This post is not exhaustive. These are the minimum security measures.

1. Block all access to port 5060 and 5080
   1. /sbin/iptables -A INPUT -p udp –destination-port 5080 -j DROP
   2. /sbin/iptables -A INPUT -p udp –destination-port 5080 -j DROP
2. Allow only specific IPs to connect
   1. /sbin/iptables -I INPUT -p udp -s {IP} –destination-port 5060 -j ACCEPT
   2. /sbin/iptables -I INPUT -p udp -s {IP} –destination-port 5080 -j ACCEPT