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ETSI TS 129 163
M00004029
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ETSI TS 129 163 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks (3GPP TS 29.163 version 7.28.0 Release 7)
standard by European Telecommunications Standards Institute, 09/01/2013
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