ITU-T Recommendation E.130 Telephone network and ISDN. Operation, numbering, routing and mobile service. Choice of the most useful and desirable supplementary telephone services

ITU-T Recommendation E.129 Series E: Overall network operation, telephone service, service operation and human factors. International operation – General provisions concerning users. Presentation of national numbering plans ITU-T Recommendation E.128 Telephone network and ISDN. Operation, numbering, routing and mobile service. Leaflet to be distributed to foreign visitors ITU-T Recommendation E.127 Telephone network and ISDN. Operation, numbering, routing and mobile service. Pages in the telephone directory intended for foreign visitors ITU-T Recommendation E.131 Telephone network and ISDN. Operation, numbering, routing and mobile service. Subscriber control procedures for supplementary telephone services ITU-T Recommendation E.132 Telephone network and ISDN. Operation, numbering, routing and mobile service. Standardization of elements of control procedures for supplementary telephone services ITU-T Recommendation E.133 Telephone network and ISDN. Operation, numbering, routing and mobile service. Operating procedures for cardphones