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ITU-T G.727 5-, 4-, 3- and 2-bits sample embedded adaptive differential pulse code modulation (ADPCM)
ITU-T G.764 Voice packetization, packetized voice protocols
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.255.4 Community of interest supplementary services : Priority service
ITU-T I.255.3 Community of interest supplementary services : Multi-level precedence and preemption service (MLPP)
ITU-T I.253.1 Call completion supplementary services : Call waiting (CW) supplementary service
ITU-T J.61 Transmission performance of television circuits designed for use in international connections
ITU-T J.63 Insertion of test signals in the field-blanking interval of monochrome and colour television signals
ITU-R M.540-2 Operational and technical characteristics for an automated direct-printing telegraph system for promulgation of navigational and meteorological warnings and urgent information to ships
ITU-R M.688-0 Technical characteristics for a high frequency direct-printing telegraph system for promulgation of high seas and NAVTEX-type maritime safety information
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