Ubuntu Firewall

Ubuntu includes ufw (uncomplicated firewall) by default, but it is not enabled.

Configure the Uncomplicated FireWall via CLI
sudo su ufw allow ssh ufw allow http ufw allow https ufw allow 1719/udp ufw allow 1720/tcp ufw allow 3478/udp ufw allow 3479/udp ufw allow 5002/tcp ufw allow 5003/udp ufw allow 5060 ufw allow 5061 ufw allow 5070 ufw allow 5080 ufw allow 5081 ufw allow proto udp from any to any port 16383:32768
 * 1) for Fusion
 * 1) for FreeSWITCH

ufw enable ufw logging on ufw status Happy Firewalling!

More Information
https://help.ubuntu.com/10.04/serverguide/C/firewall.html

https://help.ubuntu.com/community/UFW man ufw