Abstract: Methods for detecting faults in a siren-based alert system include receiving, by a siren device from a central siren controller, an activation command. The activation command identifies a neighbor siren device that is to be activated. Audible alerts output by the neighbor siren device include a unique identifying characteristic associated with the neighbor siren device. The method includes determining that the unique identifying characteristic is not detectable by the siren device and, in response, taking corrective action. The corrective action includes the siren device sending a siren fault notification to the central siren controller indicating a failure to detect the unique identifying characteristic and may also include modifying the audible alert output by the siren device to compensate for the faulty siren device. The siren device may send a siren fault notification to the central siren controller if an unexpected audible alert, such as a potential false alarm, is detected.

Abstract: Methods for detecting faults in a siren-based alert system include receiving, by a siren device from a central siren controller, an activation command. The activation command identifies a neighbor siren device that is to be activated. Audible alerts output by the neighbor siren device include a unique identifying characteristic associated with the neighbor siren device. The method includes determining that the unique identifying characteristic is not detectable by the siren device and, in response, taking corrective action. The corrective action includes the siren device sending a siren fault notification to the central siren controller indicating a failure to detect the unique identifying characteristic and may also include modifying the audible alert output by the siren device to compensate for the faulty siren device. The siren device may send a siren fault notification to the central siren controller if an unexpected audible alert, such as a potential false alarm, is detected.

Abstract: Described are methods and devices for receiving a missed message signal, detecting an ambient noise level, determining whether the ambient noise level is at least at a predetermined ambient noise threshold value based on the detected ambient noise level. When the ambient noise level is determined to be at least at a predetermined ambient noise threshold value the methods and devices include processing missed message alert data of the missed message signal for annunciation of missed message alert data. Processing can include storing the missed message alert data to wait for the ambient noise level to be low enough so that an annunciation of the missed message is audible over the ambient noise. Annunciation of a message alert can be, for example, by audio signal output when the ambient noise is low enough that the alert may be heard by the user.