|
Номер/код Страна Регион Город Оператор |
|
Международный код
Страны с междугородным кодом 164
| Страна | На английском | Международный код страны | Выход на междугороднюю связь (trunk prefix) | Выход на международную связь (dial out code / exit code) | Длина телефона | ISO |
| Острова Тёркс и Кайкос | tc | 1649 | 1 | 011 | (649)+7 digits | tc / tca |
Источники информации
Информация по коду 164 была собрана из различных открытых источников, в том
числе:
- International Numbering Resources Database
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Поделитесь страницей в соцсетях, блогах или персонально в мессенджере:
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From Wikipedia, the free encyclopedia
(Redirected from E164.org)
| The international public telecommunication numbering plan | |
| Status | In force |
|---|---|
| Year started | 1984 |
| Latest version | June 2020 |
| Organization | ITU-T |
| Committee | Study Group 2 |
| Related standards | E.123, E.163 |
| Domain | telephony |
| Website | https://www.itu.int/rec/T-REC-E.164/ |
E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks.
E.164 defines a general format for international telephone numbers. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits.[1] The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve digits.
Alternative formats (with area codes and country specific numbers) are available. Any country-specific international call prefixes are not contained in the specification.
The title of the original version and first revision of the E.164 standard was Numbering Plan for the ISDN Era
Recommendations
E.163
E.163 was the former ITU-T recommendation for describing telephone numbers for the public switched telephone network (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 E.163 was withdrawn, and some recommendations were incorporated into revision 1 of E.164 in 1997.[2]
E.164.1
This recommendation describes the procedures and criteria for the reservation, assignment, and reclamation of E.164 country codes and associated identification code (IC) assignments.[3] The criteria and procedures are provided as a basis for the effective and efficient utilization of the available E.164 numbering resources.
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.[4]
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.[5] 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 Secretariat of the ITU Standardization Sector (ITU-T), the Telecommunication Standardization Bureau (TSB) is responsible for the assignment of the CC + GIC.
Numbering formats
The E.164 recommendation provides the telephone number structure and functionality for five categories of telephone numbers used in international public telecommunication.
For each of the categories, it details the components of the numbering structure and the digit analysis required for successful routing of calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides information on network identification, service parameters, calling/connected line identity, dialing 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. Before 1997, only twelve digits were allowed. The definition does not include any international call prefixes, necessary for a call to reach international circuits from inside the country of call origination.
Geographic areas
| Country Code | National Destination Code | Subscriber Number |
|---|---|---|
| 1 to 3 digits | maximum 14 digits | |
| maximum 15 digits |
Global services
| Country Code | Global Subscriber Number |
|---|---|
| 3 digits | maximum 12 digits |
| maximum 15 digits |
[1] Figure 2
Networks
| Country Code | Identification Code | Subscriber Number |
|---|---|---|
| 3 digits | 1 to 4 digits | maximum 11 digits |
| maximum 15 digits |
Groups of countries
| Country Code | Group Identification Code | Subscriber Number |
|---|---|---|
| 3 digits | 1 digit | maximum 11 digits |
| maximum 15 digits |
Trials
| Fixed code | Trial Identification Code | Subscriber Number |
|---|---|---|
| 991 | 1 digit | maximum 11 digits |
| maximum 15 digits |
Uses of E.164 Numbers
E.164 numbers were originally defined for use in the worldwide public switched telephone network (PSTN). The early PSTN collected routing digits from users (e.g. on a dial pad), signaled those digits to each telephony switch, and used the numbers to determine how to ultimately reach the called party.
ITU-T E.123 entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses provides guidance when printing E.164 telephone numbers. This format includes the recommendation of prefixing international telephone numbers with a plus sign (+) and including visual separators such as the hyphen (-).
