| 摘要 |
PURPOSE:To perform accurate call display to subscribers, by providing call signal reception counter at telephone set side and special trunks at exchanger side. CONSTITUTION:When a subscriber SUB dials a visual type call information service special number, an outgoing register PBOR receivers it and transmits the 2nd dial tone to the SUB. After the SUB confirms the 2nd dial tone, it dials a general telephone number. A marker M connects the vacant special call trunk SPT and the SUB with the visual type call service information and the general telephone information. This SPT transmits a call signal from the line C the same as a general trunk when a called party responds, and transmits the call signal after being converted into an MF signal at the same time to the channel corresponding to the SUB, for a given time. This call signal is received and counted at a small size call signal reception counter RC and dispalyed with light emitting components. |
