Sending Audio Only from server and Audio + Video from Android

I have problem and I can't figured out how to solve it.
I want to send only audio from web client, and it is quite easy, because I can stop it in main.js But than I have problem on Android side. Video doesn't work and it is starting to be audio only. I've tried everything but can anyone tell me where to look for solution?

Other thing is that audio from Android device works only on Audio Only communication, where video is used also, there is problem and only video stream is send.

Start by reproducing the two reported cases: audio-only from the web client and audio plus video from Android. Inspect the web client's main.js and the Android-side media handling, then verify that audio and video are both transmitted correctly when requested and that audio-only mode remains audio-only.

Written by the indexing model from the issue text.