| 摘要 |
PROBLEM TO BE SOLVED: To dial-lock a radio telephone system by means of the transmission of a password by means of a dial key (PB) from a public telephone set and the like by providing a control means for setting the system in a dial locked state when the password by means of a multifrequency signal (TDMF signal) is received. SOLUTION: When the radio telephone system is called from the PB-type public telephone set, a control circuit 4 receives an incoming cell and generates a calling sound from a calling sound generation part 9. When the ringing sound is generated for the setting number of times, which is previously decided, the control circuit 4 stops the generation of the calling sound for the calling sound generation part 9. The password for dial locking for the input of a storage part 8 is inputted by using PB of the public telephone set after the sound is recognized. A DTMF signal by the depression of PB is received in a DTMF identification circuit 7 from an antenna 1 through a radio part 2 and a base band circuit 3. The control circuit 4 compares whether the received number is the password stored in the storage part 8, and dial-locks the radio telephone system when they are matched. |
