How'd you guess?
Just so you know, I used to exclusively use RedHat years ago, then they started to have issues with perl and kernel modules and it just got worse until I finally tried Slackware and had much more stability and a slight performance gain over RedHat. Since then we've standardized on OpenSuSE and Ubuntu which we have had very good results with, including not having as messed-up of a stock kernel as compared to CentOS.
In the end, we have fixed dozens of stock CentOS ViciDial systems by wiping out CentOS and installing just about anything else on them. Of course the ViciDialNOW project uses CentOS as a base, but not the stock kernel.