Or use VICIDIALNOW.
It is based on Centos. Pop the CD wait for it to boot up, press enter to install. Grab a coffee, check your emails and when you get back it is installed and you just need to configure your sip providers and phones.
That is if you really want to use centos as your Linux Distro. (Im still using it too)
Then try vicibox also. It is based on Ubuntu which is based on Debian. A lot of people swears by the performance of Debian and ViCiDial. The distro vicibox is made by the Vicidial Group (which maintains the VICIDIAL open source project)
In the end it doesnt really matter what you use. Its how you can plan for it and how can you handle the headaches that come with the job
Plus, Get the Agent and Manager's Manual. The manual saved my ass multiple times. ( Yes I read the manuals when needed)
Get paid for US outbound Toll Free calls. PM me. visit https://stopmanualdial.com for vicidial services.