| 摘要 |
<p>PURPOSE:To offer service for subscribers who want to use telephone set only in night hours without adding any new trunk by making an effective use of excessive lines that are not used in the night collective use. CONSTITUTION:When the time of the day reaches the night hours, the retention storage line on the corporation group telephone system 4-side formed by connecting with subscriber's lines 11, 12 comes as excessive lines that are not used for night collective use, etc. A switch control part 2 controls a switch 2A by a switch control signal from a switch timer part 3 in order to switch the connection between the subscriber's line 11 on the telephone system 4-side and that 12 on the LINK 5-side to the connection between the subscriber's line 13 of a subscriber B and that 12 on the line 5-side. As a result, the subscriber B can request for a connection for a call only during prescribed night hours.</p> |