The presentation of a telephone number with the plus sign (+) indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806.[6] The international calling prefix is a trunk code to reach an international circuit in the country of call origination.[7]
DNS Mapping of E.164 Numbers
Some national telephone administrations and telephone companies have implemented an Internet-based database for their numbering spaces. E.164 numbers may be registered in the Domain Name System (DNS) of the Internet in which the second-level domain e164.arpa has been reserved for telephone number mapping (ENUM). In the system, any telephone number may be mapped into a domain name using a reverse sequence of subdomains for each digit. For example, the telephone number +19995550123 translates to the domain name 3.2.1.0.5.5.5.9.9.9.1.e164.arpa. When a number is mapped, a DNS query may be used to locate the service facilities on the Internet that accept and process telephone calls to the owner of record of the number, using, for example, the Session Initiation Protocol (SIP), a call-signaling VoIP protocol whose SIP addresses are similar in format (user@domain…) to e-mail addresses. This allows a direct, end-to-end Internet connection without passing through the public switched telephone network.
See also
- Carrier of Record
- E.123
- List of country calling codes
References
- ^ a b «E.164 : The international public telecommunication numbering plan». www.itu.int. p. 11. Archived from the original on 2019-11-06. Retrieved 2019-11-12.
- ^ «E.163 : Numbering plan for the international telephone service». www.itu.int. Archived from the original on 2019-07-29. Retrieved 2019-11-12.
- ^ «E.164.1 : Criteria and procedures for the reservation, assignment and reclamation of E.164 country codes and associated identification codes (ICs)». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ «E.164.2 : E.164 numbering resources for trials». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ «E.164.3 : Principles, criteria and procedures for the assignment and reclamation of E.164 country codes and associated identification codes for groups of countries». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ URLs for Telephone Calls. IETF. April 2000. sec. 2.2. doi:10.17487/RFC2806. RFC 2806. Retrieved January 11, 2021.
- ^ Olsen, Chris (2011-08-01). Implementing Cisco Unified Communications Manager, Part 2 (CIPT2) Foundation Learning Guide: (CCNP Voice CIPT2 642-457). Cisco Press. p. 172. ISBN 9780132312141.
External links
- Text of the Recommendation, Amd. 1 and supplement 6 (E.164)
- List of ITU-T Recommendation E.164 assigned country codes as of 15 December 2016
- List of ITU-T Recommendation E.164 Dialling Procedures as of 15 December 2011
- Numbering plan for the international telephone service (E.163) (incorporated in E.164)
- World Telephone Numbering Guide
From Wikipedia, the free encyclopedia
(Redirected from E164.org)
| The international public telecommunication numbering plan | |
| Status | In force |
|---|---|
| Year started | 1984 |
| Latest version | June 2020 |
| Organization | ITU-T |
| Committee | Study Group 2 |
| Related standards | E.123, E.163 |
| Domain | telephony |
| Website | https://www.itu.int/rec/T-REC-E.164/ |
E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks.
E.164 defines a general format for international telephone numbers. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits.[1] The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve digits.
Alternative formats (with area codes and country specific numbers) are available. Any country-specific international call prefixes are not contained in the specification.
The title of the original version and first revision of the E.164 standard was Numbering Plan for the ISDN Era
Recommendations
E.163
E.163 was the former ITU-T recommendation for describing telephone numbers for the public switched telephone network (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.[2]
E.164.1
This recommendation describes the procedures and criteria for the reservation, assignment, and reclamation of E.164 country codes and associated identification code (IC) assignments.[3] The criteria and procedures are provided as a basis for the effective and efficient utilization of the available E.164 numbering resources.
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.[4]
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.[5] 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 Secretariat of the ITU Standardization Sector (ITU-T), the Telecommunication Standardization Bureau (TSB) is responsible for the assignment of the CC + GIC.
Numbering formats
The E.164 recommendation provides the telephone number structure and functionality for five categories of telephone numbers used in international public telecommunication.
For each of the categories, it details the components of the numbering structure and the digit analysis required for successful routing of calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides information on network identification, service parameters, calling/connected line identity, dialing 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. Before 1997, only twelve digits were allowed. The definition does not include any international call prefixes, necessary for a call to reach international circuits from inside the country of call origination.
