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ETSI TS 124 504 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; TISPAN; PSTN/ISDN simulation services: Communication Diversioin (CDIV); Protocol specification (3GPP TS 24.504 version 8.21.0 Release 8)
standard by European Telecommunications Standards Institute, 07/01/2015
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