Here is a step-by-step tutorial for installation of CentOS 6.5 from the CentOS Minimal Install ISO. This gets you the standard PIAF partitions rather than LVM partitions which are difficult to backup and restore.
After booting from the ISO...
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A serious FreePBX vulnerability has been reported. Update your Framework Module immediately. Click here for details.
Critical FreePBX vulnerability! Update your server immediately. Details here.