Method and a system for silent and non-exposing alerting of previously abandoned calls

A method for silent and non-exposing alerting of previously abandoned calls, wherein the method comprises:

• retrieving, by an emergency system unit, every k seconds, signal data for an abandoned call device from a network carrier, said signal data of the abandoned call device comprising sets of three-dimensional position coordinates (x, y, z) for a time period of k seconds, where ≤30 seconds;
• verifying, by the emergency system unit, if the abandoned call device is moving for a predetermined period of time, by subtracting the three-dimensional position coordinates of the abandoned call device from different sets of three-dimensional position coordinates for different time periods each of k seconds, the abandoned call device being not moving if there is no difference in the sets of three-dimensional position coordinates (x, y, z) for the predetermined period of time;
• marking, by the emergency system unit, the abandoned call device as a potential victim, in case the abandoned call device is not moving for the predefined period of time;
• checking, by the emergency system unit, if for the abandoned call device, a difference z in altitude of at least 5 meters is detected, said difference in altitude being evaluated by subtracting the coordinates zn+1-zn from different sets of three-dimensional position coordinates for different time periods of k seconds;
• and, if yes,
• ending the method.