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ITU-T I.571 Connection of VSAT based private networks to the public ISDN
ITU-T I.525 Interworking between networks operating at bit rates less than 64 kbit/s with 64 kbit/s-based ISDN and B-ISDN
ITU-T V.61 A simultaneous voice plus data modem, operating at a voice plus data signalling rate of 4800 bit/s, with optional automatic switching to data-only 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 V.56ter Test procedure for evaluation of 2-wire 4 kHz voiceband duplex modems
ITU-T R.21 9600 bit/s modem standardized for use in the telegraph TDM system
ITU-T R.22 Data over voice 19200 bit/s modem standardized for use on telephone network subscriber lines
ITU-T V.80 In-band DCE control and synchronous data modes for asynchronous DTE
ITU-T T.0 Classification of facsimile terminals for document transmission over the public networks
ITU-T D.155 Guiding principles governing the apportionment of accounting rates in intercontinental telephone relations