Mumble
 
Mumble is our preferred choice for voice chat. Even if you don't have a microphone you can still use mumble to chat with those with microphones. Everything you type will be dictated to other members. 
 
Mumble Client: Windows, OSX, and Linux (You can also find mumble on Android Market and the iOS App Store.)
 
 
Server Info
Address: armshq.org
Port: 49572