Telecommunication system and method enabling a user to get access to an automated call processing from a central station operating on pulse dialling mode

摘要

The present invention is related to a telecommunication system and method enabling a user to get access to any of automated call processing systems. The system comprises in combination a telephone line interface means adapted to provide function of a telephone set, a control means connected to the telephone line interface means, and adapted to constantly monitor the telephone line, analyze a call progress and a ring back tone signals and to switch automatically without human intervention from a pulse dialling mode to a DTMF dialling mode upon detection of a ring back signal validated by a central office. This system also includes a handset and keypad means connected to a telephone interface means and the control means. The central office processes calls in a pause dialling mode. The system enables the user to get access to automated call processing systems, the access to which is limited only to callers equipped with a DTMF telephones and central office base DTMF services. The telephone interface means are adapted to detect the presence of a ring signal on the telephone line, wherein the ring signal is indicating a receiving call mode. The control means are adapted to detect the presence of a ring back signal, wherein the ring back signal is indicating a placing call mode.