ITU-T E.129 PDF

The scope of this Recommendation is dedicated to assist and make available timely access to ITU-T E.164 numbering information in each country's national numbering plan (NNP). This includes, but is not limited to, how to obtain information on national numbering plans, how they should be described, and 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 information, it may also be used to communicate numbering information for network code applications and for country codes assigned to groups of countries (GoC).