JPS62284596A - Calling-back system - Google Patents

Abstract

PURPOSE:To call back a calling subscriber directly by storing the number of an extension subscriber or the number of the external calling subscriber corresponding to a trunk line trunk when the trunk line is engaged by a PBX- equipped extension or international origination or request origination of the external calling subscriber. CONSTITUTION:When a PBX 1 decides that an international call origination request is an international dialing call from its inter.national dialing access code, the extension number of an extension 7 is found from its equipment position and stored as a caller number in a caller number storage area in a storage device 9 corresponding to the trunk line trunk 5 at the time of the acquisition of the trunk line trunk 5. When the extension 7 is disconnected at the end of the call, the trunk line trunk 5 is not released, but made ready to receive a recalling signal (ring-down incoming) from the trunk line. When a recalling signal is received from the trunk line, the caller, i.e. extension 7 is called back based on the caller number stored in a pair with the trunk line trunk 5.

Description

Detailed Description of the Invention 30 Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a call-back method in an automatic private branch exchange, and in particular, the present invention relates to a call-back system in an automatic private branch exchange, and in particular, a system for automatically calling back extension subscribers who make international calls or requested calls from a central office line. This relates to a callback method that allows calls back automatically.

[Prior Art] For example, when an international call is made from an extension line accommodated by a private branch exchange (hereinafter referred to as PBX), the PBX is used to notify the fee.
X is later called back from the central office line, but since it is connected to the central office line using a ring-down signaling system, it is assumed that the charge notification is received by a call from the relay stand or from a designated extension via direct inline. It has become. In addition,
For general subscribers, for example, JP-A-59-74792
As shown in the publication, general subscribers can call back directly from the central office line.

[Problems to be solved by the invention] As can be seen from the above, general subscribers have been able to call back directly from the central office line, but it is generally not possible to call back directly to a PBX-accommodating extension line. It has become. As the number of international calls increases in the future, international calls from PBX accommodation extensions and
Although it is expected that international calls from outside callers via BX will increase, up until now it has been impossible to directly call back the PBX-accommodated extension lines or their outside callers directly from the central office line. It is.

The purpose of the present invention is to provide PBX accommodation extensions in general or PBX
To provide a call-back system that can directly call back the PBX-accommodating extension line or external caller directly from the central office line when an external caller makes an international call or a request call via a central office line.

[Means for solving the problem] The above purpose is to use the extension subscriber number or external caller number when the central office trunk is captured by the PBX-accommodating extension or by an international call or requested call by an external caller. This is achieved by storing the information corresponding to the central office line trunk.

[Operations] When a central office line call is made from a PBX-accommodating extension, the extension subscriber number is stored in correspondence with the captured central office trunk. In addition, when an external caller makes a central office line call via a PBX, the PBX identifies the external calling number from the external caller, and then connects the central office line to which the external calling number is captured. It is stored in correspondence. Therefore, when calling back from a central office line, the caller numbers stored in the central office line are called, making it possible to directly call back the caller from one central office line. be. In this case, if the central office line trunk is reserved in preparation for a callback from the central office line when the caller disconnects, the central office line trunk will not be captured for new central office line originating calls from the PBX. This ensures that the caller will be called back.

[Embodiment] The present invention will be described below with reference to FIGS. 1 and 2, taking an example of notifying international call charges.

First, the relay method in that case will be explained using Figure 2.
As shown in the figure, the PBXl according to the present invention, which accommodates an extension 7, is connected to a central office exchange 2 in the public network via a central office line trunk (ring-down signal format) 5, and the central office exchange 2 is connected to an international exchange 3 that also handles international calls. It has become so. On the other hand, P
A central office exchange 4 accommodating general subscribers 8 is connected to the BXI via central office line trunks (ring-down signal format) 6. When the central office exchange 4 is replaced with another PBX, the PBX 4 that accommodates the extension subscriber 8
and PBXI are connected via a dedicated line trunk 6. In the storage device 9 housed in the PBxl, the calling number associated with a central office line call is stored in correspondence with the captured central office line trunk.

FIG. 2 shows the flow of callback control according to the present invention. The purpose is extension 7 or PB.
X or subscriber 8 accommodated in central office exchange 4 makes an international call via PBXI and then makes an international call through central office exchange 2 and international exchange 3, but when extension 7 or subscriber 8 disconnects (
(At the end of the call) The international exchange 3 calls the caller's extension 7 or subscriber 8 to PB in order to notify them of the call charge.
There is a way to call back directly (without going through the relay stand in xl).

