As with most most things internet, goto
www.google.com Then search for ventrilo
Its totally free to download and within our vent we have dark energy rooms. For example if a party is doing a seige and another party in cata, you have split to the two seperate rooms.
For hands free communication, its great and even if you are soloing you still have someone to talk away to.
Once you download it, lots in clan will know how to set up and use. I did it and I am a dummy with that sort of stuff, so you all will have no problem.