Goto Http://ventrilo.com
Download client
install then run
SERVER ID: nyc2.ventriloservers.biz
PORT: 3795
50 man slot server, hosted in new york.
HOW TO START VENTRILO
Create a new user and give yourself a name
(preferably your forum name)
Give your account a phonetic ( name which will be spoken when you connect/disconnect etc)
Now you will be presented with the ventrilo screen,
click the button beside server ( -> ) to add the zeitgeist server
Add the following information into the appropriate fields
IP: Nyc2.ventriloservers.biz
Port: 3795
You do not need to fill in the other fields ( keep all options checked)
Ok, You are now ready to connect to the server, press the CONNECT buton
Now you will see the Ventrilo Server!
Look for the New Zealand Channel Under Chapters!

Now you are ready to Speak ( If you have a microphone)
or chat (if you dont have a Mic)
Now please click the 
Great so now you will see this setup screen,
please assign yourself a Push to talk button,
and tweak your audio settings (Input and output etc)
You can now click the
to enter the text based chat room
Now if you dont have a microphone you can type
Happy Ziwi Chatting!!!!
Please read the following information carefully.
1. When you access the IRC chat server through this web site, your username and email address here will be provided to the server to authenticate your session. You will receive an email confirming your IRC login. If your user name is listed as "Guest," then you do not need to confirm it (applies to users whose user names have spaces, etc)
2. The Forum Rules apply to all communications in the IRC.
Read More Wiki Instructions for IRC