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ETSI TS 129 231
M00000868
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ETSI TS 129 231 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Application of SIP-I Protocols to Circuit Switched (CS) core network architecture; Stage 3 (3GPP TS 29.231 version 16.0.0 Release 16)
standard by European Telecommunications Standards Institute, 07/01/2020
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