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Secure Asterisk Server

iptables -A INPUT -p udp -m udp --dport 10000:20000 -j ACCEPT
# This has to be port open on rtp.conf

iptables -A INPUT -p udp -m udp --dport 5060 -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 5038 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 1720 -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

And reject all