Mumble

https://www.mumble.info/

Mumble is a free, open source, low latency, high quality voice chat (VoIP) application.

Basic Info

F-Droid is a robot with a passion for Free and Open Source Software (FOSS) on the Android platform. On this site you’ll find a repository of FOSS apps, along with an Android client to perform installations and updates, news, reviews, and other features covering all things Android and software-freedom related.

Configuration

Additional Resources

https://www.mumble.info/documentation/