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ETSI EN 300 729
M00001342
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ETSI EN 300 729 Digital cellular telecommunications system (Phase 2+) (GSM); Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels (GSM 06.81 version 6.0.1 Release 1997)
standard by European Telecommunications Standards Institute, 06/01/1999
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