Technically Ventrilo isn’t an addon. It’s an external program you can use in conjunction with World of Warcraft.
From Wikipedia – Ventrilo:
Ventrilo is a proprietary VoIP program which allows users to talk to each other, similar to a telephone conference call, but the conference call is made via VoIP. A microphone and speakers, or a headset, must be connected to each person’s computer to use the program.
For the most part you setup your Ventrilo client software, connect to a Ventrilo server and it just works. In some cases you’ll need to fiddle some of your settings so that you sound the best and have the least amount of feedback. I’m not an expert on this and really I’ve just sat in vent fiddling dials and then demaning “How’s it now?” until it got to the point where it sounded good.
That said, there are a few special (non-obvious) things you can setup.
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