Make sure the iSymphony V3 packages are installed
From the Linux CLI run "yum -y install iSymphonyServerV3-fpbx"
Make sure you have the latest iSymphony V3 module installed
From the Linux CLI run "amportal a ma upgrade cxpanel && amportal a r"
Add your iSymphony V3 license
From the Admin GUI navigate to Admin --> iSymphony V3
Add your license in the "Activate" field.
Click the Activate button. The screen should refresh with the license details.
If you bought iSymphony from the FreePBX/Sangoma Portal, you can see the license key code by viewing the deployment in the Sangoma Portal.
You may want to disable the older iSymphony v2 if you don't have a license for it, or don't plan to use it.
From the Linux CLI run:
service iSymphonyServer stop
chkconfig iSymphonyServer off
amportal a ma disable isymphony