![]() The number categories are all based on a fifteen-digit numbering space. Specific E.164-based applications which differ in usage are defined in separate recommendations. Annex B provides information on network identification, service parameters, calling/connected line identity, dialing procedures, and addressing for Geographic-based ISDN calls. ![]() Annex A provides additional information on the structure and function of E.164 numbers. The E.164 recommendation provides the telephone number structure and functionality for five categories of telephone numbers used in international public telecommunication.įor each of the categories, it details the components of the numbering structure and the digit analysis required for successful routing of calls. The Secretariat of the ITU Standardization Sector ( ITU-T), the Telecommunication Standardization Bureau (TSB) is responsible for the assignment of the CC + GIC. 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. ![]() These shared country codes will coexist with all other E.164-based country codes assigned by the ITU. 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. ![]() 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. The criteria and procedures are provided as a basis for the effective and efficient utilization of the available E.164 numbering resources. This recommendation describes the procedures and criteria for the reservation, assignment, and reclamation of E.164 country codes and associated identification code (IC) assignments. E.163 was withdrawn, and some recommendations were incorporated into revision 1 of E.164 in 1997. In the United States, this was formerly referred to as a directory number. The title of the original version and first revision of the E.164 standard was Numbering Plan for the ISDN Era Recommendations E.163Į.163 was the former ITU-T recommendation for describing telephone numbers for the public switched telephone network (PSTN). Any country-specific international call prefixes are not contained in the specification. 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.Īlternative formats (with area codes and country specific numbers) are available. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits.
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