For any who don't know, many players in the Alien Arena community use an open-source VOIP program called Mumble for in-game voice chat. Both the client software and the server software (called Murmur) are free and run on a variety of platforms.

However, to ensure that everyone had a stable server and a solid connection, [T3]Blindman runs a server that is open for use by entire AA community - also free to the players using it. The server is professionally hosted, so it sounds as clear as any Ventrillo or TeamSpeak server I've ever been on, even when we have lots of players on at the same time.

The server is setup with a main lobby and several sub-channels which can be used for team games.

You can either connect using the DNS address or, if that isn't working for you for some reason, you can use the IP Address. Either way, the port number is the same.
Address: chicago1.mumblevoice.com
IP: 209.212.155.40
Port: 64810

You can download the mumble voice chat client from SourceForge, and you can also find installation and configuration instructions at that site.