ITU-T Recommendations

Recommendation E.164 describes the international public telecommunication numbering plan. Recommendation E.190 describes the general principles to be utilized in the assignment of ITU-T E-Series international 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. The criteria and procedures are provided as a basis for the effective and efficient utilization of the available E.164 numbering resources. Such assignments require a collaborative effort between the ITU-TSB and the appropriate ITU-T Study Group to endeavour to ensure that the assignments meet the needs of the telecommunication community. The development of these criteria and procedures are in accordance with the principles contained in Recommendation E.190 and the numbering plan formats detailed in Recommendation E.164.