To explain the control in more detail, first, in response to an international call origination request, the central office line trunk 5 is seized in order to be connected to the international exchange 3. If the caller is extension 7, then (international access code) + (country code) + (domestic subscriber number (called party number)) is dialed from extension 7, but in PBXI When it is identified that the call is an international immediate call from the international immediate call access code, when the first office line trunk 5 is captured, the calling party number storage area corresponding to the office line trunk 5 in the storage device 9 is filled with extension 7. The extension number of the caller is determined from its storage location and stored as the calling party number. Now, when the extension line 7 is disconnected at the end of the call, the central office line trunk 5 is not released and is prepared for a repeat signal (ring-down call arrival) from the central office line. When a recall signal is received from the central office line, the calling party, that is, extension 7, is called back based on the calling party number stored in the central office line trunk 5. .

In addition, if the calling party is extension subscriber 8 accommodated in PBX 4, extension subscriber 8 will send (dedicated line access code) + (international immediate call access code) + (country code) +
(Domestic subscriber number (called party number)) is now dialed. As a result, the PBX4 removes the leased line access code from those dialed numbers, and instead adds the extension number of the extension subscriber 8 determined from the accommodating position of the extension subscriber 8 to the one equivalent to the PBX4 area code, and then makes the call. It is designed to be sent to the PBXI as the calling number. That is, (calling number) + (international immediate call access code) + (country code) + (domestic subscriber number) is the PBX
It is configured to send to I. In the PBXI, a calling party number from among these dialed numbers is stored in a calling party number storage area corresponding to the office line trunk 5 in the storage device @9 when the office line trunk 5 is acquired. When a call is returned from the central office line, the call is transferred to the extension subscriber 8 from the PBXI to the PBX 4 based on the stored calling party number.

In addition, if the calling party is a general subscriber 8, the general subscriber 8 will send the general subscriber 8 including the area code.
(P B X 1 main number) + (Calling party number) + (International access code) + (Country code) ))
is now dialed. In this case, since the central office line trunk 6 is in the ring-down signal format, the general subscriber 8 dials the PBXI representative number and then
After waiting for a second dial tone from the BXI to indicate the establishment of a communication path with the PBXI, the calling party number and subsequent numbers are dialed. The dialed digits from the general subscriber 8 are received end-to-end at the PBXI, but thereafter are processed in the same manner as in the case of a leased line.

In any case, when the caller to be called back answers the call back from the central office line, the calling party number stored in the central office trunk 5 correspondence is cleared, and subsequent disconnection of the caller is disabled. Accordingly, the central office line trunk 5 is released. In cases other than 1 international calls that do not require callback or requested calls, the calling party number corresponding to the central office trunk is not memorized, and the central office trunk is released by disconnecting the caller. .

Furthermore, if the extension subscriber 8 dials the number equivalent to the PBX 4 area number plus that extension number, it can be treated in the same way as the general subscriber 8 accommodated in the central office exchange 4. . Furthermore, although the above explanation is about international transmissions, the same applies to requested transmissions.

[Effects of the Invention] As explained above, in the case of the present invention, when an international call or a requested call is made by an external caller via a general PBX-accommodating extension or the PBX, This has the effect that the caller can be called back directly from the central office line.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a flow of callback control according to the present invention, and FIG. 2 is a diagram showing a relay system according to the present invention. 1...PBX (automatic private branch exchange), 2...Central exchange, 3...International exchange, 4...Central exchange (or PBX), 5...Central line trunk, 6... Office line trunk (or dedicated line trunk), 7...extension, 8
... General subscriber (or extension subscriber).

Claims (1)

[Claims] 1. A subscriber accommodated directly in an automatic private branch exchange, or via another automatic private branch exchange or central office exchange, receives a call via a central office trunk in the form of a ring-down signal. A caller return method after a call has been made with a person, where a central office trunk is captured by a central office dial from a subscriber for a service that requires caller recall. When a call is made from a central office line due to the termination of a call, the calling subscriber number is stored in the corresponding trunk, and the calling subscriber is directly called back based on the calling party number stored in the trunk corresponding to the above call. A call-back method characterized by: 2. When a central office line call is made by a subscriber accommodated in an automatic private branch exchange via another automatic private branch exchange or a central office exchange, the own telephone number dialed by the subscriber is stored as the calling party number. A call-back system according to claim 1. 3. The call-back system according to claim 1 or 2, in which, when the caller disconnects due to the end of the call, the captured central office line trunk is subsequently put in a reserved state in preparation for the arrival of a ring-down call.