I have installed Ventrilo server onto my WHS ages ago and did not post a how to on this site. The Ventrilo chat server works well.
Go to http://ventrilo.com/download.php and download the Server program for Windows, this is named “Windows i386 – 32bit (Version 3.0.3)”, this will be the Server, when you are here (if you have not already) download the client program that suits your computers on your network.
Login to your server via Remote Desktop Connection or directly.
Step by Step install guide
Double click on the .exe file of the Ventrilo server.
Click the “Next” button, on the installer.