| 摘要 |
PURPOSE:To save the number of truck lines used for the entire tenant by extracting a selection number of an extension to an incoming call from a trunk line, reading a tenant number corresponding to the selected number from the tenant number table and applying incoming display to the tenant to eliminate the split loss. CONSTITUTION:When an incoming call comes to a trunk line incoming trunk BWT, a central processing unit CPU receivers an selection number of an extension, e.g., '123'. Further, the central processing unit CPU refers to the item of the selection number '123' in the tenant number table INNCNV to obtain the tenant number, e.g., '2'. The central processing unit CPU, based on the tenant number '2' obtained, applies the incoming display by its lamp and a signal tone to a trunk line display panel COID2 in the tenant TN2 directly. When a reply such as a special number dial comes from an extension EXT2 in the tenant TN2 in response to the incoming call, the trunk line incoming trunk BWT and the extension EXT2 through a channel NW to apply reply connection to the trunk line incoming call.
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