In the event of an accident, an emergency call is automatically placed, e.g., if an airbag is deployed. The car will then automatically connect to the Audi emergency call centre, and transmit the GPS position, driving direction, and number of passengers. If it is not possible to contact the persons in the vehicle by telephone, emergency services will be notified. If there is a medical emergency in the car, the call can also be triggered manually via the eCall button in the roof module. This service is safety-critical and therefore cannot be switched off.