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ETSI TS 124 642
M00001462
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ETSI TS 124 642 Digital cellular telecommunications system (Phase 2+); UMTS; LTE; Completion of Communications to Busy Subscriber (CCBS) and Completion of Communications by No Reply (CCNR) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification (3GPP TS 24.642 version 8.11.0 Release 8)
standard by European Telecommunications Standards Institute, 07/01/2013
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