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ETSI TS 122 279
M00000801
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ETSI TS 122 279 Universal Mobile Telecommunications System (UMTS); LTE; Combined Circuit Switched (CS) and IP Multimedia Subsystem (IMS) sessions; Stage 1 (3GPP TS 22.279 version 16.0.0 Release 16)
standard by European Telecommunications Standards Institute, 08/01/2020
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