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ETSI TS 129 163
M00001581
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ETSI TS 129 163 Digital cellular telecommunications system (Phase 2+) (GSM); 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 11.19.0 Release 11)
standard by European Telecommunications Standards Institute, 01/01/2019
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