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ETSI TS 124 628 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Common Basic Communication procedures using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification (3GPP TS 24.628 version 15.0.0 Release 15)
standard by European Telecommunications Standards Institute, 06/01/2018
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