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ETSI TS 129 228
M00004018
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ETSI TS 129 228 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia (IM) Subsystem Cx and Dx Interfaces; Signalling flows and message contents (3GPP TS 29.228 version 9.12.0 Release 9)
standard by European Telecommunications Standards Institute, 09/01/2013
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