The call recording feature of Galaxy S Duos GT-S7562 is disabled by Samsung in some countries like India etc, you should root your phone, use these settings to record calls:
- Record Mode: 34
- Tune Samsung1: No
- Tune Samsung2: No
- Tune Samsung3: No
- Tune Audio Route: No
- Change Audio Controls: Yes
- Change Audio Driver: Yes
- Start Input Stream: No
Now your phone records calls perfectly in two directions, this is the only solution that works well.
All other recorders don't work even with root.