[Asterisk-Users] Sipura 2000 behind NAT issue, Vonage is working

[David Hajek]

Hi,

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?

--
David Hajek
http://hajek.net/blog