The present invention relates to a method for checking a ring-back signal comprising the following steps, time synchronizing a first device and a second device, causing an event by requesting the configuration of a ring-back signal with and for the first device at a specific time stamp and capturing the time stamp and the event in a first log file, calling the first device with the second device at a specific time stamp, recording the ring-back signal of the first device, comparing the ring-back signal with at least one reference signal yielding a comparison result, and capturing the time stamp and the comparison result in a second log file, and comparing the second log file with the first log file.