Package mumble

Voice chat suite aimed at gamers

http://www.mumble.info

Mumble provides low-latency, high-quality voice communication for gamers.
It includes game linking, so voice from other players comes
from the direction of their characters, and has echo
cancellation so that the sound from your loudspeakers
won't be audible to other players.

General Commands (Section 1)
mumble
Mumble is a low-latency, high quality voice chat utility for gaming that runs under X11.