| 摘要 |
PROBLEM TO BE SOLVED: To provide a private branch exchange in which other extension number, extension main number, call specific number of a group, an originator forcible disconnection specific number, an unanswered transfer destination of the originator forcible disconnection specific number or an incoming time can be set by a dial operation from an individual extension telephone, the degree of the freedoms of the unanswered transfer for setting the unanswered transfer destination or the incoming time is wide at each originator subscribing number (caller number) from a net and handleability and convenience are excellent. SOLUTION: The private branch exchange comprises a channel switch 2, a controller 3, a storage unit 4 having an incoming time set table 6, an unanswered transfer destination table 7, an unanswered transfer ID table 8, and an agent table 9, a control bus BL, an extension interfaces IN to INn, outside line interfaces IG1 to IGk, and channels P1 to Pn, rp to rk.
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