| 摘要 |
PURPOSE:To attain a call among three parties without intervening an operator, by providing a means which informs the addition of a call with the third party to an exchanger by an outgoing subscriber, the means which sends a wait tone to an opposite calling person, and the means which couples the call among three parties. CONSTITUTION:To an outgoing subscriber A books on when the call among the three parties including the third party C is required during a call between the outgoing subscriber A and an incoming subscriber B, a hooking signal is sent to a signal controller 12. By the above operation, a controller 12 changes the connection of the subscriber A to a receiver 10, that of the subscriber B to a wait tone trunk 9, and that of the third party C to a sender 11, respectively. Also, the subscriber A, after hooking, dials the subscriber number of the third party C, and the subscriber number of the third party is sent to the sender 11. The sender 11 sends a bit of number information to a succeeding station, and the third part C is connected to an output trunk 8. And all of the trunk 6 of the subscriber A, the output trunk 7 of the subscriber B, and the output trunk 8 of the third party C, are connected to a call coupling device 2. In this way, it is possible to perform the call among the three parties.
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