Abstract: 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.

Abstract: An angle adjustment apparatus for an electronic device according to the present invention can be inexpensively formed by a compact and simple structure and readily assembled and disassembled. When a telephone set as an electronic device is in a small inclination position, auxiliary plates are substantially in parallel to supports of a leg. Tips of the auxiliary plates are brought into abutment against right surfaces of the first projections. Click portions of the supports are brought into abutment against left surfaces of the second projections. Accordingly, the supports cannot be further rotated counterclockwise with respect to the base. When the telephone set is in a large inclination position, the auxiliary plates are perpendicular to the supports. The tips of the auxiliary plates are brought into abutment against the engagement portions of the base. The click portions of the supports are located between the first projections and the second projections.