| 摘要 |
An integrated communication system comprises a first communication device connected to a second communication device using a data link. When the first communication device is out of network, a dispatch center can indicate to the use a communication is waiting or wanted by sending a communication request signal to the second communication device. The second communication device transmits the communication request signal to the first communication device over the data link alerting the user of the first communication device to the requested communication.
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