| 摘要 |
PURPOSE:To simplify the transfer operation by allowing a transfer party to make holding operation, using an INTERCOM to make a call individually to a person desired to be transferred and transferring the call to a transfer destination party through hook-off only. CONSTITUTION:When a user depresses a holding key while one of telephone sets connected in parallel is busy through an external line, a state control section 108 makes an external line holding with an external line holding section 102 and when a telephone number of an extension telephone set desired to be transferred is dialed, a call command of the extension telephone set is outputted to a command transmission section 111. When an extension set number is the same as its own set number, a state storage section 110 is busy with the extension and a call section 109 generates a call tone. When the transfer party hooks on, a transfer command to the external line is outputted to the telephone set during calling of the extension from the command transmission section 111. The transferred party revises the state storage section 110 from the extension call to the external line transfer and when the telephone set is hooked off, the transfer is finished by using an external line selection section 104 to select the external line. |
