ITU-T Recommendation E.138 Series E: Overall network operation, telephone service, service operation and human factors… General provisions concerning users. Human factors aspects of public telephones to improve their usability for older people

ITU-T Recommendation E.137 Series E: Overall network operation, telephone service, service operation and human factors. Operation, numbering, routing and mobile services - International operation – General provisions concerning users. User instructions... ITU-T Recommendation E.136 Series E: Overall network operation, telephone service, service operation and human factors. Operation, numbering, routing and mobile services … General provisions concerning users. Specification of a tactile identifier for ... ITU-T Recommendation E.135 Telephone network and ISDN. Operation, numbering, routing and mobile service. Human factors aspects of public telecommunication terminals for people with disabilities Covering note ITU-T Recommendation E.138 (06/2002) Human factors aspects of public telephones to improve their usability for older people CCITT Recommendation E.140 Telephone network and ISDN. Operation, numbering, routing and mobile service. Operator-assisted telephone service ITU-T Recommendation E.148 Telephone network and ISDN. Operation, numbering, routing and mobile service. Routing of traffic by automatic transit exchanges