Trixbox recommends a minimum of a 2.4 GHz processor and 512 MB of RAM. However, given the decline in price of hardware components as well as your possible need to enable certain resource-demanding features such as call recording, you might want to get 2 GB of RAM and if possible, a Dual-Core CPU. The amount of RAM required has a direct correspondence with how heavily used the system will be. As Trixbox is Asterisk with a few other services added, we can pretty much scale it similarly. We do have to consider extra resources for the additional services we have running, such as the web server and the MySQL server.
Trixbox comes in an ISO image that can be burned and installed as a full OS. The ISO installs a modified CentOS system automatically and sets up the necessary Trixbox services.
We can obtain the ISO from http://www.trixbox.org/downloads.
After downloading and burning the image to disk, reboot the target machine with the Trixbox CD in the drive...