How OpenVidu detect the Public IP when offering the default ICE Servers address

OpenVidu v2 Issues with deployment
1

If we don’t configure OPENVIDU_WEBRTC_ICE_SERVERS in .env file, OpenVidu will use it’s own coturn service address.
When a webrtc user join room, the server will give the response with the default turn server.
For example:

{
    "customIceServers": [
        {
            "url": "turn:165.225.xxx.xxx:3478",
            "username": "1717062407:24ue9awO",
            "credential": "1V9oCVaXQZS0r89cXh1eQAWdbk8="
        }
    ]
}

Here turn:165.225.xxx.xxx:3478 is generated by the server, and I found the IP 165.225.xxx.xxx is the public address of the company network, because I didn’t configure it anywhere, is it correct? The question is how the server detected this public address as turn server address?
Can anyone help understand this issue? Thanks.

2

OpenVidu Server is able to automatically discover the public IP: openvidu/openvidu-server/docker/utils/discover_my_public_ip.sh at master · OpenVidu/openvidu · GitHub

This strategy works fine for almost any setup. Only a handful of deployments behind heavily-restricted firewalls would need manual configuration.

3

Understood, thanks a lot.