| 摘要 |
PROBLEM TO BE SOLVED: To confirm the state of telephone lines accommodated in a switch without the manual intervention of an operator or the like. SOLUTION: The system includes a mail server 19 that applies transmission reception processing to electronic mail, a busy investigation server 15 that is connected to the mail server 19 via the Internet 18, identifies a telephone line of an investigation object on the basis of contents of electronic mail when receiving the electronic mail whose contents inquire about whether or not a specific telephone line is busy from the mail server, and makes a request of investigation of a line state as to whether or not the identified telephone line is busy, and a controller 12 that investigates the state of the specific telephone line on the bass of request from the busy investigation server and reports the result of investigation to the busy investigation server, and the busy investigation server 15 creates electronic mail used to report the investigation result of the state of the specific telephone line and transmits the electronic mail to an inquiry source via the mail server.
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