The Mumble client's server, Murrmur, allows for external authenticators. The goal is to get a server instance running that you need to use your ACM login to access rather than having a shared key. Required LDAP information will be provided upon request. This is some Python code found that is supposed to impliment this functionality, but I have been unable to get it to work correctly. You can either fix this one or figure out how to write your own authenticator for Murrmur
https://www.skelleton.net/2014/10/16/setting-up-an-active-directory-authenticated-mumble-server/
http://wiki.mumble.info/wiki/Main_Page
http://wiki.mumble.info/wiki/Authenticators
https://github.com/mumble-voip/mumble-scripts/tree/master/Authenticators/LDAP