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ITU-T U.206 Technical requirements for interworking between the international telex service and the videotex service
ITU-T U.207 Technical requirements to be met for the transfer of messages between terminals of the international telex service and group 3 facsimile terminals connected to the PSTN
ITU-T U.220 The international telex service - Technical requirements for a status enquiry function in an interworking scenario
ITU-T E.550 Grade-of-service and new performance criteria under failure conditions in international telephone exchanges
ITU-T E.301 Impact of non-voice applications on the telephone network
ITU-T E.846 Accessibility for 64 kbit/s circuit switched international end-to-end ISDN connection types
ITU-T O.133 Equipment for measuring the performance of PCM encoders and decoders
ITU-T Q.86.3 Stage 2 description for charging supplementary services : Reverse charging (REV)
ITU-T Q.698 Interworking of signalling system No. 7 ISUP, TUP and signalling system No. 6 using arrow diagrams
ITU-T Q.939 Typical DSS1 service indicator codings for ISDN telecommunications services
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