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ITU-T V.29 9600 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits
ITU-T V.31 Electrical characteristics for single-current interchange circuits controlled by contact closure
ITU-T V.31bis Electrical characteristics for single-current interchange circuits using optocouplers
ITU-T V.33 14400 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits
ITU-T V.36 Modems for synchronous data transmission using 60-108 kHz group band circuits
ITU-T V.37 Synchronous data transmission at a data signalling rate higher than 72 kbit/s using 60-108 kHz group band circuits
ITU-T V.51 Organization of the maintenance of international telephone-type circuits used for data transmission
ITU-T V.53 Limits for the maintenance of telephone-type circuits used for data transmission
ITU-T V.56 Comparative tests of modems for use over telephone-type circuits