Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Requirements and usage of E.164 numbers in NGN and NGCN (V3.1.1)
"The present document provides an alignment of definitions on E.164 numbers@ based on ITU-T Recommendation E.101 [1]. It provides requirements and describes the manner the numbers will be used within NGN and NGCN environments. Naming issues related to NGCN are out of the scope for the moment. The support of national-only numbers is a national matter and is not addressed in the present document. The document deals with ""geographic country codes"" (i.e. geographic areas or groups of countries) and their associated dialling plans@ not with the international E.164 numbering plan as a whole. Non geographic country codes (such as country codes for networks) are not addressed in the present document. Clause 7 defines the normative statements for numbering use in NGN."