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ITU-T G.802 Interworking between networks based on different digital hierarchies and speech encoding laws
ITU-T S.18 Conversion between International Telegraph Alphabet No. 2 and International Alphabet No. 5
ITU-T P Supplement 16 Guidelines for placement of microphones and loudspeakers in telephone conference rooms and for group audio terminals (GATs)
ITU-T N.12 Measurements to be made during the line-up period that precedes a sound-programme transmission
ITU-T G.711 Pulse code modulation (PCM) of voice frequencies
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 Q.32 Reduction of the risk of instability by switching means