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ITU-T I.120 Integrated services digital networks (ISDNs)
ITU-T I.221 Common specific characteristics of services
ITU-T I.241.7 Teleservices supported by an ISDN : Telephony 7 kHz teleservice
ITU-T I.310 ISDN - Network functional principles
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
ITU-T I.352 Network performance objectives for connection processing delays in an ISDN
ITU-T I.372 Frame relaying bearer service network-to-network interface requirements
ITU-T I.373 Network capabilities to support universal personal telecommunication (UPT)