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ETSI TS 126 102 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Mandatory speech codec; Adaptive Multi-Rate (AMR) speech codec; Interface to Iu, Uu and Nb (3GPP TS 26.102 version 7.1.0 Release 7)
standard by European Telecommunications Standards Institute, 07/01/2007
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