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ETSI TS 122 173
M00003614
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ETSI TS 122 173 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Core Network Systems (IMS) Multimedia Telephony Service and supplementary services; Stage 1 (3GPP TS 22.173 version 12.9.0 Release 12)
standard by European Telecommunications Standards Institute, 04/01/2015
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