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ETSI TS 123 228
M00000529
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ETSI TS 123 228 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS); Stage 2 (3GPP TS 23.228 version 16.6.0 Release 16)
standard by European Telecommunications Standards Institute, 01/01/2021
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