Wusz.org provides its own Teamspeak3 server - For free, now and forever. :-)
After installing the Teamspeak3 client, you can connect using the following link. The server is still in a test phase, so we still working on permissions and channels. Depending on the utilization a license can be added to allow more than 32 users.
TeamSpeak is a proprietary voice-over-Internet Protocol (VoIP) application for audio communication between users on a chat channel, much like a telephone conference call. Users typically use headphones with a microphone. The client software connects to a TeamSpeak server of the user's choice, from which the user may join chat channels.
The target audience for TeamSpeak is gamers, who can use the software to communicate with other players on the same team of a multiplayer game. Communicating by voice gives a competitive advantage by enabling players to keep their hands on the controls.