Across the last few days myself and a colleague have been trying to setup cPanel and a PBX on the same server, due to clashing configs and requirements and such, to start with, this seemed difficult.
So, we've restarted and re-installed the server several times. I decide to install cpanel first.
So, we update centos, and grab a coffee. Next we install the base group and such, then install cpanel. Here we have a rather long coffee break depending on your hardware.
Coffee break over.
Time to add tho...