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ETSI TS 123 228
M00000213
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ETSI TS 123 228 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); IP Multimedia Subsystem (IMS); Stage 2 (3GPP TS 23.228 version 6.16.0 Release 6)
standard by European Telecommunications Standards Institute, 03/01/2007
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