| 摘要 |
PURPOSE:To attain an efficient call while eliminating ineffective shart of a radio base station by designating a call zone so as to prevent a call at a zone where no subscriber exists. CONSTITUTION:A caller request party 1 raises a call, a call comes to a radio call exchange 5, a reception trunk 7 is connected and a call number is received. The number is confirmed by a central controller 8 and stored in a call number storage section 10 of a main storage device 9. When the controller 8 discriminates it as the absence of an additional number, the controller 8 reads all digits of the call number from the storage section 10, uses the number as an index to make a call, and when the call zone registered in advance in a zone storage section 11 is known, and an outgoing trunk 15 of said zone A and a radio base station 13 are detected. Then a call number is sent immediately to a signal device 17 to connect the signal device 17 and the outgoing trunk 15. The signal device 17 converts the call number into number information used by a radio line 18 and it is sent to the base station 13 via the outgoing trunk 16. Thus, the radio call is attained. |
