| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to efficiently perform remote control of a main device from a communication terminal 3 by simple operation.SOLUTION: A communication terminal 3 transmits a control request mail in which a control command including a mode name of a control mode, start date and time, and end date and time are described in association with an extension number, to a main device 1. The main device 1 registers the control command described in the received control request mail in association with the extension number described in the control request mail and monitors the arrival of start date and time and end date and time of the control command. When detecting a control command whose start date and time has arrived, the main device 1 starts processing of the control mode specified by the control command with respect to a key telephone 2 specified by the extension number registered in association with the control command. When detecting a control command whose end date and time has arrived, the main device 1 terminates processing of the control mode specified by the control command with respect to a key telephone 2 specified by the extension number associated with the control command. |
