Make sure you are not behind a Symmetric NAT. If so, you're dead. STUN does not work with Symmetric NAT.
If a UA is behind Symmetric NAT, and UA use STUN, and SER have [RTP/Media]Proxy to handle Symmetric NAT, this UA should be fine, right?
Yes, but, if UA is behind symmetric NAT, I would not configure STUN to it. I'd just led mediaproxy solve the problem.
But if you have 100 clients, it would be hard to put all clients in one group.
Good point !
Yes, it is true. If stun can not solve the nat problem, media proxy should fix it with no trouble at all.
Regards,
Lucas