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ITU-T F.111 Principles of service for mobile systems
ITU-T D.220 Charging and accounting principles to be applied to international circuit-mode demand bearer services provided over the integrated services digital network (ISDN)
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.784 ISUP basic call test specification
ITU-T Q.767 Application of the ISDN User Part of CCITT signalling system No. 7 for international ISDN interconnections
ITU-T G.726 40, 32, 24, 16 kbit/s adaptive differential pulse code modulation (ADPCM)
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
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