Shailender Sharma , Nov 27, 2020 : https://forums.oneplus.com/threads/...-call-recording.1276482/page-49#post-22335291
Shailender Sharma , Nov 27, 2020 : Nope! Not possible. Check out the link in my above post for answers.
avil25 , via OnePlus Nord Blue Marble , Nov 27, 2020 : It will be available once the call is connected