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Not necessarily, TURN servers should only be required for strict NAT. It seems that 92%* for connections are not behind strict NATs.

*https://developers.google.com/talk/libjingle/important_conce...



STUN fails under symmetric NAT, not strict NAT. That google document makes no citations of that 92% figure, but I assume that's for desktop traffic only. Pretty much all mobile/cellular connections would require TURN too.


I haven't found Verizon or AT&T to need TURN, but maybe clients on them would if connecting to each other.


In my tests with 10 people 5 needed TURN, ISPs in my country are really something special.




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