METHOD AND CIRCUIT FOR PREVENTING UNAUTHORIZED CALLS

摘要

The mischief call repulsing circuit sends howling tone to a mixchievous transmitter. The circuit includes a repulsing switch (SW) to send howling tone to a transmitter through a communication loop (20) by connecting a first line (101) and a second line (102) through a capacitor, a repulsing tone transmitting terminal (TXI) for sending a howling tone to a communication loop, and a muting terminal (MT) for muting a howling tone input to a receiver speaker. The method for sending repulsing tone comprises steps: (A) checking a repulsing button input; and (B) sending a repulsing tone.