mumble
Low-latency, high quality voice chat software.
TLDR
Open Mumble
$ mumble
Open Mumble and immediately connect to a server
$ mumble mumble://[username]@[example.com]
Open Mumble and immediately connect to a password protected server
$ mumble mumble://[username]:[password]@[example.com]
Mute/unmute the microphone in a running Mumble instance
$ mumble rpc [mute|unmute]
Mute/unmute the microphone and the audio output of Mumble
$ mumble rpc [deaf|undeaf]