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ETSI TS 124 229
M00004462
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ETSI TS 124 229 Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 (3GPP TS 24.229 version 5.26.0 Release 5)
standard by European Telecommunications Standards Institute, 03/01/2012
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