ETSI PRETS 300 581-3-1995 European Digital Cellular Telecommunications System; Half Rate Speech Part 3: Substitution and Muting of Lost Frames for Half Rate Speech Traffic Channels (GSM 06.21) was changed to ETSI ETS 300 581-3-1995 European Digital Cellular Telecommunications System; Half Rate Speech Part 3: Substitution and Muting of Lost Frames for Half Rate Speech Traffic Channels (GSM 06.21; Version 4.0.2).
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