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ITU-T X.30 Support of X.21, X.21 bis...
FORD WSB-M7H49-A 2010 Edition, March...
ITU-T G.962 Access digital section for ISDN primary rate at 2048 kbit/s
ITU-T H.200 Framework for recommendations for audiovisual services
ITU-T I.210 Principles of telecommunication services supported by an ISDN and the means to describe them
ITU-T I.241.7 Teleservices supported by an ISDN : Telephony 7 kHz teleservice
ITU-T I.325 Reference configurations for ISDN connection types
ITU-T I.350 General aspects of quality of service and network performance in digital networks, including ISDNs