For those who do not know already, I am also running a Mumble-Server.
Mumble is a free-open-source voicechat alternative, to other things like Teamspeak or Skype. It is a practical thing, the only disadvantage is, that it is server-based, so you need a server or use someone elses. So due to the lack of good free servers, I made one my own.
So if you are searching for a free Mumble-Server or just want to talk with me or other random people from the internet you can use it, you can also get your own rooms with full admin permissions in it, just ask an admin for it.
Adress is the same as this domain, just enter it as adress, port is the default one, username can be chosen by you. The description can also be freely chosen, but this is the real name for the server under which it also can be found in the mumbles public list, there it is located under: europe/germany/
Here is a little picture for visualization purposes:
Visit it in the communication-section for more information.