JPS6081997A - Trunk line incoming call answering system - Google Patents

Abstract

PURPOSE:To prevent delay of answering for temporary concentrated incoming of a trunk line by answering to a incoming trunk line from an extension subscriber when the trunk line incoming call becomes congestion during operation of a cordless trunk line repeater board in the daytime. CONSTITUTION:A monitoring circuit SPU that decide congestion of the trunk line incoming call when unanswered call out of all incoming call exceeds a fixed number is provided. Every time trunk line incoming connecting operation is made, presence of output that indicates congestion of the trunk line incoming call from the SPU is identified by a central controlling unit CC, and when there is congestion of the trunk line incoming call, incoming indication is given to a trunk line indicator board CLD from the station repeater board ATT and the circuit SPU. By this way, answering is made possible by either answering operation from the ATT or off hook operation of extension subscriber EXT.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a central office line incoming call response system in an automatic private branch exchange that employs a distributed relay system for incoming calls.

Conventionally, in automatic private branch exchanges that employ a distributed relay system for incoming calls, incoming calls are answered by operating a button on the untethered central office line relay stand or by dialing an extension telephone. For example, when answering an incoming call on the central office line during the day, the operator of the central office line relay stand can operate the answer button.
At night, when an extension subscriber dialed or otherwise operated the telephone, the incoming station line was answered.

However, since the conventional distributed relay system is a switching system, when the central office line relay system operator (during the day) starts responding and becomes persistent, the extension subscriber cannot respond, and the switch is made so that the extension subscriber responds. There is a drawback that when the station line relay board operator is unable to respond, and when the station υ incoming calls are busy, there is a delay in responding to incoming calls, which increases the load on the central office line relay stand operator. Ta.

The purpose of the present invention is to make it possible for extension subscribers to respond to incoming calls by dialing an extension telephone, etc., at a critical moment when the number of incoming calls to the central office line becomes busy during the operation of a cordless central office relay stand. It is therefore an object of the present invention to provide a central office line incoming call response system that can prevent response delays to incoming calls and reduce the load on the central office line relay stand operator.

In order to achieve the above object, the central office line incoming call answering system according to the invention is based on the central office line incoming call answering system in an automatic private branch exchange that adopts a distributed relay system for incoming calls. A monitoring circuit is provided that determines that there is incoming call congestion on the central office line when the number reaches a certain level, and each time a central control unit that controls the entire exchange performs an incoming call connection operation on the central office line, the monitoring circuit detects incoming calls on the central office line. It is determined whether there is an output indicating the width of the line, and the incoming call lI+! If there is an incoming call, the central office line relay board and the monitoring circuit give an incoming call indication to the central office line display panel, so that even if there is a misunderstanding in the response operation from the central office line relay board or the extension subscriber's handset off-hook operation, the answer can be prevented. It is configured as possible.

According to the above structure, the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a block diagram of an automatic private branch exchange using a distributed relay system to which a central office line incoming call response system according to the present invention is applied.

When a call is received from the central office line, an indication of the incoming call is displayed on the central office line trunk ATT from the receiving central office line trunk Cl0T. Here, the unit constantly monitors how many unanswered calls there are among all incoming calls (
If the number of unanswered calls reaches a certain number when the number of unanswered calls reaches a certain number, the monitoring unit S'PU determines that there is a congestion of incoming calls on the central office line, and prepares to transfer the information to the central control unit 100. Each time the central control unit Co performs an incoming call connection operation on the display panel OLD, it either connects the incoming office line to the office line relay board or connects the incoming office line to the office line relay board, depending on the presence or absence of an output from the monitoring unit SPU. Make a decision on whether to connect to.

When there is an output from the central control unit 00 (monitoring unit) 8PU, in other words, in the case of a central office line incoming call response method, it is sent from the four-channel central office line trunk 0IOT to the central office relay stand ATT, and from the monitoring unit 8PU to the central office line display panel. An incoming call is displayed on the OLD screen.

When the station line relay stand operator responds to the incoming call display on the station line relay stand ATT, operate the response button and the station line relay stand A'l'T will respond.
The central control device 00 is activated from the central control device ATTO corresponding to the central control device ATTO, and the button information is transferred.

The central control unit 1i00 is connected to the incoming station line trunk 0I.
Select OT and follow the route ■ to the central office line relay board controller ATTO.
The switch SW between the terminating office line trunk 0IOT and the terminating office line trunk 0IOT is closed to enable communication between the office line subscriber and the office line relay stand operator.

On the other hand, the extension subscriber (
If the IBXT) answers, go off-hook the handset and
Transmission Register OR Direct IB After confirming the dial tone, dial the central office line response number. After the dial meter a registers line -x+1 in the calling register OR, it activates the central control unit OC and transfers the caller information and the dialed number information.

The central control device CC is the incoming station line trunk 0'IO
T is selected, and the switch SW between the extension subscriber EXT and the terminating office line trunk 0IOT is closed via the route (3) to enable a call between the office line subscriber and extension subscriber 1 (XT).

If the central office line relay stand operator and the extension subscriber gXT perform response operations at the same time, the central control unit CO performs the central office line incoming call connection in accordance with a predetermined priority order.

In addition, when the output from the monitoring unit SPU goes off to the central control unit 00, that is, under normal conditions, an incoming call is displayed from the receiving office line trunk 0IOT to the office line relay stand ATT (
There is no incoming call display on the station line display panel OLD).

The response from the office line relay stand operator is as described above.

As described above, the invention leads to the prevention of response delays and the reduction of the load on the operator of the central office line relay stand when a temporary concentration of calls is received on the local central office line.

As explained in detail above, during the daytime operation of an untethered central office line relay stand, when an incoming call to the central office line becomes congested, the present invention enables extension subscribers to respond to the incoming central office line temporarily. This has the effect of preventing the delay in responding to central office lines (p) and reducing the load on the central office line operator.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram of an automatic horizontal switchboard showing an embodiment of the central office line incoming call response system according to the d* invention. ('30...Central control unit 4 SPU...Monitoring unit )OTOT...
Incoming office line trunk OLT')...Office line display panel O-line...Outgoing register SW...Switch ATTO...Office line relay board control device ATT...Office line relay board EXT...Extension connection Person O'1 Plan 1''--L''

Claims (1)

[Claims] In the central office line incoming call answering method in an automatic private branch exchange that uses a distributed relay system for incoming calls, when the number of unanswered calls exceeds a certain number of all incoming calls, it is determined that the central office line is incoming call congestion. A monitoring circuit is provided, and the central control unit t, which controls the entire exchange, identifies whether or not there is an output from the monitoring circuit that indicates incoming call congestion on the central office line each time an incoming call is connected to the central office line. If there is a steep incoming call width, an incoming call indication is given to the central office line display panel from the central office line relay board and the monitoring circuit, and either by a response operation from the central office line relay board or by an off-hook operation of the handset by the extension subscriber. A central office line incoming call response system configured to enable response.