TeamSpeak Server  3.0

TeamSpeak is flexible, powerful, scalable software which enables people to speak with one another over the Internet. TeamSpeak consists of both client and server software. The server acts as a host to multiple client connections, capable of handling literally thousands of simultaneous users.
Address book for easier management of multiple TeamSpeak servers
Create multiple channels and sub-channels for your users
Moderate channels for more control when hosting large group meetings
Whisper functions so you can speak privately to inidividuals, groups of persons, or users in other channels