JPS6361542A - Control system for forcibly disconnecting trunk line - Google Patents

Abstract

PURPOSE:To transmit a call to a trunk line at the time of emergency by operating a special number or a button to forcibly disconnect one of trunk lines by an exchange if lines to trunk lines are all busy. CONSTITUTION:If forcible disconnection requesting information Y is transmitted from a terminal X by the operation of a specific number or a button when lines to trunk lines are all busy in a private branch exchange, a central controller of the exchange selects, for example, a terminal A originating a call to a trunk line out of all busy trunk lines and performs the processing of the disconnecting request from the terminal X. This disconnection processing is performed based on the information Y by an event control program P1, a call processing monitor program P2, and a task execution control program P3 as if the disconnecting operation were performed by on-hook in the terminal A.

Description

[Detailed Description of the Invention] [Summary] When making a call on the middle line, if you encounter that the trunk line is busy, by operating the special number or button, the switchboard will call the trunk line that is busy. This method forcibly disconnects one of the trunk lines of the road, thereby making it possible to make an important or emergency transmission to the trunk line.

[Industrial application field]

The present invention is capable of forcibly disconnecting one of the trunk lines in response to a request from an important terminal or an urgent terminal when all trunk lines are busy, and the important or urgent relay line is disconnected. This invention relates to a forced disconnection control system for the middle line to enable line transmission.

Since the number of trunk lines is limited and is used as a shared resource, the trunk lines of a given route may be used intensively, and that route may be all busy. At that moment,
Even if an emergency call is made to the central line, the exchange will treat the call as busy, making it impossible to make a call to the trunk line.

Therefore, in such an emergency situation, m'! It is desired to make it possible to make a transmission.

[Conventional technology]

When all trunk lines are busy, a terminal that makes a new trunk line call to that route generally listens to the busy tone. In this case, if a detour route exists, a search is performed for vacant relay lines on the detour route, and if the detour route is also busy, a busy tone is sent from the exchange to the calling terminal. .

When all trunk lines are busy as described above, conventionally known methods include visually displaying the conversation, and requesting disconnection using an interrupt call. For example, FIG. 4 is an explanatory diagram when displaying that all lines are busy in the middle tOW direction, and terminals A, B,
...N is accommodated in the network (NW) 15 via the subscriber circuit (LC) 16, and connected to the trunk line 13.
are each accommodated in the network 15 via a trunk (POG) 17. This network 15 is controlled by a central control unit ('CC) 14, and forms, for example, a communication path between a trunk line originating terminal and the trunk line 13.

Furthermore, display operations are performed in accordance with display information applied from the central control unit 14 via a device D) 12 consisting of display lamps and the like corresponding to routes a, b, . . . n.

For example, if all trunk lines for route a are busy, display device 1
The indicator lamp corresponding to route a of 1 lights up.

FIG. 5 is an explanatory diagram of a trunk line interrupt call, in which the same reference numerals as in FIG. 4 indicate the same parts, and 18 is a mixer trunk (MX
T). When the trunk line 13 of route a is all busy, when the terminal X makes a trunk call and hears the busy tone, and performs a special number operation, the central controller 14 analyzes the special number and , select one line among all the relay lines 13 that are in use on route a, and connect the terminals that are talking using the selected line, for example, A and the calling terminal Control the connection as shown in . Then, when the originating terminal X requests terminal A to disconnect, and terminal A disconnects in response to the request, one of the trunk lines 13 becomes vacant.
Terminal X becomes capable of transmitting the medium fa line.

[Problem that the invention seeks to solve]

Conventional services in the case where the trunk line is all busy, as shown in FIG. 4, simply visually display whether all routes are busy or not, as shown in FIG. In the former method, a disconnection request is made by interrupting a call, and even if there is a request to make a trunk line call with a high degree of urgency, the former method requires waiting until the conversation is canceled. Also, in the latter method,
When the terminal that receives the disconnection request performs the disconnection operation, it becomes possible to make a new trunk line call, but the disadvantage is that it takes a long time to reach that point, making it useless in an emergency.

SUMMARY OF THE INVENTION An object of the present invention is to enable important or emergency transmissions to be made in a short time even when all trunk lines are busy.

[Means for solving problems]

The trunk line route forced disconnection control system of the present invention will be explained with reference to FIG. 1.

...X) 2 is accommodated in the network (NW) 5 via the subscriber circuit (LC) 6, and the trunk line 3 is
G) When a trunk line call is made from the terminal 2 in the private branch exchange 1 which is accommodated in the network 5 via the terminal 7 and the network 5 is controlled by the central controller (CC) 4,
When a relay line is encountered during all calls, by operating a special number or button from the terminal 2, the central control unit 4 selects one of the trunk lines 3 of the route where all calls are in progress, and transmits the call to the calling terminal. This will forcefully perform the disconnection process.

