Digital cellular telecommunications system (Phase 2+) - Adaptive Multi-Rate (AMR) speech transcoding (GSM 06.90 version 7.2.1 Release 1998) (Endorsement of the English version EN 301704 V7.2.1 (2000-04) as German standard)
Edition 2004-03

Digital cellular telecommunications system (Phase 2) - Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 4.1.1) (Endorsement of the English version EN 301248 V4.1.1 (2000-04) as German standard)
Edition 2004-12

Digital cellular telecommunications system (Phase 2) - Full rate speech - Part 3: Substitution and muting of lost frames for full rate speech channels (Endorsement of the English version ETS 300580-3:1998-03 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Full rate speech - Part 6: Voice Activity Detection (VAD) for full rate speech traffic channels (Endorsement of English version ETS 300580-6:1998-04 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Half rate speech - Part 2: Half rate speech transcoding (Endorsement of the English version ETS 300581-2:1998-05 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Half rate speech - Part 7: ANSI-C code for the GSM half rate speech codec (Endorsement of the English version ETS 300581-7:1998-03 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2) - Half rate speech - Part 8: Test sequences for the GSM half rate speech codec (Endorsement of the English version ETS 300581-8:1998-04 as German standard)
Edition 2001-04

Digital cellular telecommunications system (Phase 2+) (GSM) - User-to-User Signalling (UUS) - Service description, Stage 1 (GSM 02.87 version 7.1.2 Release 1998) (Endorsement of the English version EN 301702 V 7.1.2 (1999-12) as German standard)
Edition 2003-08

Digital cellular telecommunications system (Phase 2+) (GSM) - Comfort noise aspects for Adaptive Multi-Rate (AMR) speech traffic channels (GSM 06.92 version 7.1.1 Release 1998) (Endorsement of the English version EN 301706 V 7.1.1 (1999-12) as German standard)
Edition 2003-08

Digital cellular telecommunications system (Phase 2+) (GSM) - User-to-User Signalling (UUS) - Stage 2 (GSM 03.87 version 7.0.2 Release 1998) (Endorsement of the English version EN 301710 V 7.0.2 (1999-12) as German standard)
Edition 2003-08