| 摘要 |
PURPOSE:To relieve extremely the load of an operator, by connecting a service trunk simulating a semiautomatic connection comprising the operator and an automatic exchange. CONSTITUTION:The service trunk 70 simulating the procedure of semiautomatic exchange is connected to a line connection terminal of an exchange network device of the automatic exchange 20 at the same way as a semiautomatic exchange board 28. An outgoing subscriber 11 transmits a selecting signal of a semiautomatic call specific number 115+ for countries not automated. The exchage 20 transmits a waiting signal to the subscriber 11 and a command representing the presence of a service request to the service trunk 70, which responds in turn to the command and returns a request receiving command. Further, an answer back code of the service trunk and an answer back request signal of the caller are transmitted succeedingly. |
