AI War does not directly support voice chat -- with so many incredible options out there on the PC, it really didn't seem needed. Most of our alpha and beta testing was done with an open Skype conference call (it's best if the Skype host is someone other than the game host), but Teamspeak or the myriad other voice applications out there should also work very nicely. It all depends on what you prefer, if you already have a favorite.
Alternatively, if you'd like to use the official Teamspeak
server that the fine folks over at RTS Universe
have set up for us, here's the server url: ts2.rtsu.net:9000