> I'm trying to configure Sipura 2000 (behind NAT) which connects to 
> Asterisk (public IP, no NAT) and having interesting results. When Sipura 
> is behind Linux/NAT firewall it works great and no special NAT settings 
> on Sipura are necessary. The issue I'm having is when Sipura is behind 
> Linksys broadband NAT router. Sipura gets registered with Asterisk just 
> fine, but I can't hear the other party (to be more precise I can hear 
> first two secs then nothing). So it must be the incoming RTP is blocked 
> on Linksys. Here I think STUN server enters the game and give some help?
> 
> I have installed Vovida STUN server and point Sipura to use it. But no 
> luck, I still can't hear the other party. I've ended up with having 
> Linksys to forward all ports to my Sipura (DMZ host) which works.
> 
> What is interesting is that when I'm using Vonage service (Cisco ATA) it 
> works just fine without touching the Linksys. How come they can get 
> through it?
> 
> Any hints?

Add canreinvite=no to the sipura def's in sip.conf


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