Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 11: Supplementary services stage 2; Sub-part 17: Include Call (IC) (Endorsement of the English version EN 300392-11-17 V 1.1.2 (2002-01) as German standard)
Edition 2003-04

Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3; Sub-part 17: Include Call (IC) (Endorsement of the English version EN 300392-12-17 V 1.1.2 (2002-01) as German standard)
Edition 2003-04

Intelligent Network (IN) - Intelligent Network Application Protocol (INAP); Capability Set 2 (CS2) - Cordless Terminal Mobility (CTM); Stage 3 specifications for Service Control Function (SCF); SCF and Call Unrelated Service Function (CUSF)/Service Switching Function (SSF) (Endorsement of the English version EN 301143 V 1.1.4 (1999-09) as German Standard)
Edition 2001-09

Information technology - Database languages - SQL - Part 3: Call-Level Interface (SQL/CLI) (Adopted ISO/IEC 9075-3:2016, fifth edition, 2016-12-15)
Edition 2018-01-01

Information Technology - Telecommunications and Information Exchange Between Systems - Broadband Private Integrated Services Network - Inter-Exchange Signalling Protocol - Basic Call/Connection Control
Edition 2001-02-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Specification, Functional Model and Information Flows - Call Transfer Supplementary Service
Edition 2004-12-01

Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Specification, functional model and information flows - Call completion supplementary services
Edition 1997-02-28

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Inter-Exchange Signalling Protocol - Call Transfer Supplementary Service
Edition 2004-01-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Inter-Exchange Signalling Protocol - Call Completion Supplementary Services
Edition 2004-12-01

Information Technology - Telecommunications and Information Exchange Between Systems - Private Integrated Services Network - Specification, Functional Model and Information Flows - Call Diversion Supplementary Services
Edition 2004-12-01