| 摘要 |
PURPOSE:To simplify the connection operation by returning the connection sequence of an incoming side private line trunk and an exchange into the dial reception state in case an extension busy state is encountered for the private line incoming connection and a message during extension busy state by a tape is sent to a caller. CONSTITUTION:In case a private line caller TELA dials an extension number and encounters the extension busy state, the caller TELA hooks on a handset in a conventional system and recalling is applied again by the sequence. After the sequence operation, a central processing unit CPU receiving and detecting an extension number identifies the busy state of the extension, then a private line trunk PVT is connected to a talkie trunk (tape service interface trunk) TKT by the closing control of a switch 3. Then a central processing unit CPU of an incoming PBX supervises the timing of a message transmission time, the switch 3 is opened after the end of message transmission to restore the incoming private line trunk PVT to the acquisition start from the private line caller TELA.
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