Burn CentOS and asterisk in a CD

Dear all, I feel bore to install the CentOS, yum upgrade, asterisk, dahdi and the iepbx program over and over again. Is there anyway to embeded the Centos, yum upgrade package, asterisk and iepbx program to a CD so that I don’t need to install over and over again?

Anyone who know, please help.
Thanks in advance

I think it could be done… but i don’t know.

I suppose that Asterisk-now could be good for this…

You can also make an image of an installed system if you have to install it on a similar machine.