| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a line switching device and an intercom system equipped with the same that are easily introduced. <P>SOLUTION: The line switching device 20 which controls a connection of a plurality of lines includes a line holding unit 4 which holds a connection of a line 1 in a standby state for a certain time when there is a calling from the line 1, a line calling invitation unit 8 which transmits a message, requesting a calling-back to the line 1, to a line 2 made to correspond to the line 1 when there is the calling from the line 1, and a line control unit 5 which connects the line 1 and line 2 to each other when there is the calling-back from the line 2 while the line holding unit 4 holds the connection of the line 1. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
