| 摘要 |
PURPOSE:To attain the earlier setting of a camp-on call by informing the end of call of a party to be registered to a busy registering party if the registering party is busy in detecting the end of call of the party to be registered registering a camp-on call. CONSTITUTION:Suppose that an extension 5 is in talking with an extension 6 and busy information (b) in an extension data 41 provided corresponding to the extension 5 is set in the busy state (logic '0') in a main storage device 4. After an extension 7 makes a call to the extension 5 in this state and recognizes that the called extension 5 is in the busy state, when the extension 7 executes the said camp-on registration, a central processing unit 3 starts a camp-on device 31 to set the registration information cs in the extension data 42 corresponding to the calling extension 7 into the registration state (logic '1'), stores the extension number n5 of the called extension 5 and informs the end of registration of camp-on requested to the calling extension 7 in an audible signal tone or the like.
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