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ETSI TS 129 235
M00001606
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ETSI TS 129 235 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Interworking between SIP-I based circuit-switched core network and other networks (3GPP TS 29.235 version 9.11.0 Release 9)
standard by European Telecommunications Standards Institute, 01/01/2019
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