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TURN is needed in *some* cases, not always. UDP hole punching (and true p2p) often does work for clients sitting behind simple home routers and similar equipment. There is no magic behind this technique and it’s not a scam. But right - AFAIR Google itself used to admit in the early days of Hangouts service that about 10% of all calls required TURN.

Also, the whole thing is really overengineered so it can be hard to find out why ICE protocol yields this or that result.
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fiatjaf 1y ago

I don't buy that. I would say it's more like 10% _don't_ require TURN.

In any case, the point is that the requirement of TURN isn't mentioned in any of the newbiew guides "let's make video streaming directly from your browser" and has been that way since always.

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nobody 1y ago

There always should be a reason for the need of TURN. Like symmetric NAT. Or routing of all traffic via a VPN service, which can effectively have the same effect as symmetric NAT.