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ETSI TS 123 279
M00004339
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ETSI TS 123 279 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services; Stage 2 (3GPP TS 23.279 version 11.0.0 Release 11)
standard by European Telecommunications Standards Institute, 09/01/2012
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