ITU-T Recommendation E.174 Telephone network and ISDN. Operation, numbering, routing and mobile service. Routing principles and guidance for universal personal telecommunications (UPT)

CCITT Recommendation E.173 Telephone network and ISDN. Operation, numbering, routing and mobile service. Routing plan for interconnection between public land mobile networks and fixed terminal networks CCITT Recommendation E.172 Telephone network and ISDN. Operation, numbering, routing and mobile service. ISDN routing plan ITU-T Recommendation E.171 Telephone network and ISDN. Operation, numbering, routing and mobile service. International telephone routing plan ITU-T Recommendation E.175 Telephone network and ISDN. Operation, numbering, routing and mobile service. Models for international network planning ITU-T Recommendation E.177 Series E: Telephone network and ISDN. Operation, numbering, routing and mobile services – International operation – International routing plan. B-ISDN routing ITU-T Recommendation E.180/Q.35 Series E: Overall network operation, telephone service, service operation and human factors… Series Q: Switching and signalling. International automatic… Technical characteristics of tones for the telephone service