| 摘要 |
PURPOSE:To improve a service by having the function which transfers an incoming calling from a trunk line to a specific telephone set at the time of a called-extension calling in an automatic private branch exchanger with an individual incoming system. CONSTITUTION:When incoming is executed from a trunk line, an incoming trunk line trunk CICT is connected to an extension subscriber TEL-A through a switch SW by controlling of a central controller CC. When the TEL-A is busy at this time, the central controller CC selects empty subscribers TEL-B-TEL-n inside a white tenant or the empty subscribers TEL-B-TEL-n inside the group which assembles a representative group. However, when the lines of all subscribes concerned are busy, the above-mentioned trunk CICT is connected to a specific telephone set TEL-Z which is not the group decided beforehand through the SW. According to this, the trunk-line incoming can be heard and displayed by the incoming ringing of the specific telephone set TEL-Z.
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