Matt Pagan:
There still exists a bug in Mumble such that when network connections are routed through a proxy they leak DNS requests. This past month I've been reading QT documentation so that I can understand the Mumble code better and find the bug. After the meeting on IRC, velope suggested that fixing it might be as simple as implementing SOCKS5 with hostname. DNS leaks also occur with HTTP proxies, which shouldn't happen. See also: http://sourceforge.net/p/mumble/bugs/1033/
It's not as simple as implementing SOCKS5. Mumble contains a custom async resolution logic. The code is not great to follow, that's why I stopped the effort of trying to write a fix once Mikkel Krautz acknowledged the issue.