| 摘要 |
PURPOSE:To inform a charge object time to a caller while a call tone used to call a terminal equipment designated by a dial signal during talking is distinguished from a usual call tone in a public line in the communication system connecting to a public line network CONSTITUTION:A voice generator 3 is provided to a master device 1, and when the master set 1 calls one of terminal equipments 4,9 whose call is designated by a general telephone set 8 via an exchange 7, a voice message and a call tone generated by a voice generator 3 are returned to a general telephone set alternately or in mixture to inform the calling state for the charge object time. |
