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ITU-T F.423 Message handling services: Intercommunication between the interpersonal messaging service and the telefax service
ITU-T I.231.10 Circuit-mode bearer service categories : Circuit-mode multiple-rate unrestricted 8 kHz structured bearer service
ITU-T F.440 Message handling services, the voice messaging service
ITU-T I.255.1 Community of interest supplementary services : Closed User Group
ITU-T I.256.3 Charging supplementary services : Reverse charging
ITU-T F.500 Directory service, operations and definition of service, international public directory services
ITU-T I.255.5 Community of interest supplementary services : Outgoing call barring
ITU-T F.720 Telematic, data transmission, ISDN broadband, UPT and teleconference services, operations and quality of service, videotelephony services, general
ITU-T F.721 Telematic, data transmission, ISDN broadband, universal, personal telecommunications and teleconference services, operations and quality of service, videotelephony teleservice for ISDN
ITU-T F.812 Broadband connectionless data bearer service
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