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ITU-T E.132 Standardization of elements of control procedures for supplementary telephone services
ITU-T E.131 Subscriber control procedures for supplementary telephone services
ITU-T E.148 Routing of traffic by automatic transit exchanges
ITU-T E.149 Presentation of routing data
ITU-T E.167 ISDN network identification code
ITU-T E.171 International telephone routing plan
ITU-T E.165 Timetable for coordinated implementation of the full capability of the numbering plan for the ISDN era
ITU-T E.175 Models for international network planning
ITU-T E.181 Customer recognition of foreign tones
ITU-T E.184 Indications to users of ISDN terminals
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