[Asterisk-Users] SIP + NAT = horrible mess

[Kim Lux]

I was expecting to have to port forward too and yet our setup doesn't
require it, not on the laptop nor on the wireless router. 

I think as long as the SIP clients open a port on the NATing device and
keep them open so the SIP provider can connect to it, all is well, even
if STUN isn't used.  

I was surprised by how easy it was to NAT the Grandstreams.  I had
visions of having every device being assigned a static IP and having a
fistful of port forwards assigned to them on the router.   



On Fri, 2005-01-28 at 06:54 +0800, Leo Ann Boon wrote:
> > After days of fiddling, I can't really get my SIP device to work 
> > communicate with Asterisk behind NAT. Sometimes the STUN server is 
> > flaky, sometimes the device isn't reachable if the connection is 
> > dropped and then put back on, sometimes it registers OK, sometimes
> it 
> > doesn't, etc.
> 
> I think you'd better use a SIP proxy with NAT traversal support. I'm 
> using SER with their NAT helper module, it allows the phones to
> connect 
> from behind most NAT devices. It's not a 100% solution. There're
> still 
> cases where we need to do port forwarding on the NAT.
-- 
Kim Lux,  Diesel Research Inc.