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ETSI TS 123091-V17.0.0
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Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service; Stage 2 (3GPP TS 23.091 version 17.0.0 Release 17)
Standard published on 12.4.2022
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ETSI TS 123091-V18.0.0
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Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service; Stage 2 (3GPP TS 23.091 version 18.0.0 Release 18)
Standard published on 14.5.2024
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ETSI TS 123091-V19.0.0
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Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service; Stage 2 (3GPP TS 23.091 version 19.0.0 Release 19)
Standard published on 15.10.2025
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ETSI TS 123091-V3.1.0
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Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service - Stage 2 (3G TS 23.091 version 3.1.0 Release 1999)
Standard published on 28.1.2000
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ETSI TS 123091-V3.2.0
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Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service - Stage 2 (3GPP TS 23.091 version 3.2.0 Release 1999)
Standard published on 31.10.2000
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ETSI TS 123091-V4.0.0
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Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service - Stage 2 (3GPP TS 23.091 version 4.0.0 Release 4)
Standard published on 31.3.2001
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ETSI TS 123091-V4.1.0
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Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) Supplementary Service; Stage 2 (3GPP TS 23.091 version 4.1.0 Release 4)
Standard published on 30.9.2002
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ETSI TS 123091-V5.0.0
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Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) Supplementary Service; Stage 2 (3GPP TS 23.091 version 5.0.0 Release 5)
Standard published on 30.6.2002
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ETSI TS 123091-V5.1.0
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Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) Supplementary Service; Stage 2 (3GPP TS 23.091 version 5.1.0 Release 5)
Standard published on 30.9.2002
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ETSI TS 123091-V6.0.0
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Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) Supplementary Service; Stage 2 (3GPP TS 23.091 version 6.0.0 Release 6)
Standard published on 31.12.2004
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