| 摘要 |
PURPOSE:To offer call waiting service, by connecting a common line terminal to either one of line terminals constituting one group, only when the common line circuit is vacant. CONSTITUTION:To a plurality of line terminals of call waiting class among subscribers SUB, a call waiting service device CWRG having one call waiting service interruption terminal is commonly provided. The connection of either one of line terminals with the call waiting service interruption terminal is made by selectively operating either one of connector relays CN0-CN4 corresponding to the line terminals included in the call waiting service device CWRG with the transfer information from a number group NG. |
