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ITU-T D.240 Charging and accounting principles for teleservices supported by the ISDN
ITU-T D.260 Charging and accounting capabilities to be applied on the ISDN
ITU-T X.800 Security architecture for Open Systems Interconnection for CCITT applications
ITU-T V.17 A 2-wire modem for facsimile applications with rates up to 14400 bit/s
ITU-T Q.767 Application of the ISDN User Part of CCITT signalling system No. 7 for international ISDN interconnections
ITU-T V.32bis A duplex modem operating at data signalling rates of up to 14400 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits
ITU-T G.726 40, 32, 24, 16 kbit/s adaptive differential pulse code modulation (ADPCM)
ITU-T G.727 5-, 4-, 3- and 2-bits sample embedded adaptive differential pulse code modulation (ADPCM)
ITU-T F.83 Operational principles for communication between terminals of the international telex service and data terminal equipment on packet-switched public data networks
ITU-T I.255.3 Community of interest supplementary services : Multi-level precedence and preemption service (MLPP)