Digital cellular telecommunications system (Phase 2+) - Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 8.0.1 Release 1999)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - Voice Activity Detector (VAD) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.82 version 8.0.1 Release 1999)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - In-band control of remote transcoders and rate adaptors for full rate traffic channels (GSM 08.60 version 7.2.1 Release 1998)
Edition 2000-12-01

Digital cellular telecommunications system (Phase 2+) - Full rate speech - Comfort noise aspect for full rate speech traffic channels (GSM 06.12 version 8.0.1 Release 1999)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - Full rate speech - Discontinuous Transmission (DTX) for full rate speech traffic channels (GSM 06.31 version 8.0.1 Release 1999)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - Full rate speech - Voice Activity Detector (VAD) for full rate speech traffic channels (GSM 06.32 version 8.0.1 Release 1999) (incl. Diskette!!!)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - Half rate speech - Substitution and muting of lost frames for half rate speech traffic channels (GSM 06.21 version 8.0.1 Release 1999)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - Half rate speech - Comfort noise aspects for the half rate speech traffic channels (GSM 06.22 version 8.0.1 Release 1999)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - Half rate speech - Discontinuous Transmission (DTX) for half rate speech traffic channels (GSM 06.41 version 8.0.1 Release 1999)
Edition 2001-02-01

Digital cellular telecommunications system (Phase 2+) - Half rate speech - Voice Activity Detector (VAD) for half rate speech traffic channels (GSM 06.42 version 8.0.1 Release 1999)
Edition 2001-02-01