Abstract: A supervised, interactive alarm reporting system includes a local terminal comprised of a supervised derived channel communicator, and a one-way radio communicator (preferably via the cellular telephone network), which are connected by a control unit which provides for interactive operation of the derived channel unit and the radio transmitter according to alarm conditions which may arise at the premises, and the existing condition of the equipment comprising the local terminal unit. The local terminal unit is capable of communicating with a central monitoring facility, or mobile units (patrol vehicles or service vehicles) associated with the central monitoring facility, for enhanced security of the monitored premises. Also an alarm reporting system for a mobile site including a local terminal which communicates with a monitoring facility (fixed or mobile) via the cellular telephone network.