A method, a detection device and a server device for evaluation of a communication arriving via a connecting line at the communication device are provided. Communication information which can be read or determined from the incoming communication is detected by the detection device which is coupled between the connecting line and the communication device, and is associated solely with the communication device. Furthermore, the detection device checks whether the detected communication information matches predeterminable data pattern information, and/or whether a response message to be initiated by the incoming communication from the communication device via the connecting line is absent. If the check result is positive, the detected communication information is stored, and is read out during the course of a central evaluation process carried out by the server device.