Geographic areas
| Country Code | National Destination Code | Subscriber Number |
|---|---|---|
| 1 to 3 digits | maximum 14 digits | |
| maximum 15 digits |
Global services
| Country Code | Global Subscriber Number |
|---|---|
| 3 digits | maximum 12 digits |
| maximum 15 digits |
[1] Figure 2
Networks
| Country Code | Identification Code | Subscriber Number |
|---|---|---|
| 3 digits | 1 to 4 digits | maximum 11 digits |
| maximum 15 digits |
Groups of countries
| Country Code | Group Identification Code | Subscriber Number |
|---|---|---|
| 3 digits | 1 digit | maximum 11 digits |
| maximum 15 digits |
Trials
| Fixed code | Trial Identification Code | Subscriber Number |
|---|---|---|
| 991 | 1 digit | maximum 11 digits |
| maximum 15 digits |
Uses of E.164 Numbers
E.164 numbers were originally defined for use in the worldwide public switched telephone network (PSTN). The early PSTN collected routing digits from users (e.g. on a dial pad), signaled those digits to each telephony switch, and used the numbers to determine how to ultimately reach the called party.
ITU-T E.123 entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses provides guidance when printing E.164 telephone numbers. This format includes the recommendation of prefixing international telephone numbers with a plus sign (+) and including visual separators such as the hyphen (-).
The presentation of a telephone number with the plus sign (+) indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806.[6] The international calling prefix is a trunk code to reach an international circuit in the country of call origination.[7]
DNS Mapping of E.164 Numbers
Some national telephone administrations and telephone companies have implemented an Internet-based database for their numbering spaces. E.164 numbers may be registered in the Domain Name System (DNS) of the Internet in which the second-level domain e164.arpa has been reserved for telephone number mapping (ENUM). In the system, any telephone number may be mapped into a domain name using a reverse sequence of subdomains for each digit. For example, the telephone number +19995550123 translates to the domain name 3.2.1.0.5.5.5.9.9.9.1.e164.arpa. When a number is mapped, a DNS query may be used to locate the service facilities on the Internet that accept and process telephone calls to the owner of record of the number, using, for example, the Session Initiation Protocol (SIP), a call-signaling VoIP protocol whose SIP addresses are similar in format (user@domain…) to e-mail addresses. This allows a direct, end-to-end Internet connection without passing through the public switched telephone network.
See also
- Carrier of Record
- E.123
- List of country calling codes
References
- ^ a b «E.164 : The international public telecommunication numbering plan». www.itu.int. p. 11. Archived from the original on 2019-11-06. Retrieved 2019-11-12.
- ^ «E.163 : Numbering plan for the international telephone service». www.itu.int. Archived from the original on 2019-07-29. Retrieved 2019-11-12.
- ^ «E.164.1 : Criteria and procedures for the reservation, assignment and reclamation of E.164 country codes and associated identification codes (ICs)». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ «E.164.2 : E.164 numbering resources for trials». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ «E.164.3 : Principles, criteria and procedures for the assignment and reclamation of E.164 country codes and associated identification codes for groups of countries». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ URLs for Telephone Calls. IETF. April 2000. sec. 2.2. doi:10.17487/RFC2806. RFC 2806. Retrieved January 11, 2021.
- ^ Olsen, Chris (2011-08-01). Implementing Cisco Unified Communications Manager, Part 2 (CIPT2) Foundation Learning Guide: (CCNP Voice CIPT2 642-457). Cisco Press. p. 172. ISBN 9780132312141.
External links
- Text of the Recommendation, Amd. 1 and supplement 6 (E.164)
- List of ITU-T Recommendation E.164 assigned country codes as of 15 December 2016
- List of ITU-T Recommendation E.164 Dialling Procedures as of 15 December 2011
- Numbering plan for the international telephone service (E.163) (incorporated in E.164)
- World Telephone Numbering Guide
10 января, Минск /Корр. БЕЛТА/. Республиканское унитарное предприятие «Белтелеком» автоматизирует столичную круглосуточную справочную службу 164, предоставляющую сведения о выставленных к оплате суммах за услуги электросвязи. Об этом корреспонденту БЕЛТА сообщили в пресс-службе предприятия.
