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 If the system needs to be set to listen on multiple SIP port (e.g. 5060 and 5061):  
 Log in to the system shell as a root user.   
 If you're using Centos, Fedora, or Red Hat, install the iptables 
          yum install iptables
 
 If you're using Gentoo, install the iptables 
          emerge -v iptables
 
 Add the new SIP port (5061) by executing: 
  iptables -t nat -A PREROUTING -p udp -d $YOURPUBLICIPADDRESS --dport 5061 -j DNAT --to $YOURPUBLICIPADDRESS:5060   where $YOURPUBLICIPADDRESS is the actual IP address of your server e.g. 80.65.65.221)
 
  
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