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M00004759
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ETSI TS 123 218
Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia (IM) session handling; IM call model; Stage 2 (3GPP TS 23.218 version 10.0.0 Release 10)standard by European Telecommunications Standards Institute, 03/01/2011
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