Which Code on web tranlate the colibri to SDP?

I am learning the Colibri API on JVB.
I want to start a video conference by calling the JVB colibri API.
by calling the /colibri/conferences/, the JVB return some channel and candidate.
How put them into the SDP on user’s browser client ?

It is jicofo that communicates with the bridge and uses the information from the bridge to make a xmpp jingle call send to the client, from that jingle call (the channels and ports) the client create SDP the logic starts in JingleSessionPC and here: https://github.com/jitsi/lib-jitsi-meet/blob/master/modules/xmpp/JingleSessionPC.js#L947