Found out recently that it was not functional. When I get to the call screen, the "record" button is visible, and on clicking it, it says "call recording".
But after the call when I tried to open the recording, the file itself was nowhere to be found. Before I used to get notified as well of the recorded call, now even that is not happening. Inspite of recording many calls, the call recorder folder is empty. Any help on this would be greatly appreciated.