European digital cellular telecommunications system (Phase 1); Mobile radio interface layer 3; Supplementary services specification; Formats and coding (GSM 04.80)

Standard published on 1.1.1995

Digital cellular telecommunications system (Phase 2+) (GSM); Mobile radio interface layer 3; Supplementary services specification; Formats and coding (GSM 04.80)

Standard published on 30.8.1996

European digital cellular telecommunications system (Phase 1); Mobile Radio Interface Layer 3; Call Offering Supplementary Services Specification (GSM 04.82)

Standard published on 1.1.1995

Digital cellular telecommunications system; Closed User Group (CUG) supplementary services; Stage 3 (GSM 04.85)

Standard published on 15.12.1996

European digital cellular telecommunications system (Phase 1); Mobile Radio Interface Layer 3; Call Offering Supplementary Services Specification (GSM 04.88)

Standard published on 1.1.1995

Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91)

Standard published on 15.2.1996

Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91)

Standard published on 30.3.1996

Universal Personal Telecommunication (UPT); Phase 1; Requirements on Information Flows (IFs) and protocols

Standard published on 30.9.1995

Fifth Generation Fixed Network (F5G); Technical Requirements for FTTR Network Deployment

Standard published on 16.9.2026

Operational energy Efficiency for Users (OEU); Adaptive and multiple output power supplies based on USB Type C with USB PD support

Standard published on 2.6.2025