Mumble is a voice over IP (VoIP) application primarily designed for use by gamers and is similar to programs such as TeamSpeak.

[5] It has a very simple administrative interface and features high sound quality and low latency.

This and the rest of Mumble's design allow for low-latency communication, meaning a shorter delay between when something is said on one end and when it's heard on the other.

Mumble connects to a server via a TLS control channel, with the audio travelling via UDP encrypted with AES in OCB mode.

[9] As of 1.2.9 Mumble now prefers ECDHE + AES-GCM cipher suites if possible, providing Perfect Forward Secrecy.

As of version 1.0, users could upload avatars to represent themselves in the overlay, creating a more personalized experience.

[21] It is intended for installation on embedded devices with limited resources, such as, for example, residential gateways running OpenWrt.

The configuration file holds information for the server's name, user authentication, audio quality restrictions, and port.