[Asterisk-Users] SIP + NAT = horrible mess

[Leo Ann Boon]

Jean-Michel Hiver wrote:

> Hi Guys,
>
> 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.

>
> I've come to the same conclusion as the wiki: it's probably better to 
> avoid this horrible mess by either using IAX or doing VPN. Letting the 
> IAX option aside, are you aware of any SIP devices that support some 
> simple, easy to use VPN protocol?
>
> Cheers,
> Jean-Michel.
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