No products
ITU-T F.420 Message handling services; the public interpersonal messaging service
ITU-T F.440 Message handling services; the voice messaging service
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 I.255.1 Community of interest supplementary services : Closed User Group
ITU-T I.256.3 Charging supplementary services : Reverse charging
ITU-T I.255.5 Community of interest supplementary services : Outgoing call barring
ITU-T F.500 Directory service; operations and definition of service; international public directory services
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
ITU-T D.3 Principles for the lease of analogue international circuits for private service