JPS6084091A - Main wire incoming connection system - Google Patents

Abstract

PURPOSE:To decrease reduction of a waiting time to a caller by connecting a main wire incoming call not responded for a prescribed time to an incoming register so as to allow a caller itself to dial a pulse additionally thereby being connected directly to a desired called party. CONSTITUTION:When a response is obtained within a prescribed time, a response supervisory timer 4 informs it through an information transfer path (b) to a central controller 3 that the response supervisory timer is made ineffective and the response is detected. If no response is obtained within a prescribed time, the response supervisory timer 4 informs non-response information to the central controller 3 through the information transfer path (b). The central controller 3 receiving the non-response information from the response supervisory timer 4 cancels the main wire incoming display to a main wire attendant board 2, connects the incoming main wire trunk 1 to an incoming register (IR)5, a dial tone DT is transmitted from the incoming register 6 to the caller via the trunk line so as to urge an additional dial.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a central office line termination connection system in an automatic private branch exchange.

Conventionally, in the case of an automatic private branch exchange using a relay stand type or a distributed type automatic private branch exchange (TI connection), there was a continuous unresponsive state for incoming calls to the central office line due to the absence of the operator of the relay stand or the called person on the extension line. If this occurs, the caller must either continue waiting or try again.

An object of the present invention is to provide a central office line terminating connection system that can eliminate such inconveniences for callers receiving calls to an automatic private branch exchange via a central office line. The connection method is such that when a response monitoring device connected to the central office line trunk detects that there is no response to an incoming call to the central office line trunk for a certain period of time, the central office line trunk and the incoming call register are connected and a call is made. It is characterized by allowing the caller to dial additional numbers and connect directly to the desired called party.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a diagram of a relay system in which a response is monitored for terminating (1-+2) calls on a central office line using a relay stand system, and FIG. 2 shows a diagram of a relay system after no response has been received for a certain period of time.

In Figure 1, when a call is received from a telephone housed in the central office exchange via °C1 office line C00, the terminating office line trunk (ICT)
An incoming call is displayed on the °C office line relay stand (A i” T ) 2 via the central office line relay station 1.The explanation of this connection process is omitted as it is a well-known technique.The office line to the office line relay stand 2 When the incoming call display is completed, the central control unit (CC) 3 transmits the accommodation position information of the incoming station line trunk 1 and the response monitoring timer setting information to the response monitoring timer device (AT) through the information transmission path a.
MtJ) set to 4. The response monitoring timer device 4 is
Based on the above information received from the central control unit 3, the response from the office line relay board 2 to the terminating office line trunk 1 is monitored through the information transmission path C. When a response is detected within a certain period of time, the response monitoring timer device 4 disables the response monitoring timer and notifies the central control device 3 through the information transmission path that a response has been detected. Having received the response detection information, the central control unit 3 restores the response monitoring timer device 4 and connects the terminating office line trunk 1 and the responding office line relay board 2 via the communication path network (SW) 5. Here, if a response cannot be detected within a certain period of time, the response monitoring timer device 4 notifies the °C central control device 3 of non-response information through the information transmission path. The central control unit 3, which has received the non-response information from the response monitoring timer device 4, cancels the display of the incoming call on the office line relay board 2 as shown in FIG.
) 5, the incoming call register 6 opens the central office line to the caller and sends a C dial tone DT to prompt additional dialing. After that, when the caller dials the extension number etc. that the caller wishes to connect, the incoming call register 6 accumulates the number of sets, activates the central control unit 3, and sends the caller (internal dispute) phone). If the called party C1 answers, a connection is established between the called party, the terminating office line trunk 1, and the calling party.

As explained above, according to the present invention, by connecting an incoming central line call that has not been answered for a certain period of time to the incoming call register, the calling party can make additional dials and be directly connected to the desired called party. This makes it possible to improve services such as reducing waiting time for speakers.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams of a relay system according to an embodiment of the present invention, and Figure 1 shows silk fabrics in the case of the relay resultant type. FIG. 2 is a block diagram showing a state in which a response to an incoming call is being monitored, and a state after no response for a certain period of time. l・Pa... Incoming station line trunk (IC'l'), 2...
...Station line relay stand (A 'l"l'), 3...
... Central control unit (CC), 4 ... Response monitoring timer device (ATMU), 5 ... Call path network (S
W), 6... Incoming call register (I 几).

Claims (1)

[Claims] When a response monitoring device connected to the central office line trunk detects that there is no response for an incoming call to the central office line trunk for a certain period of time, it connects the central office line trunk to the incoming call register and monitors the caller. A central office line terminating connection system that enables additional dialing and connects directly to the desired called party.