| 摘要 |
PROBLEM TO BE SOLVED: To provide an analog transmission type intercom system with convenience for a user in the interphone system of low-cost analog transmission type. SOLUTION: When conversation takes place between given two sets, such as communication terminals 22, 23, and as an example calling is started from a communication terminal 21 to the communication terminal 22, the communication terminal 21 transmits call information including time data as a control signal to the communication terminal 24 because the line between the communication terminals 22, 23 is busy. When the communication terminal 24 receives the control signal, a message for indicating a call from the communication terminal 21 on the call side is displayed and the call time is also displayed on a monitor screen of a monitor unit 4. COPYRIGHT: (C)2005,JPO&NCIPI
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