ITU-T Recommendation E.168 Series E: Overall network operation, telephone service, service operation and human factors. International operation – Numbering plan of the international telephone service. Application of E.164 numbering plan for UPT

ITU-T Recommendation E.167 Telephone network and ISDN. Operation, numbering, routing and mobile service. ISDN network identification codes 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 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.168 (2002) - Amendment 1 Series E: Overall network operation, telephone service, service operation and human factors…Application of E.164 numbering plan for UPT. Amendment 1: New Appendix I ITU-T Recommendation E.168.1 Series E: Overall network operation, telephone service, service operation and human factors…Assignment procedures for universal personal telecommunications (UPT) numbers in the provisioning of the international… Рекомендация МСЭ-Т Е.168.1 Серия Е: Общая эксплуатация сети, телефонная служба, функционирование служб и человеческие факторы…Процедуры назначения номеров универсальной персональной электросвязи (UPT) при предоставлении международной службы UPT