I have setup a free public mumble server for the gaming community to use on my server. This particular server is sitting at home on my 1GBps internet connection. It has a nice beefy Xeon & lots of RAM, SSD Primary Drive etc… so I made the server support 350 users.
Server Name: — Free Server sammit.net
No password needed to connect.
You will see this server listed in the public servers list for Japan, as I live in Japan but of course you can use it anywhere in the world depending on your ping.