| 摘要 |
PROBLEM TO BE SOLVED: To provide a call system used for conference call, capable of avoiding the delay of start of call until all the members can respond, allowing even a crew who is not in time for the start of the call to grasp the call content up to that time, and eliminating the wasteful call recording.SOLUTION: A call system includes: three or more call devices capable of enabling simultaneous call; and a central control unit having a call monitoring part for monitoring the call state of the call devices and a conversation recording part for recording the call content. When the call device makes a call to other two or more call devices at the same time, and there is a call device that did not make a response to the call within a prescribed time, the central control unit records the conversation content held between the other call devices until the device unanswered makes a response, and notices the unanswered device of that. |
