[Asterisk-Dev] How IAX workd behind the firewall

twisted twisted at indigent-networks.com
Sun Jul 11 19:11:57 MST 2004


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




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