Abstract: According to one embodiment, an electronic apparatus includes a programmable logic device which loads forming circuit information to form a counter circuit to count a value of the number of times of the system reset and to set an initial value of the counter circuit from a memory device on turning on a power source, counts the value of the number of times of the system reset by the counter circuit for each occurrence of the system reset in a current-carrying state, a processor reads in the value of the number of times of the system reset to be stored in the programmable logic device to determine whether or not the value reaches the predetermined reference number of times, and stops starting processing when the value has reached the reference number of times.

Abstract: A host apparatus incorporates a holding-tone generator. The holding-tone generator generates a holding-tone packet. The holding-tone packet is broadcast, as a broadcast packet, to network telephone terminals. Each network telephone terminal receives the holding-tone packet if it assumes a holding state.

Abstract: According to one embodiment, a printed circuit board for a real-time clock IC includes a plurality of wiring layers sequentially laminated to form one substrata and including at least one layer which forms an oscillator circuit pattern having a crystal oscillator generating a reference signal and an oscillation stabilizing portion which stabilizes and oscillates the reference signal and adjusts the oscillation frequency to a target frequency, and a power supply layer arranged in at least one of a position between the plurality of wiring layers and front and rear surfaces of the substrate, and forming a power supply circuit pattern which supplies electric power to a circuit on the substrate and removing a portion of the power supply circuit pattern which has width not smaller than width of the oscillator circuit pattern in a portion of the power supply circuit pattern which overlaps with the oscillator circuit pattern.

Abstract: Upon providing a new service associated with a key telephone unit to an user system, a customer center periodically acquires communication log information of the key telephone unit, generates suggestion information of an inside comprise, which is optimal to the key telephone unit, on the basis of the communication log information, and automatically transmits that suggestion information to a maintenance personal computer via the Internet.

Abstract: The router unit is built in the main key telephone apparatus, the office line interface function and the independent power supplying function are deleted in the router unit, and the office line interface units and the power supply unit substitute for these functions. The temperature inside the cabinet, the operated state of the cooling fan, and the temperature and operating power supply voltage Vcc of the PC power supply unit, etc. are detected in the CTI personal computer, and these monitor data are transferred to the main key telephone apparatus and analyzed in the main key telephone apparatus, so as to detect abnormality in the CTI personal computer and take necessary measures against the abnormality.

Abstract: To add new functions to key telephone apparatuses, the user PC in the user system transmits a function add request to the customer center. The function add request includes information on the functions to be added and the telephone numbers of the key telephone apparatuses. Then, the customer center accesses the user's key telephone apparatuses via a public network on the basis of the received telephone numbers, acquires function information about the key telephone apparatuses, and determines whether the functions can be added, on the basis of the function information. Then, if the functions can be added, the customer center sends license codes for the functions to be added to the user's key telephone apparatuses via the public network, thereby additionally setting the functions.

Abstract: A host apparatus incorporates a holding-tone generator. The holding-tone generator generates a holding-tone packet. The holding-tone packet is broadcast, as a broadcast packet, to network telephone terminals. Each network telephone terminal receives the holding-tone packet if it assumes a holding state.

Abstract: Upon providing a new service associated with a key telephone unit to an user system, a customer center periodically acquires communication log information of the key telephone unit, generates suggestion information of an inside comprise, which is optimal to the key telephone unit, on the basis of the communication log information, and automatically transmits that suggestion information to a maintenance personal computer via the Internet.

Abstract: The router unit is built in the main key telephone apparatus, the office line interface function and the independent power supplying function are deleted in the router unit, and the office line interface units and the power supply unit substitute for these functions. The temperature inside the cabinet, the operated state of the cooling fan, and the temperature and operating power supply voltage Vcc of the PC power supply unit, etc. are detected in the CTI personal computer, and these monitor data are transferred to the main key telephone apparatus and analyzed in the main key telephone apparatus, so as to detect abnormality in the CTI personal computer and take necessary measures against the abnormality.

Abstract: When adding a new function to a key telephone unit BT, a function addition request is transmitted from a user PC of an user system CM to a customer center CC. The function addition request includes information indicative of the function to be added, a credit number, and a telephone number of the key telephone unit. The customer center CC accesses a credit company CR based on the received credit number, carries out credit research of a user. The customer center CC accesses the key telephone unit BT through a public network PNW based on the telephone number, acquires function information of the key telephone unit BT, judges whether the function can be added based on the function information. If addition is possible, the customer center CC transmits a license code of the function to the key telephone unit BT through the public network PNW, thereby setting the function.

Abstract: The router unit is built in the main key telephone apparatus, the office line interface function and the independent power supplying function are deleted in the router unit, and the office line interface units and the power supply unit substitute for these functions. The temperature inside the cabinet, the operated state of the cooling fan, and the temperature and operating power supply voltage Vcc of the PC power supply unit, etc. are detected in the CTI personal computer, and these monitor data are transferred to the main key telephone apparatus and analyzed in the main key telephone apparatus, so as to detect abnormality in the CTI personal computer and take necessary measures against the abnormality.

Abstract: A system allowing selective connection of various types of external apparatuses to a telephone set, which system comprises a plurality of switching circuits connected to the external apparatuses and a plurality of external apparatus interface circuit having mutually different characteristics and connected through the plurality of switching circuits to the external apparatuses, wherein any one of these switching circuits is turned on and at the same time the other circuits are turned off to selectively connect one of the interface circuits to one of the external apparatuses.