This Google Chrome Extension is built for FreePBX. It allows you to either highlight a number then right click and select call or click the icon in the extension menu and type or paste in the number to call.
Download Chrome Extension Here: https://chrome.google.com/webstore/detail/bjjgodajjgmjpgjhbphdnjjhpldkgjbk/publish-accepted?utm_source=en-ha-na-us-sk-ext
This will also require you to add a php file to your pbx server to accept the incoming request and to make a manager user which you will enter in the php file.
Download PHP File from github named call.php
Please note that your FreePBX server must have PHP installed.
If you installed the native FreePBX distro you are probably on CentOS and need to run this command:
sudo yum install php
If you are on Ubuntu the command would be:
sudo apt-get install php5
Instructions on how to configure Chrome Extension https://www.youtube.com/watch?v=NgU84smstGg
Instructions on how to configure PHP File https://www.youtube.com/watch?v=_qhy47BBBUE