ETSI TR 101 294
ETSI TR 101 294
Digital cellular telecommunications system (Phase 2+) (GSM); Subjective tests on the interoperability of the Half Rate/Full Rate/Enhanced Full Rate (HR/FR/EFR) speech codecs, single, tandem and tandem free operation (GSM 06.85 version 8.0.0 Release 1999)
standard published 06/01/2000 by European Telecommunications Standards Institute
