ITU-T Recommendation E.164 Series E: Overall network operation, telephone service, service operation and human factors… Numbering plan of the international telephone service. Supplement 1 Alternatives for carrier selection and network identification

ITU-T Recommendation E.156 Series E: Overall network operation, telephone service, service operation and human factors… Operation of international telephone services. Guidelines for ITU-T action on reported misuse of E.164 number resources ITU-T Recommendation E.155 – Amendment 1 Series E: Overall network operation, telephone service, service operation and human factors. International operation – Operation of international telephone services. International premium rate service ITU-T Recommendation E.155 Series E: Overall network operation, telephone service, service operation and human factors. Operation, numbering, routing and mobile services … Operation of international telephone services. International premium rate service ITU-T Recommendation E.164 Series E: Overall network operation, telephone service …Numbering plan of the international telephone service. The international public telecommunication numbering plan. Supplement 2 Number portability ITU-T Recommendation E.164 Series E: Overall network operation, telephone service… Numbering plan of the international …Supplement 3 Operational and administrative issues associated with national implementation of the ENUM functions ITU-T Recommendation E.164 Series E: Overall network operation, telephone service… Numbering plan… Supplement 4 Operational and administrative issues associated with the implementation of ENUM for non-geographic country codes