[Serusers] Different behaviour from different clients, same firewall.

[Michal Matyska]

Symmetric versus asymmetric RTP session. Check if the UE uses the same
port for transmitting and receiving of the stream... Asymmetric stream
needs device specific port-forwarding to enable it.

I have got one very fresh adventure with this issue. :-)

Michal

On Mon, Aug 07, 2006 at 01:38:18PM -0400, sip wrote:
> What are some things that might create one-way audio issues from different
> clients, all using STUN, all NATted behind the same firewall? 
> 
> Some UAs, I have to add port-forwarding for to ensure two-way audio (they're
> behaving as though they're behind a symmetric NAT). Others, I don't have any
> issues with at all.
> 
> For instance, X-Lite? Always works. Snom? Requires port-forwarding in order to
> function correctly 100% of the time (often works, doesn't always). Grandstream
> (phones and ATAs)? Always works. UTStarCom F3000? Requires port-forwarding to
> function correctly. SJPhone? Always works. Etc., etc.
> 
> All these devices are behind the same firewall, so I don't think it's
> necessarily an issue with the method of NAT that the firewall does. It's
> something that varies inside the UA.  
> 
> Any ideas what, inside a UA, could cause such disparity? I thought it might be
> the SDP headers, but I can't honestly tell MUCH difference between them. 
> 
> I'm at a bit of a loss for all the bizarre variables involved. 
> 
> 
> N.
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