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ETSI TS 134 229-2 UMTS; LTE; IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); User Equipment (UE) conformance specification; Part 2: Implementation Conformance Statement (ICS) specification (3GPP TS 34.229-2 version 8.6.0 Release 8)
standard by European Telecommunications Standards Institute, 06/01/2010
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