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In WebRTC, TURN server is only used to establish a data channel. After that, data transfer us peer-to-peer.

https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API/...






That's incorrect. What you're describing is STUN, when it works. TURN is what is used when peer-to-peer remains impossible. All data transfer is via the TURN server.



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