Patent ID: 7940919

Claim:
A periodic and automatic telephone redialling method applicable to a dial-type communication device to provide automatic and periodic telephone redialling, the method comprising: receiving a phone number inputted by a user; performing a dialling procedure for this phone number; if the dialling procedure is unsuccessful, allowing the user to set up a redial period for the unsuccessfully dialled phone number prior to switching to a periodic and automatic redial mode; and performing a countdown procedure on the redial period that corresponds to the unsuccessfully dialled phone number, and, each time the redial period is reached, performing a connection status detecting procedure, by detecting whether a Dual Tone Multi-Frequency (DTMF) signal is returned by a communication device to which the phone number belongs, for the unsuccessful phone number in order to determine whether the communication device is connected to the dial-type communication device, wherein, if so, then a redial procedure is performed, and, if the call is still unsuccessful, then the redial procedure is performed every redial period.