FreePBX is a web-based open-source graphical user interface (GUI) that manages Asterisk, a voice over IP and telephony server. ... FreePBX is a community of developers and contributors who devote their work to making complicated phone system software easy to use and functional.
As you can see In this video i'm connecting FreePBX directly to the insternet for faster installation, configuration, activation and updatesand . FreePBX firewall will not be installed because after installation it will be connected inside my ASA firewall which seems to me redundant.