Automatic redial method for telephone switching system

摘要

A telephone switching system capable of enabling an individualized subscriber phone set of a calling subscriber to dial a stored telephone number, and if a called line of the stored telephone number is busy, to automatically redial the same telephone number at fixed intervals until a ring tone is obtained from the called line of the stored telephone number or until after the telephone number has been redialed a predetermined number of times even when a telephone handset of the subscriber phone set remains "on" hook.