Two SIP listening ports for single Asterisk
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There is no way to make a single instance of Asterisk listen on multiple ports. However, you can use an iptables REDIRECT to achieve the same functionality.
To redirect a single port with iptables:
iptables -t nat -A PREROUTING -i eth0 -p udp --dport 5062 -j REDIRECT --to-ports 5060
This example redirects UPD port 5062 to port 5060, which effectively allows Asterisk to listen on both of them.
Remember to save the rule so that it survives a reboot:
/etc/init.d/iptables save
From: http://lists.digium.com/pipermail/asterisk-users/2008-November/221970.html