ITU-T E.129: Study Group 2

This Recommendation assists numbering plan administrators by describing a methodology to access and provide ITU-T E.164 numbering information on their country's national numbering plan (NNP) in a timely manner. Guidance includes, but is not limited to, methods on how to obtain information on national numbering plans, how to present and describe the numbering plans, and how to ensure the timely posting of numbering plan changes in a standardized presentation that is consistent with [ITU-T E.164]. While the basic objective of this Recommendation is to present geographic country code (CC) information, it may also be used to communicate numbering information for network code applications and for country codes assigned to groups of countries (GoC). In addition, this Recommendation helps to collect other information that may be relevant, such as numbers related to important services like emergency services (emergency numbers) and other services of social value¹, as well as information on the implementation of number portability (NP) of ITU-T E.164 numbers.

¹ As defined in [b-ITU-T E.164 Sup.6].