I'm not really sure I understand your question. What will be done with what?
The dia you've sent is quite clearly showing:
- webrtc client connected via ws/wss socket to the Kamailio
- pure SIP client connected to the Kamailio via any of the transports: UDP / TCP / TLS
- webrtc client uses encrypted audio stream, rtcp-mux and has ICE candidates
- meanwhile pure SIP client uses plain RTP, has no ICE support, and uses two ports for RTP+RTCP (so no rtcp-mux support)
- kamailio keeps control on rtpengine via socket (indeed via module which has NG protocol to send commands to rtpengine's socket)
What is the IP family, is totally of no matter, it can be v4 or v6 depending on your network requirements.
So you have kind of a gate to interconnect webrtc with pure SIP.
What's the question?
Regards,
Donat Zenichev