Patent ID: 7236835

Claim:
A remote maintenance system comprising: a communication terminal device; and a center device which is connected to the communication terminal device via a prescribed communication line and monitors a failure in the communication terminal device; wherein the center device includes a storage unit which stores device information of the communication terminal device and a customer information management table, the center device responds to a failure notification signal including the device information from the communication terminal device, refers to the customer information management table, and automatically transmits a call instruction signal to the communication terminal device via the communication line, and the communication terminal device responds to the call instruction signal and notifies the call to a user, wherein after notifying the call to the user, the communication terminal device automatically transmits a center calling signal via the communication line in accordance with an instruction of the user, wherein the center device responds to the center calling signal including the device information from the communication terminal device, refers to the customer information management table, and automatically originates a call to a prescribed telephone number via the communication line to enable communication between the center device and the communication terminal device, wherein when a calling key validation mode is set, the center device automatically originates a call.