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ITU-T I.334 Principles relating ISDN numbers/sub-addresses to the OSI reference model network layer addresses
ITU-T I.412 ISDN user-network interfaces; Interface structures and access capabilities
ITU-T I.410 General aspects and principles relating to recommendations on ISDN user-network interfaces
ITU-T P.16 Subjective effects of direct crosstalk; tresholds of audibility and intelligibility
ITU-T I.601 General maintenance principles of ISDN subscriber access and subscriber installation
ITU-T P.32 Evaluation of the efficiency of telephone booths and acoustic hoods