| 摘要 |
PURPOSE:To transmit clearly a variety of service contents by providing a sound synthesizing trunk, writing a message at a memory part and making the message freely selected through the indication of a control part. CONSTITUTION:When subscribers A and B execute the camp-on operation with use of communications links 41 and 42 and a subscriber in the midst of calling also executes said operation with respect to the subscriber A, this operation is detected in a subscriber circuit control part 31 and informed to a common control part 32, whereby the link connection exchange to a sound synthesizing trunk 50 is carried out. On the other hand, when the common control part 2 indicates the transmission of a camp-on service to a trunk control part 51, it indicates a message memory part 52 to select the camp-on service and simultaneously indicates a sound transmitting part 53 to transmit the message to a sound mixing part 54. In case of three minutes' notice service, its three minutes' notice message is informed as a necessary message through a signal line 60. |
