There is a Pause Call Blocker button on the home screen right under your Doosra number. When clicked you will be presented with 2 options. Time and Location. Select an option based on your requirement and tap the red pause button.
Time - When selected, you will be able to receive all calls to your Doosra number for 60 minutes, after which the Call blocker goes back into Block mode once again.
Location - When selected you will be able to receive all calls to your Doosra number around your current location. Once you move beyond a certain distance from your location, the Call blocker goes back into Block mode once again.
Permanent - For users on a PRO plan, the call blocker can be switched OFF indefinitely.