[Asterisk-Dev] How IAX workd behind the firewall

[Adam Hart]

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  
>