Excellent.
So I went to /var/lib/ombutel/firewall_zones/
Since I know this is a french IP, I edited fr.zone and added to the top:
163.172.205.0/24
Then I went to my vitalpbx portal and untagged France, save/apply. then tagged again, save/apply to insure that it would reload the file, and BOOM – they’re blocked.
Works perfect