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ETSI TS 134 229-1
M00001142
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ETSI TS 134 229-1 Universal Mobile Telecommunications System (UMTS); LTE; Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); User Equipment (UE) conformance spec; Part 1: Protocol conformance spec (3GPP TS 34.229-1 v 15.2.0)
standard by European Telecommunications Standards Institute, 01/01/2020
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