Binary package “mumble” in ubuntu trusty

Low latency VoIP client

 Mumble is a low-latency, high quality voice chat program for gaming. It
 features noise suppression, automatic gain control and low latency audio
 with support for multiple audio standards. Mumble includes an in-game
 overlay compatible with most open-source and commercial 3D applications.
 Mumble is just a client and uses a non-standard protocol. You will need
 a dedicated server to talk to other users. Server functionality is
 provided by the package "mumble-server".