ITU-T E.300-series Recommendations – Supplement 6 Series E: Overall network operation, telephone service, service operation and human factors. Operation of the international service. Preparation of information to customers travelling abroad

ITU-T E.300-series Recommendations – Supplement 5 Series E: Overall network operation, telephone service, service operation and human factors. Operation of the international service. Modelling of an experimental test design for the determination of … ITU-T E.300-series Recommendations – Supplement 4 Series E: Overall network operation, telephone service, service operation and human factors. Operation of the international service. Treatment of calls considered as terminating abnormally ITU-T E.300-series Recommendations – Supplement 3 Series E: Overall network operation, telephone service, service operation and human factors. Operation of the international service. North American precise audible tone plan ITU-T E.300-series Recommendations – Supplement 7 Series E: Overall network operation, telephone service, service operation and human factors. Operation of the international service. Description of INMARSAT existing and planned systems ITU-T Recommendation E.301 Telephone network and ISDN. Operation, numbering, routing and mobile service. Impact of non-voice applications of the telephone network ITU-T Recommendation E.320 Telephone network and ISDN. Operation, numbering, routing and mobile service. Speeding up the establishment and clearing of phototelegraph calls