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E.164 is an ITU-T
ITU-T

The Telecommunication Standardization Sector coordinates standards for telecommunications on behalf of the International Telecommunication Union and is based in Geneva, Switzerland....
 recommendation which defines the international public telecommunication numbering plan
Numbering plan

A numbering plan is a type of numbering scheme used in telecommunications. This is a set of rules used for making numbers. For example, most telephone numbers belong to the E.164 numbering plan, though that won't include internal extensions in some PABXs....
 used in the PSTN and some other data networks
Telecommunications network

A telecommunications network is a wiktionary:Network of telecommunications links and nodes arranged so that messages may be passed from one part of the network to another over multiple links and through various nodes....
. It also defines the format of telephone number
Telephone number

A telephone number or phone number is a sequence of numbers used to call from one telephone line to another in a telephone network. When telephone numbers were invented, they were short - as few as two or three digits - and were used by people to call a few neighbors....
s. E.164 numbers can have a maximum of fifteen digits and are usually written with a + prefix. To actually dial such numbers from a normal fixed line phone, the appropriate international call prefix must be used.

The title of the original and revision 1 was "Numbering Plan for the ISDN
Integrated Services Digital Network

File:T-Concept-ISDN.jpgIntegrated Services Digital Network is a telephone system network. Prior to the ISDN, the phone system was viewed as a way to transport voice, with some special services available for data....
 Era".

recommendation provides the number structure and functionality for the three categories of numbers used for international public telecommunication
Telecommunication

Telecommunication is the assisted Transmission of Signal over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, Drum , Semaphore line, flag signals or heliograph....
:

For each of the categories, it details the components of the numbering structure and the digit analysis required to successfully route
Routing

Routing is the process of selecting paths in a network along which to send network traffic. Routing is performed for many kinds of networks, including the PSTN, Computer network , and transport network....
 the calls.






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Encyclopedia


E.164 is an ITU-T
ITU-T

The Telecommunication Standardization Sector coordinates standards for telecommunications on behalf of the International Telecommunication Union and is based in Geneva, Switzerland....
 recommendation which defines the international public telecommunication numbering plan
Numbering plan

A numbering plan is a type of numbering scheme used in telecommunications. This is a set of rules used for making numbers. For example, most telephone numbers belong to the E.164 numbering plan, though that won't include internal extensions in some PABXs....
 used in the PSTN and some other data networks
Telecommunications network

A telecommunications network is a wiktionary:Network of telecommunications links and nodes arranged so that messages may be passed from one part of the network to another over multiple links and through various nodes....
. It also defines the format of telephone number
Telephone number

A telephone number or phone number is a sequence of numbers used to call from one telephone line to another in a telephone network. When telephone numbers were invented, they were short - as few as two or three digits - and were used by people to call a few neighbors....
s. E.164 numbers can have a maximum of fifteen digits and are usually written with a + prefix. To actually dial such numbers from a normal fixed line phone, the appropriate international call prefix must be used.

The title of the original and revision 1 was "Numbering Plan for the ISDN
Integrated Services Digital Network

File:T-Concept-ISDN.jpgIntegrated Services Digital Network is a telephone system network. Prior to the ISDN, the phone system was viewed as a way to transport voice, with some special services available for data....
 Era".

Categories

This recommendation provides the number structure and functionality for the three categories of numbers used for international public telecommunication
Telecommunication

Telecommunication is the assisted Transmission of Signal over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, Drum , Semaphore line, flag signals or heliograph....
:

For each of the categories, it details the components of the numbering structure and the digit analysis required to successfully route
Routing

Routing is the process of selecting paths in a network along which to send network traffic. Routing is performed for many kinds of networks, including the PSTN, Computer network , and transport network....
 the calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides information on network identification
Identification

Identification or Identify may refer to:* Identification , the process of assigning a pre-existing individual or class name to an individual organism...
, service parameter
Parameter

In mathematics, statistics, and the mathematical sciences, a parameter is a quantity that defines certain characteristics of systems or function s....
s, calling/connected line identity, dialling procedures, and addressing for Geographic-based ISDN calls. Specific E.164-based applications which differ in usage are defined in separate recommendations.

