sorry. unless you have KVM access and someone to burn the .iso to a CD (AND put it in and take it out) you are not going to be able to complete this task in that manner.
if you want to have the installation completed, you should either contact Gardo directly (he's the only one who has DEMONSTRATED the ability to be able to install Vicidial on CentOS from scratch, by releasing GoAutoDial). Otherwise, of course, if you start from Ubuntu or OpenSuSE you can probably have The Vicidial Group or one of us others (I work for PoundTeam.com) who can install on these other operating systems.
The Vicidial Group created VICIdial and maintains it, and they explicitly do NOT support CentOS. I've heard of several call centers who successfully installed on CentOS, but none of those do it professionally. If someone claims to be able to do it OTHER THAN GARDO, you should ask for references, and DO NOT PAY until AFTER it works.
In case you ask: I've never met Gardo and have no association, these are merely my observations from the board. I'm not badmouthing anyone else who may make the claim of CentOS installation, because I've never heard of anyone else who claims to be able to do it.
I'm sure Poundteam could do it (where I work), but noone has ever asked us to do so, and since Gardo can ...
Oh: And I DO love CentOS, I began on CentOS and do use it. Just not Vicidial servers.