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ITU-T Q.675 Interworking of signalling systems - Logic procedures for interworking of signalling system R1 to signalling system No. 7 (ISUP)
ITU-T Q.766 Performance objectives in the Integrated Services Digital Network application
ITU-T Q.930 Digital subscriber signalling system No. 1 (DSS 1) - ISDN user-network interface layer 3 - General aspects
ITU-T Q.953.2 Stage 3 description for call completion supplementary services using DSS 1 : Call hold
ITU-T U.1 Signalling conditions to be applied in the international telex service
ITU-T U.11 Telex and gentex signalling on intercontinental circuits used for intercontinental automatic transit traffic (Type C signalling)
ITU-T U.40 Reactions by automatic terminals connected to the telex network in the event of ineffective call attempts or signalling incidents
ITU-T U.45 Response to the not-ready condition of the telex terminal
ITU-T U.101 Signalling systems for the Intex service (Types E and F signalling)
ITU-T U.200 The international telex service - General technical requirements for interworking
ITU-T U.206 Technical requirements for interworking between the international telex service and the videotex service