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ETSI TS 134 229-1
M00005333
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ETSI TS 134 229-1 Universal Mobile Telecommunications System (UMTS); Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Part 1: Protocol conformance specification (3GPP TS 34.229-1 version 7.3.0 Release 7)
standard by European Telecommunications Standards Institute, 10/01/2008
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