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ETSI - European Telecommunication Standard Institute(ETSI) produces globally-applicable standards for information and telecommunication technologies (ICT) including land, mobile, radio, converged, broadcast and internet technologies.
Digital cellular telecommunications system (Phase 2+) (GSM); Unstructured Supplementary Service Data (USSD); Stage 3 (GSM 04.90 version 7.0.1 Release 1998)
Standard published on 12.1.2000
Selected format:Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91 version 5.1.2)
Standard published on 30.5.1997
Selected format:Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91 version 6.0.1 Release 1997)
Standard published on 1.9.1999
Selected format:Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91 version 7.0.1 Release 1998)
Standard published on 12.1.2000
Selected format:Digital cellular telecommunications system; Modulation (GSM 05.04 version 5.0.1)
Standard published on 15.5.1997
Selected format:Digital cellular telecommunications system; Modulation (GSM 05.04 version 5.1.1 Release 1996)
Standard published on 30.6.2000
Selected format:Digital cellular telecommunications system (Phase 2+) (GSM); Modulation (GSM 05.04 version 6.0.0 Release 1997)
Standard published on 9.3.1999
Selected format:Digital cellular telecommunications system (Phase 2+) (GSM); Modulation (GSM 05.04 version 6.1.1 Release 1997)
Standard published on 20.6.2000
Selected format:Digital cellular telecommunications system (Phase 2+) (GSM); Modulation (GSM 05.04 version 7.0.1 Release 1998)
Standard published on 12.1.2000
Selected format:Digital cellular telecommunications system (Phase 2+) (GSM); Modulation (GSM 05.04 version 7.1.1 Release 1998)
Standard published on 20.6.2000
Selected format:Latest update: 2025-08-04 (Number of items: 2 211 733)
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