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ETSI TS 122 250
M00000804
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ETSI TS 122 250 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Group Management; Stage 1 (3GPP TS 22.250 version 16.0.0 Release 16)
standard by European Telecommunications Standards Institute, 08/01/2020
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