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

[Andres]

On Monday 29 December 2003 12:57, 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.
ATA186(fw 3.0.0) and Sipura SPA2000 both have STUN Support.  I have asked for 
this "Header" feature to Sipura and they are thinking about it.
>
> 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?
Linux NAT is symmetric and is quite common with small businesses.  We use the 
RTPProxy in these cases.

Andres.
>
> 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?