How to determine if TURN server is being used (WebRTC)?

Question

I want to gather stats on the number of users having to fallback to TURN servers. Thus is there a way to find if a RTCPeerConnection is using a TURN server instead of "directly" communicating with a remote peer?

I've tried using pc.getStats() but that only gives me an object with a size property.

Answer 1

You want to use getSelectedCandidatePair. This will return the local/remote candidate that is being used. Each candidate will have a type host, srflx, prflx or relay. relay means it is using TURN.

Make sure to check both candidates. It is possible that both pairs are TURN (or maybe just one)