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ETSI TS 123 231
M00005149
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ETSI TS 123 231 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); SIP-I based circuit-switched core network; Stage 2 (3GPP TS 23.231 version 8.4.0 Release 8)
standard by European Telecommunications Standards Institute, 06/01/2009
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