| 摘要 |
A dual network telephone device may be configured to selectively perform a telephone communication via a public telephone network and via an IP telephone network. The dual network telephone device may be configured to generate IP telephone identification information for a non-IP telephone device configured to perform a telephone communication using the dual network telephone device via the public telephone network, register to an IP telephone server an association of an IP address of the dual network telephone device and the IP telephone identification information for the non-IP telephone device, receive a first call request sent from the IP telephone server, send a call request notice instruction to the non-IP telephone device on a condition that the first call request includes the IP telephone identification information for the non-IP telephone device as a call request destination, receive IP telephone identification information input to and sent from the non-IP telephone device, send a second call request to the IP telephone server. The second call request includes both the received IP telephone identification information as a call request destination and the IP telephone identification information for the non-IP telephone device as a call request source. Further, the dual network telephone device may be configured to receive a response in reply to the second call request, and transfer voice data, which is sent from the call request source of the first call request or from the call request destination of the second call request to the non-IP telephone device and to transfer voice data sent from the non-IP telephone device to the call request source of the first call request or to the call request destination of the second call request on a condition that a call start operation is operated at the non-IP telephone device in response to the call request notice instruction or the response is a positive response.
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