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ITU-T O.42 Equipment to measure nonlinear distortion using the 4-tone intermodulation method
ITU-T I.231.4 Circuit-mode bearer service categories : Circuit-mode, alternate speech / 64 kbit/s unrestricted, 8 kHz structured bearer service
ITU-T R.79 Automatic tests of transmission quality on telegraph circuits between switching centres
ITU-T K.23 Types of induced noise and description of noise voltage parameters for ISDN basic user networks
ITU-T S.140 Definitions of essential technical terms relating to apparatus for alphabetic telegraphy
ITU-T G.733 Characteristics of primary PCM multiplex equipment operating at 1544 kbit/s