[Serusers] Re: RESOLVED - nathelper / calling UAs behind symmetric NATs

[Jiri Kuthan]

At 06:57 PM 12/29/2003, 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.

iptel will have such soon, I will be happy to take any inquiries off-line.

>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?

sipphone.com maintains a list of such NATs. for example, linux nats are 
symmetric.

-jiri