| 摘要 |
<p>Alarm communication system including one or more alarm transmitters (1) with call function which are in connection with one or more alarm objects (2) which shall be monitored by one or more alarm centra via a telecommunication network, at which each alarm transmitter is allocated a subscriber number. The alarm centre (5) is connected to a place of reception for number presentation (4) which gives network alarm to alarm centra if the continuous 'monitoring calls' are not coming forth.</p> |
