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+) - Substitution and muting of lost frames for Adaptive Multi Rate (AMR) speech traffic channels (GSM 06.91 version 7.1.1 Release 1998) (Endorsement of the English version EN 301705 V7.1.1 (2000-04) as German standard)
Edition 2004-03

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+) - Discontinuous Transmission (DTX) for Adaptive Multi-Rate (AMR) speech traffic channels (GSM 06.93 version 7.3.1 Release 1998) (Endorsement of the English version EN 301707 V7.3.1 (2001-03) as German standard)
Edition 2006-01

Digital cellular telecommunications system (Phase 2+) (GSM) - Voice Activity Detection (VAD) for Adaptive Multi-Rate (AMR) speech traffic channels - General description (GSM 06.94 version 7.1.1 Release 1998) (Endorsement of the English version EN 301708 V 7.1.1 (1999-12) as German standard)
Edition 2003-08

Digital cellular telecommunications system (Phase 2+) - Link Adaptation (GSM 05.09 version 8.0.1 Release 1999) (Endorsement of the English version EN 301709 V8.0.1 (2000-10) as German standard)
Edition 2005-04

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

Digital cellular telecommunications system (Phase 2+) (GSM) - User-to-User Signalling (UUS) - Stage 3 (GSM 04.87 version 7.0.2 Release 1998) (Endorsement of the English version EN 301711 V 7.0.2 (1999-12) as German standard)
Edition 2003-08

Digital cellular telecommunications system (Phase 2+) - Adaptive Multi Rate (AMR) speech - ANSI-C code for the AMR speech codec (GSM 06.73 version 7.4.1 Release 1998) (Endorsement of the English version EN 301712 V7.4.1 (2000-09) as German standard)
Edition 2006-01

Digital cellular telecommunications system (Phase 2+) (GSM) - Test sequences for the Adaptive Multi-Rate (AMR) speech codec (GSM 06.74 version 7.0.3 Release 1998) (Endorsement of the English version EN 301713 V 7.0.3 (2000-10) as German standard)
Edition 2003-08