| 摘要 |
A communication management device holds a management table that manages users of a first communication device through a sixth communication device connected to a network and status of the users, whether the users are absent or present. When a user A of the first communication device carries out a telephone conversation with a user K of the fourth communication device, the first communication device transmits information of the user K to the communication management device. The communication management device determines whether or not the user K is present in accordance with the management table. When the user K is present, the communication is established between the first communication device and the fourth communication device. Accordingly, unnecessary voice data can be prevented from being transmitted to the network.
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