Some people have asked us whether they can route call traffic so it doesn't go over VPN. The IP addresses involved in a WebRTC call are dynamic, so you can't use IP based QoS rules, unfortunately.
However, we are recommending to use investigate other methods to detect WebRTC traffic (i.e. using Layer 7 rules rather than Layer 4 rules).
We've actively learning and would be grateful for feedback about approaches that have worked!