| 摘要 |
A communication system switches a communication state from a first communication state where a communication device performs data communication and voice communication with an external device, a first phone device, and a second phone device to a second communication state to perform the voice communication between the communication device and the second phone device and the data communication between the first phone device and the external device, when the voice communication is started using the second phone device in response to a call from a communication line. The second communication state is set when a first-phone-device network ID is used for the communication device, a communication-device network ID is used for the first phone device, and a party device of the second phone device is set to a device identified with the first-phone-device network ID.
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