| 摘要 |
An IP telephone set 4 is provided with a power failure adapter 5. During power failure, a function of the power failure adapter 5 is enabled so that the IP telephone set 4 is connected to an analog network 3 via the power failure adapter 5. As a result, the IP telephone set 4 is allowed to perform telephone communication via the analog network 3. The IP telephone set 4 includes an emergency call detecting portion 40a and a transmitting portion 40b The emergency call detection portion 40a detects that an emergency telephone number is dialed as a dialed emergency telephone number. The transmitting portion 40b enables the function of the power failure adapter 5 when the emergency call detecting portion 40a detects that the emergency telephone number is dialed and transmits the dialed emergency telephone number to the analog network 3 via the power failure adapter 5.
|
