Do not share your login information with others, as you will not only be responsible for their actions, you maybe subject to disciplinary actions for them!
Host: mumble.aie-guild.net Port: 64738 (default)
Use your UMAMI username and password to log into Mumble. If you are a recruit who has not gone through the UMAMI process, use the access token provided by your game officers (usually in the MOTD).
Get Mumble (SourceForge link)