Yes, while preparing the connection to the control center, the emergency call can be cancelled within 15 seconds by pressing the dguard SOS button several times. The button must be pressed at least twice to cancel.
If it is already too late for the SOS button to stop the call, you can still use your dguard connected headset to inform the emergency control center that you do not need help.
No headset connected? Then you can call the rescue centre on 112 and inform them that no rescue operation should take place.