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ETSI EN 300 970
- Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels (GSM 06.21 version 8.0.1 Release 1999)
- standard by European Telecommunications Standards Institute, 11/01/2000
- Publisher: ETSI
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Updated to version 8.0.0 CRs from SMG#31