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A telephone numbering plan is a type of used in to assign 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 in each of administrative regions of the PSTN and they are also present in private telephone networks.
For public number systems, geographic location plays a role in the sequence of numbers assigned to each telephone subscriber.
Numbering plans may follow a variety of design strategies which have often arisen from the historical evolution of individual telephone networks and local requirements.
A broad division is commonly recognized, distinguishing open numbering plans and closed numbering plans.
The ITU has established a comprehensive numbering plan, designatedfor uniform interoperability of the networks of its member state or regional administrations.
It is an all area codes us numbering plan, however, imposing a maximum length of 15 digits to telephone numbers.
The standard defines a country code for each state or region which is prefixed to each national numbering plan telephone number for international destination routing.
Private numbering plans exist in telephone networks that are privately operated in an enterprise or organizational campus.
Such systems may be supported by a private branch exchange PBXwhich provides a central access point to the PSTN and also controls internal calls between telephone extensions.
In contrast to numbering plans, which determine telephone numbers assigned all area codes us subscriber stations, establish the customer dialing procedures, i.
Even in closed numbering plans, it is not always necessary to dial all digits of a number.
For example, an area code may often be omitted when the destination is in the same area as the calling station.
National telephone numbers are defined by national or regional numbering plans, such as thethe NANPor the.
Within the national numbering plan, a complete destination telephone number is composed of an area code and a subscriber telephone number.
The subscriber number is the number https://money-slots-spin.website/all/all-starcraft-2-cheat-codes.html to a line connected to customer equipment.
The first few digits of the subscriber number may indicate smaller geographical areas or individual.
In mobile networks they may indicate the network provider.
Callers in a given area or country sometimes do not need to include the particular area prefixes when dialing within the same area.
Devices that dial telephone numbers automatically may include the full number with area and access codes.
Country code are necessary only when dialing telephone numbers in other countries than the originating telephone.
These are dialed before the national telephone number.
By convention, international telephone numbers are indicated in listings by prefixing the country code with a plus sign +.
This reminds the subscriber to dial the in the country from which the call is placed.
For example, the international dialing prefix or access code in all NANP countries is 011, while it is 00 in most European countries.
In some networks, it may be possible to dial +, which may be recognized automatically by the network carrier in place of the international access code.
Area code Many telephone numbering plans are structured based on divisions codes bakery tycoon all geographic areas of the service territory.
Each area identified in the plan is assigned a numeric routing code.
This concept was first developed for of the Bell System in the early 1940s, which preceded the of 1947.
The North American Numbering Plan NANP divided the North American service territories into Go hereand assigned to each NPA a unique numerical prefix, the numbering plan area code, which became known in short-form as area code.
The area code all area codes us prefixed to each telephone number issued in its service area.
National telecommunication authorities use various formats and dialing rules for area codes.
The size of area code prefixes may either be fixed or variable.
Area codes all area codes us the NANP have three digits, while two digits are used inone digit in and.
Variable-length formats exist in multiple countries including:1 to 4https://money-slots-spin.website/all/all-nairabet-code.html to 5 digits1 to 52 or 3 digits1 or 21 or 2 and the.
In addition to digit count, the format may be restricted to certain digit patterns.
For example, the NANP had at times specific restrictions on the range of digits for the three positions, and required assignment to geographical areas avoiding nearby areas receiving similar area codes to avoid confusion and misdialing.
Some countries, such ashave merged variable-length area codes and telephone numbers into fixed-length numbers that must always be dialed independently of location.
In such administrations, the area code is not distinguished formally in the telephone number.
In the UK, area codes were first known as STD codes.
Depending on local dialing plans, they are often necessary only when dialed from outside the code area or from mobile phones.
In North America ten-digit dialing is required in areas with.
The strict correlation of a telephone to a geographical area has been broken by technical advances, such as and service.
When dialing a telephone number, the area code may be preceded by a national access codethe international access code and country code.
Area codes are often quoted by including the national access code.
For example, a number in may be listed as 020 7946 0321.
Users must correctly interpret 020 as the code for London.
If they call from another station within London, they may merely dial 7946 0321, or if dialing from another country, the initial 0 should be omitted after the country code.
Subscriber dialing procedures A establishes the expected sequence of digits dialed on subscriber premises equipment, such as telephones, in private branch exchange PBX systems, or in other telephone switches to effect access to the telephone networks for the routing of telephone calls, or to effect or activate specific service features by the local telephone company, such as 311 or 411 service.
A variety of dial plans may exist within a numbering plan and these often depend on the network architecture of the local telephone operating company.
Variable-length dialing Within the North American Numbering Plan NANPthe administration defines standard and permissive dialing plans, specifying the number of mandatory digits to be dialed for local all area codes us within the area code, as well as alternate, optional sequences, such as adding the prefix 1 before the telephone number.
Despite the closed numbering plan in the NANP, different dialing procedures exist in many of the territories for local and long distance telephone calls.
This means that to call another number within the same city or area, callers need to dial only a subset of the full telephone number.
For example, in the NANP, only the 7-digit number may need to be dialed, but for calls outside the local numbering plan area, the full number including the area code is required.
In these situations, Recommendation suggests to list the area code in parentheses, signifying that in some cases the area code is optional or may not be required.
Internationally, an area code is typically prefixed by a domestic trunk access code usually 0 when dialing from inside a country, but is not necessary when calling from other countries; there are exceptions, such as for.
