Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 4: Gateways basic operation - Sub-part 2: Integrated Services Digital Network (ISDN) gateway
Integrated Services Digital Network (ISDN) - Completion of Calls on No Reply (CCNR) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification
Integrated Services Digital Network (ISDN) - Calling Line Identification Presentation (CLIP) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification
Integrated Services Digital Network (ISDN) - Diversion supplementary services - Digital Subscriber Signalling System No. One (DSS1) - Part 1: Protocol specification
Integrated Services Digital Network (ISDN) - Completion of Calls to Busy Subscriber (CCBS) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification
Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Signalling network layer for circuit-mode basic call control - Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 3: Interworking at the Inter-System Interface (ISI) - Sub-part 5: Additional Network Feature for Mobility Management (ANF-ISIMM)
