ITU-T Recommendation E.164.3 Series E: Overall network operation, telephone service, service operation and human factors… Numbering plan of the international …Principles, criteria and procedures for the assignment and reclamation of E.164 country codes…

ITU-T Recommendation E.164.2 Series E: Overall network operation, telephone service, service operation and human factors. International operation – Numbering plan of the international telephone service. E.164 numbering resources for trials ITU-T Recommendation E.164.1 Series E: Overall network operation, telephone service, service operation and human factors… Numbering plan of the international telephone…Criteria and procedures for the reservation, assignment and reclamation of E.164… Рекомендация МСЭ-Т Е.164 Серия Е: Общая эксплуатация сети, телефонная служба, функционирование служб и человеческие факторы. Международная эксплуатация … Международный план нумерации электросвязи общего пользования ITU-T Recommendation E.165 Telephone network and ISDN. Operation, numbering, routing and mobile service. Timetable for coordinated implementation of the full capability of the numbering plan for the ISDN ERA (recommendation E.164) ITU-T Recommendation E.165.1 Series E: Telephone network and ISDN. Operation, numbering, routing and mobile services…Use of escape code "0" within the E.164 numbering plan during the transition period to implementation of NPI mechanism ITU-T Recommendation E.166/X.122 Series E: Telephone network and ISDN. Operation, numbering, routing and mobile services…Series X: Data networks and open system communication…Numbering plan interworking for the E.164 and X.121 numbering plans