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ETSI TS 122 173
M00005357
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ETSI TS 122 173 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1 (3GPP TS 22.173 version 7.5.0 Release 7)
standard by European Telecommunications Standards Institute, 07/01/2008
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