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.
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?
Thilo
On Mon, 2003-12-29 at 18:22, Andres wrote:
Looks quite useful. It would probably work great with the Grandstream phones since they do include a Header Field which will say if the NAT is Symmetric or not.
What other UA's are you using that include this header field?