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E164

The recommendations of the International Telecommunication Union(ITU) consist of a series identifier and a digit. The E-series recommendations deal with the operation of telephone networks, their addressing and numbering. E.164 is the most widely used addressing standard for public communications network telephone numbers. This standardized numbering scheme forms the set of rules for international telephone numbers.

The call number structure according to E.164

The call numbers in E.164 comprise a maximum of 15 decimal places, which can be evaluated by public networks. In addition, subscriber-specific numbers and services with a further 40 decimal places can be appended. However, these are only recorded by private branch exch anges and terminal systems. The E.164 standard distinguishes between the international telephone number for geographical areas, the international telephone number for networks, and the global identifier for services.

Numbering plan according to E.164

Numbering plan according to E.164

For all E.164 applications, the E.164 number consists of three data fields: the country code(LKZ), the area code(ONKz) or identification code ( IC), and the subscriber number( SN). For international telephone numbers, the E.164 standard prescribes the following data fields: The entire call number comprises 15 digits, of which 1 to 3 digits are used for the country code and the remainder together for the local network code and the subscriber number.

To standardize the various communication and telephone numbers and domain names, the Internet Engineering Task Force( IETF) has developed the enum protocol, Telephone Number Mapping( ENUM). The Enum protocol uses the E.164 telephone numbering plan to convert telephone numbers into domain names. For this purpose, the IETF has established the top level domain *.arpa (Address and RoutingParameterArea). By means of e164.arpa, the telephone numbers can be converted into the domain names to be read in the reverse direction.

Informations:
Englisch: E164
Updated at: 29.01.2014
#Words: 287
Links: international telecommunication union (ITU), digit (DGT), operation, telephone, addressing
Translations: DE
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