Ports to Open on Firewall for FreePBX

To get Freepbx to work behind a firewall you have to open the following ports:

SIP -  UDP port 5060
RTP - UDP ports 10000-20000
IAX - UDP port 4569

You can change the ports for RTP by going to the freePBX admin console and opening the Settings, SIP Settings menu:

The documentation recomends using 10000 ports for RTP to avoid audio problems when the pbx is highly utilized.

The documentation also recomends using 100001 as the starting port if you utilize webmin.

The origional documentation canbe found at the following site:

http://wiki.freepbx.org/display/TROUB/NAT+Configuration+FreePBX+12