«Справочная служба 164, круглосуточно предоставляющая физическим лицам сведения о выставленных к оплате суммах за услуги связи, для абонентов Минска с 10 января работает в автоматическом режиме, то есть без участия оператора. В скором времени на новые условия работы служба 164 перейдет и в других областях», — пояснили в пресс-службе.
Позвонив в справочную службу 164 со стационарного телефона, принадлежащего физическому лицу, абонент может получить информацию о выставленных суммах для этого номера. При обращении с мобильного телефона или стационарного телефона с тональным набором абонент, следуя голосовым подсказкам, может получить информацию о выставленных суммах на любой номер, принадлежащий физическому лицу. Получить справку о начислениях за услуги связи в прошедшем месяце можно начиная с 7-го числа текущего месяца.
За получение информации по номеру 164 оплата не взимается. За телефонное соединение на номер 164 при звонке со стационарного телефона оплата взимается по тарифам местного соединения (за каждую полную и неполную минуту). За соединение на номер 164 при звонке с мобильного телефона взимается оплата по тарифам оператора сотовой подвижной электросвязи.-0-
E.164 — рекомендация ITU-T, определяющая общий международный телекоммуникационный план нумерации, используемый в телефонных сетях общего пользования и некоторых других сетях.
Рекомендацией E.164 также определяется формат телефонных номеров. Номера по E.164 могут иметь максимум 15 цифр и обычно записываются с префиксом «+». Чтобы позвонить по номеру, записанному в стандарте E.164, с обычного телефонного аппарата нужно вместо знака «+» использовать соответствующий префикс выхода на международную линию.
Название оригинального стандарта и его первой редакции было таким: «План нумерации в эру ISDN» («Numbering Plan for the ISDN era»).
Содержание
- 1 Адреса
- 2 Категории
- 2.1 Структура номера для географических зон
- 2.2 Структура номера для глобальных служб
- 2.3 Структура международного номера для cетей
- 3 Рекомендации в E.164
- 3.1 E.164.1
- 3.2 E.164.2
- 3.3 E.164.3
- 4 См. также
- 5 Внешние ссылки
Адреса
Адреса E.164 могут быть использованы в DNS с помощью электронной нумерации (ENUM, Electronic Numeration), которая выделяет особую зону, главным образом, e164.arpa для использования номеров E.164. Любой телефонный номер, например, +74951234567 может быть преобразован в унифицированный (единообразный) идентификатор ресурса (URI) записью цифр в обратном порядке, разделением их точками и добавлением суффикса e164.arpa, для нашего примера:
- 7.6.5.4.3.2.1.5.9.4.7.e164.arpa
(Существует «эксперимент в удалённой печати», использующий домен tpc.int, который с помощью этого метода адресует электронную почту на факсы.)
DNS можно использовать для получения интернет-адресов для таких служб, как SIP VoIP-телефония. Альтернативным способом может послужить DUNDi — P2P-реализация ENUM.
E.163 — старый стандарт ITU-T, описывающий телефонные номера для телефонной сети общего пользования (ТфОП). E.163 теперь не применяется и включён в редакцию 1 рекомендации E.164 в 1997 году.
Категории
Рекомендация описывает структуру номера и функциональность для трёх категорий номеров, используемых в международных телекоммуникациях общего пользования.
Для каждой из этих категорий E.164 уточняет компоненты номерной структуры и разложение цифр номера, требуемый для успешной маршрутизации звонков.
Приложение A содержит дополнительную информацию и функции номеров E.164.
Приложение B содержит сведения о сетевой идентификации, служебных параметрах, тождественности звонящей/связанной линии, процедурах звонков и адресации для географически-определяемых ISDN-звонков. Особые применения E.164 определены в отдельных рекомендациях.
