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ETSI EN 300 727
M00001344
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ETSI EN 300 727 Digital cellular telecommunications system (Phase 2+) (GSM); Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.61 version 6.0.1 Release 1997)
standard by European Telecommunications Standards Institute, 06/01/1999
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