[Effect]

If a forced disconnection request is made by operating a special number or button from the terminal 2 while all trunk lines are busy, the central control device 4 of the private branch exchange 1 will recognize this and Select one line and perform disconnection processing from the calling terminal side. As a result, the busy status for all trunk lines is released,
It becomes possible to quickly make a trunk line call with a high degree of urgency.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a process explanatory diagram of an embodiment of the present invention, which will be explained with reference to the configuration shown in FIG. 1. For example, when a highly important terminal X accommodated in the private branch exchange 1 issues a trunk line transmission {i, other terminals A, B, etc., or trunk line 1 rank of the incoming connection and trunk line 1 rank of the outgoing connection When a trunk line trunk 7 is connected and all trunks 3 in that route are in use, a busy tone is sent to the originating terminal X indicating that all trunk lines are busy.

When the originating terminal X encounters such a trunk line being busy, the originating terminal X performs a special number operation to request forcible disconnection. In addition, in a terminal equipped with a specific function button or a button dedicated to a forced disconnection request, the forced disconnection request is made by operating the button.

The central control device 4 of the private branch exchange 1 selects and forcibly disconnects one line among all the trunk lines that are busy based on the special number information Y from the calling terminal X.
As shown in the figure, the event control program P1 connects the special number information Y to the queue Q2 of the call processing monitor program P2.

The call processing monitor program P2 converts this special number information Y into forced disconnection event information Y'' and connects it to the queue Q3 of the task execution control program P3.

The task execution control program P3 stores this forced disconnection event information Y" in the queue Q of the event control program P1.
Connect to 4.

The event control program P1 converts this forced disconnection event information Y" into disconnection event information Z. In this case, select from among the call information that is being transmitted on the trunk line in the route where all trunk line routes are busy. For example, it is converted into disconnection event information Z regarding the trunk line originating terminal A, and connected to the queue Q5 of the call processing monitor program P2.

The call processing monitor program P2 connects the disconnection event information Z to the queue Q3 of the task execution control program P3, and the task execution control program P3 sends a recovery/release order to the trunk line originating terminal A based on the disconnection event information Z. do. By executing this order, the path of the network 5 between the trunk line originating terminal A and the trunk 7 is opened, and the disconnection process of the private branch exchange 1 is performed in the same way as if the disconnection operation was performed from the trunk line originating terminal A by ending the call. will be held.

Therefore, if the selected trunk line originating terminal A, the private branch exchange L
The connection will be forcibly disconnected under the control of the central control device 4 of the terminal
can make trunk line calls.

FIG. 3 is an explanatory diagram of the operation of the embodiment of the present invention, in which terminal A is connected to the trunk trunk POG through trunk line transmission and is in the middle of a call, and terminal X performs trunk transmission operation. If this occurs during a trunk line conversation, the call processing state transitions as shown, and the terminal X is connected to the busy tone trunk BT and listens to the busy tone. When this terminal X goes on-hook due to listening to busy tone, it becomes empty.

In addition, when terminal X makes a forced disconnection request by operating a special number or button, the special number information Y
is converted into forced disconnection event information Y°, and calls in a stable state, that is, calls in a busy state, are extracted from the call information for calls originating from line 8a on routes where all trunk line routes are busy, and the calls in the call state are Identify the terminal type from the module number, such as whether the trunk line source is an extension terminal or a large-connection trunk line, and add information about the selected trunk line originating terminal A and its disconnection event to the event that triggers the disconnection. The event control program is then asked to re-analyze it. This is an imaginary situation in which forced disconnection event information Y'' from the task execution control program P3 is connected to the queue Q4 of the event control program P1 in FIG.

By reanalysis in the event control program P1, for example, a disconnection event for terminal A is normally generated. Is this the event system in Figure 2? :[lI program P1
This shows a state in which forced disconnection event information Y' is converted into disconnection event information Z for terminal A.

Based on this disconnection event information Z of terminal A, the task is executed as if terminal A had disconnected. Thereby, terminal A and trunk trunk P.

The connection with G is opened, and terminal A and trunk trunk PO
G becomes empty. Accordingly, the busy state of the middle 'm line is canceled, and terminal X is enabled to make a call on the trunk line.

It should be noted that selection of the trunk line originator for performing the disconnection process when the relay η route is all busy can be performed using various conditions such as call time and class identification.

〔Effect of the invention〕

As explained above, in the present invention, when a trunk line route is full-busy and a forced disconnection request is made by operating a special number or button, the central control device 4 of the private branch exchange This function selects one of the three lines and forcibly disconnects it from the calling terminal.This allows for highly urgent relay calls, and also prevents calls such as interruption calls. Since no time is required, there is an advantage that a trunk line transmission with high importance or urgency can be made quickly even when all trunk lines are busy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is an explanatory diagram of the present invention, and FIG. 5 is an explanatory diagram of a trunk line interrupt call. 1 is a private branch exchange, 2 is a terminal, 3 is a central line, 4 is a central control unit (CC), 5 is a network (NW), 6 is a subscriber circuit (LC), and 7 is a trunk (POG). Fig. 2 is a processing explanatory diagram of three actual examples of the present invention.

Claims (1)

[Scope of Claims] In a private branch exchange (1) accommodating a plurality of terminals (2) and a plurality of trunk lines (3), the terminal (2) transmits a trunk line transmission to transmit all trunk line routes. When a call occurs, the central control unit (4) of the private branch exchange (1) is activated by operating a special number or button on the terminal (2).
A trunk line forced disconnection control system characterized in that one line out of all busy trunk lines (3) is selected under the control of , and a disconnection process is forcibly performed from the calling terminal side.