App to record VOIP Calls?

This is more of a general question for everyone. Does anyone know a way to record VOIP calls? (like WhatsApp, LINE etc) I am not referring to regular calls (I know there’s call recorder for that).

I do a lot of language exchanges so I really need a solution. Or maybe I can somehow plug in a mic and that can magically record it? I’m not very technical so I was wondering if anyone knows any solutions to this.

Do you mean in-app calls, from Instant Message apps?
I’ve tried with Call Recorder setting up the Recording Source from Default to Voice Line and Mic It didn’t work. Not even for half of the conversation.
still wondering how to do that recording…