[Asterisk-Dev] How IAX workd behind the firewall

[twisted]

On Mon, 2004-07-12 at 04:28, Adam Hart wrote:
> IAX uses a single port (4569 udp) - firewalls are different to NATs and 
> IAX's ability to get through is entirely dependent on the firewall 
> rules. Same goes for SIP although there is 2 ports in that case
> 
> Shanmuganathan Kumaravel wrote:
> > Hi there,
> > 
> >     Can anyone suggest, how IAX works behind the firewall. Also is it possible to do the SIP crossing the firewall.
> > 
> > Regards
> > Shan  
> > 

Actually, with SIP you will need 3 ports.   1 for control (5060) and two for RTP.

-josh