Thilo Salmon wrote:
The UA in question is indeed a Grandstream phone and I have not seen any others showing this behaviour. On a quest for such agents you can probably skip any agents without STUN support, I guess. Afaik, that does not leave you with too many options. I personally only know about Grandstream, X-ten and Snom. If you know others, I would be very interesting to learn which ones.
Check here for a list, but as of now, it's the same as yours: http://www.voip-info.org/tiki-index.php?page=STUN
On a side: A good start would also to avoid symmetric NATs. I would love to compile a list of routers which operate symmetric NATs to tell my customers to avoid them. I tried a number of residential routers, but all of them did some sort of coned NAT. Who could name symmetric NATs?
Someone started a list here: http://www.voip-info.org/wiki-NAT+survey
It would be great if we could add to that list.
Regards, /Olle