| 摘要 |
A method of monitoring the status of an alarm or security system (10) installed at a facility (F). A sensor (S) responds to the occurrence of a predetermined condition by going into alarm and an indication thereof is communicated to a call center (CC) which forwards the information to a monitoring site (M1-Mn). The monitoring site then processes the information about the status condition and determines what action is to be taken in response thereto. Before forwarding the information to the monitoring site, the call center first sends a protocol message to the monitoring site querying whether or not the monitoring site is available to receive forwarded status condition information. The information is forwarded only if the monitoring site responds affirmatively to the message. Otherwise, the call center either retains and processes the received status condition information, or forwards it to a second monitoring site.
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