Adding Custom iptables rule to FreePBX Firewall

@necits2015 wrote:

I need to add a custom rule to the FreePBX Firewall but I'm not exactly sure how to do it. I've enabled "Custom Firewall Rules", created the file /etc/firewall-4.rules, made sure it was owned and writable by root only, and added the rule to the file trying different formats but I can't seem to get it to stick. The rule I'd like to add is

 iptables -I OUTPUT -m string --string "SIP/2.0 503 Service Unavailable" --algo bm --to 65535 -j DROP

(This is related to a Yealink bug regarding transfers but that's for another topic!)

Any suggestions would be much appreciated

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