Integrated Services Digital Network (ISDN) - Signalling System No. 7 - Digital cellular telecommunications system (phase 2); Application of ISDN User Part (ISUP) version 2 for the ISDN - Public Land Mobile Network (PLMN) signalling interface - Part 1: Protocol specification (GSM 09.12 version 4.2.2) (Endorsement of the English version EN 300646-1 V 4.2.2 (1999-05) as German standard)
Edition 2000-12

Digital cellular telecommunications system (Phase 2+) (GSM) - Subscriber Identity Module (SIM) conformance test specification (GSM 11.17, version 7.0.2, Release 1998) (Endorsement of the English version EN 301086 V 7.0.2 (1999-12) as German standard)
Edition 2003-04

Digital cellular telecommunications system (Phase 2+) - General Packet Radio Service (GPRS) - Service description - Stage 1 (GSM 02.60 version 6.3.1 Release 1997) (Endorsement of the English version EN 301113 V6.3.1 (2000-11) as German standard)
Edition 2005-04

Digital cellular telecommunications system (Phase 2) - Enhanced Full Rate (EFR) speech processing functions - General description (GSM 06.51 version 4.1.1) (Endorsement of the English version EN 301243 V4.1.1 (2000-11) as German standard)
Edition 2004-12

Digital cellular telecommunications system (Phase 2) - ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec (GSM 06.53 version 4.0.1) (Endorsement of the English version EN 301244 V 4.0.1 (1998-01) as German standard)
Edition 2003-11

Digital cellular telecommunications system (Phase 2) - Enhanced Full Rate (EFR) speech transcoding (GSM 06.60 version 4.1.1) (Endorsement of the English version EN 301245 V4.1.1 (2000-08) as German standard)
Edition 2004-12

Digital cellular telecommunications system (Phase 2) - Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 version 4.0.1) (Endorsement of the English version EN 301246 V 4.0.1 (1997-12) as German standard)
Edition 2003-11

Digital cellular telecommunications system (Phase 2) - Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.62 version 4.0.1) (Endorsement of the English version EN 301247 V 4.0.1 (1997-12) as German standard)
Edition 2003-11

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) - Voice Activity Detector (VAD) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.82 version 4.0.1) (Endorsement of the English version EN 301249 V 4.0.1 (1997-12) as German standard)
Edition 2003-11