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ITU-T I.241.2 Teleservices supported by an ISDN : Teletex
ITU-T I.241.3 Teleservices supported by an ISDN : Telefax 4
ITU-T I.241.4 Teleservices supported by an ISDN : Mixed mode
ITU-T I.241.5 Teleservices supported by an ISDN : Videotex
ITU-T I.241.6 Teleservices supported by an ISDN : Telex
ITU-T I.252.1 Call offering supplementary services : Call Transfer
ITU-T I.252.6 Call offering supplementary services : Line Hunting (LH)
ITU-T E.110 Organization of the international telephone network
ITU-T E.100 Definitions of terms used in international telephone operation
ITU-T E.111 Extension of international telephone services
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