Структура номера для географических зон
| Код страны | Национальный код пункта назначения | Номер абонента |
|---|---|---|
| cc = 1—3 цифры | максимум 15−cc цифр | |
| Национальный (необходимый) номер | ||
| Международный номер телекоммуникационной сети общего пользования для географических зон (максимум 15 цифр) |
Структура номера для глобальных служб
| Код страны | Глобальный номер абонента |
|---|---|
| cc = 3 цифры | максимум 12 цифр |
| Международный номер телекоммуникационной сети общего пользования для глобальных служб (максимум 15 цифр) |
Структура международного номера для cетей
| Код страны | Идентификационный код | Номер абонента |
|---|---|---|
| cc = 3 цифры | x = 1—4 цифры | максимум (12-x) цифр |
| Международный номер телекоммуникационной сети общего пользования для сетей (максимум 15 цифр) |
Рекомендации в E.164
E.164.1
Эта рекомендация описывает процедуры и критерии для резервирования, присваивания и отзыва кодов стран в E.164 и соответствующих идентификационных кодов (IC, Identification Codes). Критерий и процедуры предусмотрены так, чтобы эффективно использовать доступные номерные ресурсы E.164. Такие присвоения требуют совместное приложение усилий ITU-TSB и соответствующей Группы изучения ITU-T (ITU-T Study Group), чтобы присвоения удовлетворяли нуждам телекоммуникационного общества. Разработка этих критериев и процедур проходит в соответствии с принципами, заложенными в E.190, и с форматами плана нумерации, описанного в E.164.
E.164.2
Эта рекомендация содержит критерии и процедуры присвоения временного трёхзначного цифрового идентификационного кода в общем коде страны 991 в целях проведения международного некоммерческого тестирования.
E.164.3
Эта рекомендация описывает принципы, критерии и процедуры для присвоения и отзыва ресурсов в общем для нескольких стран или территорий коде страны E.164. Эти общие коды стран сосуществуют со всеми остальными кодами стран, присвоенными ITU. Ресурс общего кода страны состоит из собственно кода страны и группового идентификационного кода (CC + GIC, Country Code + Group Identification Code) и обеспечивает возможность группе стран предоставлять телекоммуникационные услуги внутри этой группы стран. За присвоение CC + GIC отвечает ITU-TSB.
См. также
- Список телефонных кодов стран
Внешние ссылки
- Коммерческие телекоммуникационные стандарты: Рекомендации ITU-T (англ.)
- Distributed Universal Number Discovery
- Recommendation E.164 (02/05)RUS
From Wikipedia, the free encyclopedia
| The international public telecommunication numbering plan | |
| Status | In force |
|---|---|
| Year started | 1984 |
| Latest version | June 2020 |
| Organization | ITU-T |
| Committee | Study Group 2 |
| Related standards | E.123, E.163 |
| Domain | telephony |
| Website | https://www.itu.int/rec/T-REC-E.164/ |
E.164 is an international standard (ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks.
E.164 defines a general format for international telephone numbers. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits.[1] The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve digits.
Alternative formats (with area codes and country specific numbers) are available. Any country-specific international call prefixes are not contained in the specification.
The title of the original version and first revision of the E.164 standard was Numbering Plan for the ISDN Era
Recommendations
E.163
E.163 was the former ITU-T recommendation for describing telephone numbers for the public switched telephone network (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.[2]
E.164.1
This recommendation describes the procedures and criteria for the reservation, assignment, and reclamation of E.164 country codes and associated identification code (IC) assignments.[3] The criteria and procedures are provided as a basis for the effective and efficient utilization of the available E.164 numbering resources.
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.[4]
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.[5] 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 Secretariat of the ITU Standardization Sector (ITU-T), the Telecommunication Standardization Bureau (TSB) is responsible for the assignment of the CC + GIC.
Numbering formats
The E.164 recommendation provides the telephone number structure and functionality for five categories of telephone numbers used in international public telecommunication.
For each of the categories, it details the components of the numbering structure and the digit analysis required for successful routing of calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides information on network identification, service parameters, calling/connected line identity, dialing 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. Before 1997, only twelve digits were allowed. The definition does not include any international call prefixes, necessary for a call to reach international circuits from inside the country of call origination.
