I am in the process of setting up a number of Centos 5 Linux based IP PBX's and I need a really good administrators book on the subject.
Though I'm relatively new to Linux based OS's I am an Expert (apologies for trumpet blowing ;-) in Windows Server and Networking so am looking for a Linux book that will help me 'convert' my knowledge without any baby talk.
The book needs to be straight to the point, as I won't need any hand holding regarding how computers work, how networks work, or what TCPIP is. The kinds of things I'd like to bone up on is installing device drivers, familiarity with the file system, how to configure NICs, that kind of thing.
I'm really looking for the definitive administrators guide to Linux (Centos) - but not for dummies.