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Whats the need for TURN

Posted on 2016-08-14
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Last Modified: 2016-09-05
HI,
I come across the statement when STUN does not work then we resort to TURN.
whats the reason for this why wont STUN work. I have read up two reasons for this.
1) When UDP is blocked by firewall
2) client is behind symmetric NAT

Please help in explaining why wont STUN work in both of these cases.

Thanks
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Question by:Rohit Bajaj
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noci earned 500 total points (awarded by participants)
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Stun uses UDP packets port 1493 so if those are blocked there is no traffic for STUN and no answer as well.
NAT may cause a different address for STUN as for your VOIP equipment.

There is also a 3rd method for STUN to fail, if a Firewall tries to help voip using an ALG  (Applic. Level. Gateway).
where the ALG wrecks packets in stead of translating them correctly for this mode of operation.
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by:noci
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answer is imho complete
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