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ETSI TS 129 163
M00004324
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ETSI TS 129 163 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks (3GPP TS 29.163 version 6.12.1 Release 6)
standard by European Telecommunications Standards Institute, 10/01/2012
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