I have upgraded my Rasberry Freepbx to version 13. This went well. When I try to install the Firewall the module administration gives the following message:
Publisher: Sangoma Technologies Corporation
License: AGPLv3+
Signature Status: Unknown (What Does this Mean?)
Description: Integrated FreePBX Firewall. Currently works with RHEL 6 and RHEL 7 compatible distributions. Note: This requires the Sysadmin RPM. Please see wiki for further information.
More info: Get help for System Firewall
Missing Requirements:
The File "/usr/lib/sysadmin/includes.php" must exist.