Geographic areas
| Country Code | National Destination Code | Subscriber Number |
|---|---|---|
| 1 to 3 digits | maximum 14 digits | |
| maximum 15 digits |
Global services
| Country Code | Global Subscriber Number |
|---|---|
| 3 digits | maximum 12 digits |
| maximum 15 digits |
[1] Figure 2
Networks
| Country Code | Identification Code | Subscriber Number |
|---|---|---|
| 3 digits | 1 to 4 digits | maximum 11 digits |
| maximum 15 digits |
Groups of countries
| Country Code | Group Identification Code | Subscriber Number |
|---|---|---|
| 3 digits | 1 digit | maximum 11 digits |
| maximum 15 digits |
Trials
| Fixed code | Trial Identification Code | Subscriber Number |
|---|---|---|
| 991 | 1 digit | maximum 11 digits |
| maximum 15 digits |
Uses of E.164 Numbers
E.164 numbers were originally defined for use in the worldwide public switched telephone network (PSTN). The early PSTN collected routing digits from users (e.g. on a dial pad), signaled those digits to each telephony switch, and used the numbers to determine how to ultimately reach the called party.
ITU-T E.123 entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses provides guidance when printing E.164 telephone numbers. This format includes the recommendation of prefixing international telephone numbers with a plus sign (+) and including visual separators such as the hyphen (-).
The presentation of a telephone number with the plus sign (+) indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806.[6] The international calling prefix is a trunk code to reach an international circuit in the country of call origination.[7]
DNS Mapping of E.164 Numbers
Some national telephone administrations and telephone companies have implemented an Internet-based database for their numbering spaces. E.164 numbers may be registered in the Domain Name System (DNS) of the Internet in which the second-level domain e164.arpa has been reserved for telephone number mapping (ENUM). In the system, any telephone number may be mapped into a domain name using a reverse sequence of subdomains for each digit. For example, the telephone number +19995550123 translates to the domain name 3.2.1.0.5.5.5.9.9.9.1.e164.arpa. When a number is mapped, a DNS query may be used to locate the service facilities on the Internet that accept and process telephone calls to the owner of record of the number, using, for example, the Session Initiation Protocol (SIP), a call-signaling VoIP protocol whose SIP addresses are similar in format (user@domain…) to e-mail addresses. This allows a direct, end-to-end Internet connection without passing through the public switched telephone network.
See also
- Carrier of Record
- E.123
- List of country calling codes
References
- ^ a b «E.164 : The international public telecommunication numbering plan». www.itu.int. p. 11. Archived from the original on 2019-11-06. Retrieved 2019-11-12.
- ^ «E.163 : Numbering plan for the international telephone service». www.itu.int. Archived from the original on 2019-07-29. Retrieved 2019-11-12.
- ^ «E.164.1 : Criteria and procedures for the reservation, assignment and reclamation of E.164 country codes and associated identification codes (ICs)». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ «E.164.2 : E.164 numbering resources for trials». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ «E.164.3 : Principles, criteria and procedures for the assignment and reclamation of E.164 country codes and associated identification codes for groups of countries». www.itu.int. Archived from the original on 2019-11-12. Retrieved 2019-11-12.
- ^ URLs for Telephone Calls. IETF. April 2000. sec. 2.2. doi:10.17487/RFC2806. RFC 2806. Retrieved January 11, 2021.
- ^ Olsen, Chris (2011-08-01). Implementing Cisco Unified Communications Manager, Part 2 (CIPT2) Foundation Learning Guide: (CCNP Voice CIPT2 642-457). Cisco Press. p. 172. ISBN 9780132312141.
External links
- Text of the Recommendation, Amd. 1 and supplement 6 (E.164)
- List of ITU-T Recommendation E.164 assigned country codes as of 15 December 2016
- List of ITU-T Recommendation E.164 Dialling Procedures as of 15 December 2011
- Numbering plan for the international telephone service (E.163) (incorporated in E.164)
- World Telephone Numbering Guide