JPS6041856A - Busy external line reconnecting system - Google Patents

Abstract

PURPOSE:To attain reconnection where a caller can call a called party later only with off-hook when the called party is busy by allowing a private branch of exchange to store the telephone number of the called party dialed by the caller. CONSTITUTION:When a telephone set A is hooked off, the set is connected to a PB register 3, then a tunk line outgoing dial and a trunk line subscriber number are received by the PB register 3, the dial information is stored in a dial number memory corresponding to the telephone set A in a main storage device 8. When the trunk line subscriber is busy, the caller hooks on after hooking operation. The exchange identifies a recalling request through the detection of the hooking and stores the request to a memory corresponding to the telephone set A. When the telephone set A is hooked off later, the stored telephone number is reconnected by allowing the exchange to reference the stored content of the main memory. When the connection is set, the content of the memory is erased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for reconnecting a busy outside line in an automatic private branch exchange.

If a subscriber encounters a call while the subscriber is talking, it will immediately try to connect again if the central office line/private line trunk is free. By the way, if a subscriber's call is not completed and the subscriber's call is subsequently encountered, the subscriber has to pick up the receiver and dial again.

There is a method that allows you to connect to a specific subscriber or central office line relay stand by simply picking up the handset, but the connection destination is limited to one location.

The object of the present invention has been proposed in view of the above-mentioned drawbacks. When an extension subscriber encounters a central office line or leased line subscriber busy, he/she can hang up the telephone after hanging up the telephone, and then pick up the telephone. It is an object of the present invention to provide a system for reconnecting an outside line during a call, which makes it possible to send a paging signal to a line or private line subscriber, and also makes it possible to pick up the receiver any number of times for paging.

The present invention provides an automatic private branch exchange system having a plurality of line circuits connected to an extension telephone, a switch circuit, a plurality of trunk circuits, a register circuit, a called party paging signal sender circuit, and a control circuit for controlling these circuits. , a storage circuit for storing the dialed number corresponding to the called party is provided which is connected to the control circuit, and when the extension subscriber encounters the called party who is talking, the control circuit stores the dialed number in the register circuit due to the hooking operation by the subscriber. The dial number corresponding to the caller is stored in the memory circuit,
When the handset is hung up and then picked up again, the control circuit controls the switch circuit according to the dial number corresponding to the called party in the memory circuit, selects the required trunk circuit tX, and connects the calling party and the called party. This is a busy outside line reconnection method that allows the line to be connected and a calling signal to be sent from the called party's calling signal sender circuit.

Next, the configuration of a busy outside line reconnection system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a relay system of an automatic private branch exchange system using a busy outside line reconnection system according to an embodiment of the present invention. A, B...
...X is an extension telephone, l is an extension subscriber circuit (LC), 2
is an automatic switching device (SW).

3 is a button register (PBII), 4 is a control device (CONT), 5 is a central processing unit (CPU), 6 is a central office line trunk (CBWT), and a 7-digit dedicated trunk (TL).
T), 8 is a main memory (MM), and 9 is a button sender (PB8D).

Next, the operation of the outside line reconnection system during a call according to an embodiment of the present invention will be described with reference to the drawings. First, when telephone A is picked up, it is connected to the pushbutton register 3, and the calling party hears the dial tone of the plano button register 3.

Next, when the central office number is dialed, the button register 3 counts the dial information and sends it to the central processing unit via the control unit. As a result, the central processing unit 5 connects the extension telephone A and the office line trunk 6, stores the office line calling number (route number) in the dial number memo 1 corresponding to the extension telephone A in the main memory 8, and The switch between A and the push-button register 3 is not restored, but the push-button register 3 is allowed to count the office line subscriber number to be dialed next. Next, dial the central office subscriber number and the button register 3 will appear.
Accordingly, the central office line subscriber number is stored in the dial number memory corresponding to extension telephone A in the main storage device 8. When the dialing is completed, the switch between the button register 3 and the extension telephone A and the button register 3 are restored.

When a subscriber on the central office line is encountered while the subscriber is busy, the calling party hangs up after hearing the busy tone from the central office line, confirms the special dial tone sent from the button register 3, and hangs up the telephone receiver. At this time, the central processing unit 5 detects the call and restoration of the extension telephone via the control unit 4, identifies the re-call request to the busy central office line subscriber, and
The request is stored in the re-call request memory corresponding to extension telephone A in the i3 storage v8, and the switch between the office line trunk 6 and the office line trunk and extension telephone A is restored.

When the calling party picks up the telephone receiver after an arbitrary period of time has elapsed, the central processing unit 5 detects this via the control circuit 4 and sends a re-call request memory and dial to the extension telephone in the main memory 8. Referring to the number memory 2, connect the office line trunk 6 and the button sender 9 according to the dial number,
A push button signal is sent from the push button sender 9 to the office line via the switch 29 and the office line trunk 6, and the extension telephone A and the office line trunk 6 are connected. If the central office line subscriber encounters the call again, extension telephone A simply hangs up the receiver and this function continues to be effective.

Further, when the central office line subscriber responds, a response signal is detected on the central office line trunk and sent to the central processing unit 5 via the control circuit 4.

As a result, the central processing unit 5 erases the dial number memory and the re-call 9 request memory corresponding to the extension telephone A connected to the central office line trunk 6. After the call with the central office line subscriber is finished, the next time the extension telephone A is picked up, normal outgoing calls can be made. In the description, a separate control circuit is provided in addition to the central processing unit as a control circuit, but it is also possible to integrate the control circuit.

Although the outside line reconnection system for central office line subscribers and the button signal system has been described above, it goes without saying that the system according to the present invention can also be applied to leased line subscribers or the dial pulse system.

As explained above, according to the present invention, when a subscriber encounters a call while the subscriber is talking, it is possible to call again by simply hanging up the handset after hanging up and gradually picking up the handset without dialing. It has the effect of becoming.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a relay system of an automatic private branch exchange device using a busy outside line Ff connection system according to an embodiment of the present invention. A, B, X... Extension telephone, 1... Extension subscriber circuit (LC), 2... Automatic switch R (
SW), 3...Button register (PI)
31L), 4...Control device (CONT),
... Central processing unit (CPU), 6 ... Central office line trunk (CBWT), 7 ... Dedicated line trunk ...
Plano Botansen>゛(pBSD). Agent Patent Attorney Susumu Uchihara

Claims (1)

[Scope of Claims] An automatic private branch exchange device having a plurality of line circuits connected to an extension telephone, a switch circuit, a plurality of trunk circuits, a register circuit, a called party paging signal sender circuit, and a control circuit for controlling these circuits. A memory circuit for storing a dial number corresponding to a called party is provided which is connected to the control circuit, and when an extension subscriber encounters a called party who is talking, the control circuit stores the dial number in the register by a picking operation by the subscriber. The dial number corresponding to the called party in the circuit is stored in the memory circuit, and when the receiver is hung up and then picked up again, the control circuit operates the switch circuit according to the dial number corresponding to the called party in the memory circuit. A busy outside line replay circuit that connects the line between the calling party and the called party by controlling the trunk circuit to select the desired trunk circuit, and allows the called party calling signal sender circuit to send out a calling signal. Connection method.