The number categories are all based on a fifteen-digit numbering space (excluding prefixes; before 1997, only twelve digits were allowed). They are as follows:

Number structure for geographic area

Country Code National Destination Code (optional) Subscriber Number
National (significant) number
cc = 1 to 3 digits maximum = 15 - cc digits
International public telecommunication number for geographic areas (maximum 15 digits)


Number structure for global services

Country Code Global Subscriber Number
cc = 3 digits maximum = 15 - cc digits
International public telecommunication number for global services (maximum 15 digits)


Number structure for networks

Country Code Identification Code Subscriber Number
cc = 3 digits x = 1 to 4 digits maximum = 15 - (cc + x) digits
International public telecommunication number for networks (maximum 15 digits)


Number structure for groups of countries

Country Code Group Identification Code Subscriber Number
cc = 3 digits gic = 1 digit maximum = 15 - (cc + gic) = 11 digits
International public telecommunication number for groups of countries (maximum 15 digits)


Recommendations contained in E.164


E.164.1

This recommendation describes the procedures and criteria
Criterion

Criterion may refer to:In science and mathematics:*Criterion validity, in psychometrics, a measure of how well one variable or set of variables predicts an outcome...
 for the reservation, assignment
Assignment

'Assignment' may refer to:* Assignment , a type of modification to a variable* Assignment , a task given to students* Assignment , a transfer of rights between two parties...
, and reclamation
Reclamation

Reclamation is the process of reclaiming something from loss or from a less useful condition. It is generally used of water reclamation, which, a century ago meant damming streams , and now has come to be used to describe wastewater reclamation....
 of E.164 country codes and associated identification code (IC) assignments. The criteria and procedures are provided as a basis for the effective and efficient utilization of the available E.164 numbering resources. Such assignments require a collaborative
Collaboration

Collaboration is a recursive process where two or more people or organizations work together toward an intersection of common goals ? for example, an intellectual endeavor that is creative in nature?by sharing knowledge, learning and building consensus....
 effort between the ITU-TSB and the appropriate ITU-T study group to endeavor to ensure that the assignments meet the needs of the telecommunication community. The development of these criteria and procedures are in accordance with the principles contained in E.190 and the numbering plan formats detailed in E.164.

E.164.2

This recommendation contains the criteria and procedures for an applicant to be temporarily assigned a three-digit identification code within the shared E.164 country code 991 for the purpose of conducting an international non-commercial trial.

E.164.3

This recommendation describes the principles, criteria, and procedures for the assignment and reclamation of resources within a shared E.164 country code for groups of countries. These shared country codes will coexist with all other E.164-based country codes assigned by the ITU. The resource of the shared country code consists of a country code and a group identification code (CC + GIC) and provides the capability for a group of countries to provide telecommunication services within the group. The TSB is responsible for the assignment of the CC + GIC.

E.163

E.163 was the former ITU-T
ITU-T

The Telecommunication Standardization Sector coordinates standards for telecommunications on behalf of the International Telecommunication Union and is based in Geneva, Switzerland....
 recommendation for describing telephone
Telephone

The telephone is a telecommunications device that is used to transmitter and receive electronically or digitally encoded sound between two or more people conversing....
 numbers for the public switched telephone network
Public switched telephone network

The public switched telephone network is the network of the world's public circuit switching telephone networks, in much the same way that the Internet is the network of the world's public Internet protocol-based packet switching networks....
 (PSTN). In the United States this was formerly referred to as a directory number. E.163 was withdrawn and some recommendations were incorporated into revision 1 of E.164 in 1997.

See also

  • List of country calling codes
    List of country calling codes

    This is a list of country calling codes defined by ITU-T recommendation E.164.The telephone numbering plan for a telephone system includes an international dialing prefix, such as "00" or "011", which must be dialed before the country calling code when dialing an international phone number....
  • ENUM
    Enum

    ENUM or enum may refer to:* Telephone Number Mapping, a suite of protocols to unify the telephone system with the Internet* In some programming languages, enum is a keyword used for introducing an enumerated type....
  • DUNDi


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