I need to record a conversation during the internet-call - my voice in micro and other voice in headphones.
What options I need switch on, to make this audio-file?
You’ll generally need special software in order to record both sides of the conversation. I don’t do that so maybe someone else can recommend something, or you can Google.
See https://forum.audacityteam.org/t/how-to-record-skype-calls-on-audacity/37074/2 for some apps you cna use.