RADIO TELEPHONE SYSTEM

PURPOSE:To allow the user of the radio telephone system to grasp a cause to forced termination of its talking even when the talking is terminated forcibly by raising an alarm tone and displaying the cause to the call termination when the talking is terminated forcibly due to interrupt of a monitor tone from a base station. CONSTITUTION:A radio means 1 demodulates a radio signal received from a base station into a base band signal, a monitor tone detection means 2 detects a monitor tone in the base band signal and if the means 1 cannot detect the monitor tone, the means 1 outputs a count enable signal to a monitor tone interrupt timer count means 4, and the monitor tone interrupt timer count means 4 starts counting the monitor tone interrupt timer. The monitor tone interrupt timer count means 4 outputs a termination request signal to a call termination means 5 at time-out and an alarm tone control signal to an alarm tone generating means 6 and outputs a call termination cause display request signal to a call termination cause display means 7. The call termination means 5 executes the termination of the call to terminate the call forcibly, the alarm tone generating means 6 generates an alarm tone and the call termination cause display means 7 displays the cause to call termination.