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http://www.voip-info.org/wiki/view/Asterisk+firewall+rules
# SIP on UDP port 5060. Other SIP servers may need TCP port 5060 as well
iptables A INPUT -p udp -m udp -dport 5060 -j ACCEPT
# IAX2- the IAX protocol
iptables A INPUT -p udp -m udp -dport 4569 -j ACCEPT
# IAX - most have switched to IAX v2, or ought to
iptables A INPUT -p udp -m udp -dport 5036 -j ACCEPT
# RTP - the media stream
iptables A INPUT -p udp -m udp -dport 10000:20000 -j ACCEPT
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# SIP on UDP port 5060. Other SIP servers may need TCP port 5060 as well
iptables -A INPUT -p udp -m udp --dport 5060 -j ACCEPT
# IAX2- the IAX protocol
iptables -A INPUT -p udp -m udp --dport 4569 -j ACCEPT
# IAX - most have switched to IAX v2, or ought to
iptables -A INPUT -p udp -m udp --dport 5036 -j ACCEPT
# RTP - the media stream
iptables -A INPUT -p udp -m udp --dport 10000:20000 -j ACCEPT
# MGCP - if you use media gateway control protocol in your configuration
iptables -A INPUT -p udp -m udp --dport 2727 -j ACCEPT
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