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ETSI TS 134 229-1
M00002417
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ETSI TS 134 229-1 UMTS; LTE; Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); User Equipment (UE) conformance specification; Part 1: Protocol conformance specification (3GPP TS 34.229-1 version 13.5.0 Release 13)
standard by European Telecommunications Standards Institute, 04/01/2018
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