Emergency call telegram transmission, function

In the event of an emergency call, all telephone connections and service calls (MB-Info or roadside assistance calls) currently active are interrupted. The emergency call system control unit (N123/4) sends an emergency call telegram to the nearest emergency call center and then always establishes a telephone connection to the emergency call center. If an emergency call was triggered automatically, but it was not possible to make a connection to the emergency call center, then a telephone connection to the police emergency number ("911") is automatically established. In such case, no emergency call data are transmitted. The emergency call must then be made verbally. For a manual emergency call, the switchover to the emergency call number can be configured as required.

 The emergency call system must be authorized to transmit an emergency call telegram.

Normally, the telephone connections are established via the telephone antenna (A2/22). If the standard telephone antenna should happen to malfunction (A2/22), such as due to a vehicle rollover, there is also a TELE AID backup antenna located in the area of the rear shelf (A2/50). The emergency call system control unit (N123/4) detects the failure of the telephone antenna and then automatically actuates the TELE AID backup antenna (A2/50).