| 摘要 |
PURPOSE:To prevent effectively a mis-calling and a malicious call from other caller to a radio receiver by adopting the constitution that a caller dials a telephone number to call radio reception equipments having the same calling number. CONSTITUTION:A central processing unit 26, in detecting a busy called party, collates the allocated position of the caller and the called party. When the central processing unit 26 detects the coincidence of both and decides whether or not the caller is a subscriber of a radio call service based on the service class information in a subscriber data memory 28. When the caller is a subscriber of the radio call service, the central processing unit 26 connects an outgoing sender trunk 24 and an outgoing trunk 22 and sends the telephone number of the caller as a radio call number to the outgoing sender trunk 24. In receiving the radio called party number, the outgoing sender trunk 24 converts the number into an inter-station relay signal and sends the signal to a radio call equipment via the outgoing trunk 22.
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