| 摘要 |
PURPOSE:To answer to an originator without keeping the originator waiting even if plural trunk lines are DIL-set to one telephone set in a night mode by attaining incoming information even if the destined telephone set to be called informed by a means (DIL) for informing a specific trunk line incoming to a specific telephone set is in busy. CONSTITUTION:If there is an incoming in the trunk line 14 dealing with DIL termination when the telephone set 13 of the destined DIL termination and other trunk line or the telephone set 15 are connected through a channel 19, a channel connection equipment 11 temporarily and simultaneously connects the channel 19 and a channel connected to an interruption sound source 16, and transmits a termination informing sound 'pee' to the telephone set 13 of the destined DIL termination. Namely, the termination informing sound is set to interrupt in the telephone set in busy, and incoming instruction is given. Consequently, trunk line incoming can be informed without cutting the call in busy, and responce to the incoming is attainable without ending the call being proceeding at present by hooking but with temporarily holding it. Thus, the profit of the user is improved without troubling the originator.
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