You can opt to setup your own TURN & STUN Server if you don't want to use any third-party services.

First you have to get a Server to setup your TURN Server.

Read this for minimum server specification required for TURN & STUN Server:

Coturn is a free and open-source implementation of a TURN and STUN server for VoIP and WebRTC.

Its available at

Here are reference articles on how to setup TURN Server with Coturn:

Once installed you get TURN/STUN server url and credentials, you can go to Configuration -> ICE Servers configuration on the app and put the required details.

Or you can hire us to setup STUN/TURN Server for you.