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephone Numbers In New Zealand
The New Zealand telephone numbering plan describes the allocation of telephone numbers in New Zealand and the Pitcairn Islands. History By the 1970s, New Zealand's telephone network consisted primarily of step-by-step telephone exchanges or, in the main centres, a mixture of rotary and step-by-step exchanges, with a few rural areas still served by manual exchanges. Local telephone number lengths varied from 3 to 6 digits depending on the size of exchange and population of the local calling area. Local numbers started with digits 2 through 8; numbers starting with 9 were not assigned due to easily being misdialed under pulse dialling, while 0 was for calling the operator and numbers beginning with 1 were for special services (e.g. emergency services on 111). Numerous complex dialling instructions appeared in the front of telephone books explaining the number sequences needed to reach subscribers in local "free calling" areas, and in a few cases for short-distance toll calls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local Number Portability
Local number portability (LNP) for fixed lines, and full mobile number portability (FMNP) for mobile phone lines, refers to the ability of a "customer of record" of an existing fixed-line or mobile telephone number assigned by a local exchange carrier (LEC) to reassign the number to another carrier ("service provider portability"), move it to another location ("geographic portability"), or change the type of service ("service portability"). In most cases, there are limitations to transferability with regards to geography, service area coverage, and technology. Location Portability and Service Portability are not consistently defined or deployed in the telecommunication industry. In the United States and Canada, mobile number portability is referred to as WNP or WLNP (Wireless LNP). In the rest of the world it is referred to as mobile number portability (MNP). Wireless number portability is available in some parts of Africa, Asia, Australia, Latin America and most European count ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overlay Complex
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 use since 1992, and has been the exclusive method of area code relief since 2007. History From the inception of the North American Numbering Plan in 1947 until 1992, the only method of introducing new area codes was the area code split. It divided an existing numbering plan area (NPA) into multiple regions, one of which retained the existing area code. The other parts were each assigned a new NPA code. The retaining area was usually the historically more established or developed place, and required no numbering changes. It gained numbering capacity by acquiring the central office codes of the other areas, because those were delegated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ten-digit Dialing
Ten-digit dialing is a telephone dialing procedure in the countries and territories of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when Dialling (telephony), dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk code ''1'', which is referred to as ''1+10-digit dialing'' or ''national format''. History The implementation and expansion of the North American Numbering Plan between 1947 and 1992 preserved a long-standing practice in the United States and Canada that callers should only need to dial the local seven-digit telephone number when placing a call within the caller's exchange area or within the home numbering plan area (NPA). In seven-digit dialing, callers dial the three-digit central office code and the four-digit station number of the destination telephone if it resides in the same numbering plan area. Dialing of an area code before the telephone number, ref ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subscriber Trunk Dialling
Subscriber trunk dialling (STD), also known as subscriber toll dialing, is a telephone numbering plan feature and telecommunications technology in the United Kingdom and various Commonwealth countries for the dialling of trunk calls by telephone subscribers without the assistance of switchboard operators. Switching systems to enable automatic dialling of long distance calls by subscribers were introduced in the United Kingdom on 5 December 1958. The system used area codes that were based on the letters in a town's name. A ceremonial first call was made by Queen Elizabeth II from Bristol to Edinburgh. A similar service, built on crossbar equipment, using regionally structured numbering, rather than alphanumeric codes, was experimentally introduced by P&T in Ireland in 1957, with the first services being in Athlone. A full service was rolled out in 1958, initially to exchanges in Cork and then Dublin and its hinterland, and gradually to all areas with automatic exchanges. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephone Numbers In Uruguay
Telephone numbers in Uruguay use the calling code +598. In 2010, national long distance calling was eliminated, and area codes were dropped. ANTEL (Spanish abbreviation for National Administration of Telecommunications) is Uruguay's state-owned company for telecommunications. History Original phone numbers had between 4 and 7 digits. To make a local phone call, those digits were all that were necessary. To make a call between two cities from different departments, required dialing zero, an area code, and the local number. On August 29, 2010, all phone numbers were changed 8 digits, according to the National Numbering Plan. Area codes were eliminated. This plan was implemented by URSEC (Spanish abbreviation for Regulator Unit of Services of Communications). National Numbering Plan Montevideo metropolitan area In the metropolitan area, national numbers begin with 2. This 8-digit number consists of the former area code (2), followed by the old 7-digit number. Examples ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephone Numbers In Denmark
Denmark generally uses an eight-digit closed telephone numbering plan. Subscriber numbers are portable with respect to provider and geography, i.e. fixed line numbers can be ported to any physical address in Denmark. The Kingdom of Denmark also includes two autonomous regions, the Faroe Islands and Greenland, although each has been assigned its own country calling code and has a separate numbering plan. Previously, the Faroe Islands also used the country code +45. Numbering Split charge is not generally used in Denmark anymore; calls to 70 numbers are usually charged as regular landline calls. In the latest published numbering plan, from 2016, there are exceptions to the landline series above. Almost all landline series have one or more exception based on their 3rd digit. Eg. 43-xx-xx-xx is designated as landline numbers, however 43-1x-xx-xx has been reassigned as a cellphone range. Special numbers * Emergency (Police, Fire, Ambulance): 112 * Police (non-emergency, nearest p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephone Numbers In The United Kingdom
In the United Kingdom and the Crown Dependencies, telephone numbers are administered by the Office of Communications (Ofcom). For this purpose, Ofcom established a telephone numbering plan, known as the ''National Telephone Numbering Plan'', which is the system for assigning telephone numbers to subscriber stations. Telephone numbers are of variable length. Local numbers are supported from landlines. Numbers can be dialled with a '0'-lead prefix that denotes either a geographical region or another service. Mobile phone numbers have distinct prefixes that are not geographic, and are portable between providers. Structure All mobile numbers, nearly all geographic numbers, and nearly all non-geographic numbers have ten national (significant) digits after the trunk code ''0''. The overall structure of the UK's National Numbering Plan is: A short sample of geographic numbers, set out in the officially approved (Ofcom) number groups: In the United Kingdom, the "area code" is o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telephone Numbers In Mexico
Telephone numbers in Mexico are regulated by the Federal Telecommunications Institute, an independent government agency of Mexico. The agency published the ''Fundamental Technical Plan for Numbering'' (''Plan Técnico Fundamental de Numeración'') on May 11, 2013. The plan establishes a uniform ten-digit telephone number format. It took effect on August 3, 2019. Telephone number format All telephone numbers in Mexico have ten digits, of which the first identifies one of the eight principal geographic regions of the country. The national number is formed by prefixing the previously existing local number format with an area code. All ten digits must be dialed for all calls. Dialing prefixes Since August 3, 2019, only the following dialing prefixes are available for use within Mexico: Dialing into Mexico Destinations in Mexico are dialed from foreign location by dialing the foreign country's International access code (''011'' within the NANP area, ''00'' in many other coun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
