You might need it. Read here: https://bloggeek.me/webrtc-turn/

Do I need TURN server, when I use #1 Server side recording?

I do not understand what is it for since I forward media stream through media server as TURN server does…

It all depends. First on how you record – separated streams or mixed stream.

And on where you do the processing. In the end, mixed recording is CPU intensive and will be expensive on matter what you do. Handling this on the client side is usually impossible due to a lot of constrains and the fact that you have no control over the environment.

With Android, I’d do recording on the server side (if using the browser), and that solves your question.

Inside an app, well… you have access to all the data so you’ll need to cobble up a solution for that (and even then, I’d probably go for server-side recording).

Ravi,

Such questions are better addressed in discuss-webrtc (https://groups.google.com/forum/?nomobile=true#!forum/discuss-webrtc). I suggest you publish it there.

Nilesh,

I am not sure I understand the question. In most cases, a single peer connection will handle both the audio and the video will be sent and received together. In most cases, on the same SRTP connection.
If the issues you are having are connectivity ones, then first look at your TURN configuration and try understanding your webrtc-internals better. This should be of help: https://testrtc.com/webrtc-internals-documentation/