FreePBX is very flexible and has many calling features. Most of these are deployed as modules that can be added to the system as required.
You should keep the modules on your system up-to-date for security reasons.
First select Module / Module Admin from the main menu
You will see a list of installed modules. Next click Check Online
It’s normally safe to click Upgrade All / Process and apply any updates (you should probably back up your system before doing this – http://sysadminman.net/blog/2013/backing-up-freepbx-5670)
Installing new modules
Installing new modules is the same procedure as above, except once we’ve clicked ‘Check Online’ we can scroll down and select the modules we want to install.