Some phones, especially mobile telephones, allow the + to be entered directly.
mobile codes other devices the user must replace the + with the for their current location.
While most nations require the area code to be dialed only if it is different, in New Zealand, one needs to dial the area code if the phone is outside the local calling area.
For example, the town of is in the City Council jurisdiction, and has phone numbers 03 465 7xxx.
To call the city council in central Dunedin 03 477 4000, residents must dial the number in full including the area code even though the area code is the same, as Waikouaiti and Dunedin lie in different local calling areas and Dunedin, respectively.
In the, and other countries or territories using the NANPthe international trunk access code is 1, which is also the.
The same rule also applies in many parts of the NANP, including all areas of Canada that still have variable-length dial plan.
This is not universal, as there are locations within the United States that allow long distance calls within the same area code to be dialed as seven digits.
In Canada, the domestic trunk code long distance access code must also be dialed along with the area code for long distance calls even within the same area code.
money cheat for all games from mobile phones is different in the U.
Most mobile phones can be configured to automatically add a frequently called area code as a prefix, allowing calls within the desired area to be dialed by the user as seven-digit numbers, though sent by the phone as ten-digit numbers.
In some parts of the United States, especially northeastern states such as served bythe ten-digit number must be dialed.
If the call is not local, the call fails unless the dialed number is preceded by digit 1.
Area code is required; one of two completion options for mobile phones within the U.
In California and New York, because of the existence of both overlay area codes where an area code must be dialed for every call and non-overlay area codes where an area code go here dialed only for calls outside the subscriber's home area code"permissive home area code dialing" of 1 + the area code within the same area code, even if no area code is required, has been permitted since the mid-2000s.
For example, in the 559 area code a non-overlay area codecalls may be dialed as 7 digits XXX-XXXX or 1-559 + 7 digits.
The manner in which a call is dialed does not affect the billing of the call.
This "permissive home area code dialing" helps maintain uniformity and eliminates confusion given the different types of area code relief that has made California the nation's most "area code" intensive State.
Unlike other states with overlay area codes Texas, Maryland, Florida and Pennsylvania and othersthe California Public Utilities Commission and the New York State Public Service Commission maintain two different dial plans: Landlines must dial 1 + area code whenever an Area Code is part of the dialed digits while cellphone users can omit the "1" and just dial 10 digits.
Many organizations have systems which permit dialing the access digit s for an outside line usually 9 or 8a "1" and finally the local area code and xxx xxxx in areas without overlays.
This aspect is unintentionally helpful for employees who reside in one area code and work in an area go here with one, two, or three adjacent area codes.
Full-number dialing In small countries or areas, the full telephone number is used for all calls, even in the same area.
This has traditionally been the case in small countries and territories where all area codes us codes have not been required.
However, there has been a trend in many countries towards making all numbers a standard length, and incorporating the area code into the subscriber's number.
This usually makes the use of a trunk code obsolete.
Country codes are prefixes to national telephone numbers that denote call routing to the network of a subordinate number plan administration, typically a country, or group of countries with a uniform numbering plan, such as the NANP.
Within the system of country calling codes, the ITU has defined interesting all unlock codes for nokia question prefixes for special services and assigns such codes for independent international networks, such as satellite systems, spanning beyond the scope of regional authorities.
Satellite telephone systems are usually issued with numbers with a special country calling code.
For example, satellite phones are issued with code +870, while providers, such asissue numbers in country code +881 "Global Mobile Satellite System" or +882 "International Networks".
Some satellite phones are issued with ordinary phone numbers, such as satellite phones issued with NANP telephone numbers.
NPIs can be found in SCCP and SMS messages.
Such networks operate a private switching system or a PBX within the network.
The internal numbers assigned are often called extension numbers, as the internal numbering plan extends an official, published main access number for the entire network.
A caller from within the network only dials the extension number assigned to another internal destination telephone.
A private numbering plan provides the convenience all orb 2 codes mapping station telephone numbers to other commonly used numbering schemes in an enterprise.
For example, station numbers may be assigned as the room number of a hotel or hospital.
Station numbers may also be strategically mapped to certain keywords composed from the letters on the telephone dial, such as 4357 help to reach a.
The internal number assignments may be independent of any DID services provided by external telecommunication vendors.
For numbers without DID access, the internal switch relays externally originated calls via an operator, an or an electronic system.
Telephone numbers for users within such systems are often published by suffixing the official telephone number with the extension number, e.
Some systems may automatically map a large block of DID numbers differing only in a trailing sequence of digits to a corresponding block of individual internal stations, allowing each of them to be reached directly from the.
In some of these cases, a all area codes us shorter dial-in number can be used to reach an operator who can be asked for general information, e.
For example, individual extensions at can be dialed directly from outside via their four-digit internal extension +49-681-302-xxxx, whereas the university's official main number is +49-681-302-0 49 is the country code for681 is the area code for302 the prefix for the university.
Callers within a private numbering plan often dial a trunk prefix to reach a national or international destination outside line or to access a or tie-line to another location within the same enterprise.
A large manufacturer with factories and offices in multiple cities may use a prefix such as '8' followed by an internal routing code to indicate a city or location, then an individual four- or five-digit extension number at the destination site.
A common trunk prefix for an outside line on North American systems is the digit 9, followed by the outside destination number.
Additional customisations, such as single-digit access to a front desk or from an individual room, are available at the sole discretion of the PBX owner.
Ryan, Operator Toll Dialing—A New Long Distance Method, Bell Telephone Magazine, Volume 24, p.
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