[Asterisk-Users] SIP & IAX behind NAT

[Roy Sigurd Karlsbakk]

IAX should work well behind NAT without further configuration than just
a single port forward. RTP based protocols such as MGCP, SIP and H.323
require helper agents on the NAT box to work, although SIP can be forced
to work by slightly breaking it.

roy

On Mon, 2003-10-27 at 10:00, Peter Zeltins wrote:
> I'm trying to set up * server behind NAT. The box is set up as DMZ in
> my DSL router, i.e. all incoming connections without explicit port
> mapping are forwarded to *. So far I'm unable to get this setup to
> work for either IAX or SIP (tried IAXComm & XLite softphones on public
> IP address). Data seems to come in fine (IAX/SIP debug shows message
> interaction taking place), but there is no audio.
>  
> Am I missing something in */router setup or such thing cannot be done?
> I suspect that I need to override local IP address being sent out in
> SIP/IAX packets, but I see no such option in either iax.conf or
> sip.conf
>  
> TIA,
> Peter