Yealink VC Series Administrator's Manual

Also see for VC Series: Quick start guide

Contents

Administrator‘s Guide for Yealink Video Conferencing Systems142The callee receives the INVITE message with the RTP encryption algorithm, and thenanswers the call by responding with a 200 OK message which carries the negotiatedRTP encryption algorithm.The following is an example of the RTP encryption algorithm carried in the SDP of the200 OK message:m=audio 11780 RTP/SAVP 0 101a=rtpmap:0 PCMU/8000a=rtpmap:101 telephone-event/8000a=crypto:1 AES_CM_128_HMAC_SHA1_80inline:NGY4OGViMDYzZjQzYTNiOTNkOWRiYzRlMjM0Yzcza=sendrecva=ptime:20a=fmtp:101 0-15The SRTP parameter on the system is described below:Parameter Description Configuration MethodSRTPSpecifies the SRTP type for the SIPaccount. Disabled—do not use SRTPin SIP calls. Enabled—negotiate with thefar site whether to use SRTPfor media encryption in SIPcalls. Compulsory—compulsoryuse SRTP for mediaencryption in SIP calls.Default: DisabledWeb User InterfaceRules of SRTP for media encryption in SIP calls:Far Near Compulsory Enabled DisabledCompulsory SRTP Call SRTP Call Fail to establish callEnabled SRTP Call SRTP Call RTP CallDisabled Fail to establish call RTP Call RTP Call