ETSI EN 300 725-1999 Digital Cellular Telecommunications System (Phase 2+); Test Sequences for the GSM Enhanced Full Rate (EFR) Speech Codec GSM 06.54 Version 6.0.1 Release 1997
2000ETSI EN 300 725:2000 Digital Cellular Telecommunications System (Phase 2+); Test Sequences for the GSM Enhanced Full Rate (EFR) Speech Codec (GSM 06.54 Version 7.0.1 Release 1998)
1999ETSI EN 300 725-1999 Digital Cellular Telecommunications System (Phase 2+); Test Sequences for the GSM Enhanced Full Rate (EFR) Speech Codec GSM 06.54 Version 6.0.1 Release 1997