Hi Philippe,
Did you ever considered that he has a running system???
An upgrade to the Freepbx 13 would be devastating and can ruin his PBX. Furthermore, the new 13 version is unstable yet, and I am gentle with you.
can you explain on what authority you would recommend not upgrading to 13 and not using the new firewall?
You must be joking and I would not respect that in a decent answer.
And let me finish with a personal attitude:
The new firewall module of Rob is a blessed thing, and I even shared with him my scripts for protecting the Asterisk and Linux environment. But never the less it will take a long time to test and evaluate the new behavior of the firewall module.
Thank you,
Daniel Friedman
Trixton LTD.