What open-source video chats or VOIP with an android client exist with the ability to host their own version?

Question

Android

Hello, you need a completely private connection with the ability to independently deploy to your server and the presence of a client for Android. Something like Mumble. Video is a plus.
Thank you.

Answer 1

SipSimple client. Asterix type server.

Answer 2

Video conference.
Available in source.
https://www.loowid.com/

Answer 3

Elastic 5. They left asterisk for 3cx. Didn't use it myself. There are even video conferencing.