JPS6077566A - Automatic callback system by additional dial - Google Patents

Abstract

PURPOSE:To attain talking with an automatic callback system with additional dial by calling a called extension at each prescribed time with the dialing of a caller when a called extension does not responds for a prescribed time and calling back the caller automatically when said extension responds. CONSTITUTION:When a caller desiring the automatic callback dials the station subscriber number of the caller itself and a specific number for automatic callback and hooks on, a CPU7 allows an automatic callback storage device to store the extension number of an extension telephone set 2 being the called extension and a station subscriber number of the caller. Then the CPU7 calls back the called extension from the device 9 at each prescribed time. If the called party does not respond for a prescribed time, the called party is called back again after a prescribed time. When the called party responds within the prescribed time, a trunk line trunk 4 and a sender 6 are acquired and the station subscriber number of the caller is read from the device 9 and it is transmitted to the trunk line 5 via the sender 6. When the transmission is finished, the extension telephone set 2 and the trunk 4 are connected by the switch 1 and the caller is called back automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic call-back system for a central office subscriber in a private branch exchange capable of receiving additional dials.

The additional dialing system in the private branch exchange is configured so that the calling party can make additional dials after a call is received on the central office trunk.

The purpose of the present invention is to use this additional dialing system, in which when the called extension is not answered by the caller's dialing for a certain period of time, the called extension is called and answered at fixed intervals by the calling party's dial operation. The purpose of the present invention is to provide a method that can sometimes automatically call back a caller.

In order to achieve the above object, the automatic call back system according to the present invention is an additional dialing system in a private branch exchange having a central office line trunk, which includes a receiving register, a sender, a called extension number, and a calling party's local subscriber number. It is equipped with an automatic call-back storage device for storing calls, a switch for forming communication paths, etc., and a central control device for controlling the exchange equipment, and the called extension can be called at a constant rate by dialing from the caller on the central office side. If there is no time response, stop ringing the called extension, connect the register to the central office trunk, and when the calling party dials the automatic calling special number and the calling party's central office subscriber number.

The special number and the caller's subscriber number are received in the register, the called extension number and the caller's subscriber number are stored in the automatic call-back storage device, and the automatic call-back is performed every predetermined period of time. The storage device goes up to call the called extension, and when the called extension answers, it captures the central office line and the sender, reads the caller's local subscriber number from the automatic callback storage device to the sender, and makes the call. The system is configured to make a call to a person.

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

FIG. 1 is an embodiment of the automatic callback system according to the present invention, and is a diagram of a relay system of a private branch exchange device that allows additional dialing.

In the figure, 1 is a switch, 2 is an extension telephone, 3 is a ringing sending circuit, 4 is a central office line trunk, 5 is a central office line, 6 is a sender, 7 is a central control unit, 8 is a register, and 9 is an automatic callback storage unit. are shown respectively.

When a call arrives from the office line 5 to the office line trunk 4, the central controller 7 transfers the office line trunk to the register 8 through the switch 1.
Connect to the line side. When the caller dials the extension number of the extension telephone 2, a ringing signal is sent from the ringing sending circuit 3 to the extension telephone 2.

Therefore, if the extension telephone 2 does not respond for a certain period of time, for example, 15 seconds, the central control unit 7 will issue an internal fJ! Stop the ringing to the telephone 2 and connect the register 8 again.

When the caller requests automatic callback, dials the special number for automatic callback and the caller's own subscriber number (11), and goes on-hook, the called party is stored in the central controller's 7-digit automatic callback storage device 9. The extension number of the extension telephone 2, which is an extension, and the calling party's subscriber number are stored.

As a result, the central control unit 7 calls the called extension from the automatic callback storage device 9 at regular intervals.If the extension does not respond for a certain period of time, it calls again after a certain period of time. If the caller responds within a certain period of time, the central office line trunk 4 and sender 6 are captured, the calling party's subscriber number is read from the automatic callback storage device 9, and sent from the sender 6 to the central office line 5.

When the call is complete, the extension telephone 2 and the central office trunk 4 are connected by the switch 1, and the caller is automatically called back.

In the practical example above, it is assumed that when extension telephone 2 is called and answered, it is known that an automatic callback will be performed, but in order to avoid misunderstandings, an announcement to that effect may be made to the extension telephone, etc. It is also possible to control the sending of a tone indicating that an automatic callback is in progress.

As described above in detail, according to the present invention, the caller is automatically called back to the extension of the private branch exchange device with which he or she wishes to make a call, and is then able to make a call.

[Brief explanation of the drawing]

FIG. 1 is a relay system diagram of a private branch exchange device showing a practical example of an automatic call-back system using additional dialing according to the present invention. l... Switch 2... Extension telephone 3... Ringing sending circuit 4... Office line trunk 5... Office line 6... Sender 7... Central control unit 8... Register 9. ...Automatic recall storage device patent applicant NEC Co., Ltd. agent Patent attorney Hisashi I) Ro

Claims (1)

[Claims] In an additional dialing system in a private branch exchange system having a central office trunk, a receiving register, a sender, an automatic call-back storage device for storing the called extension number and the calling party's central office subscriber number, and a communication path are formed. The switch is equipped with a switch that controls the switching equipment, and a central control unit that controls the switching equipment.If the called extension is called by dialing from the caller on the station side and there is no response for a certain period of time, the called extension is stopped from ringing and the above-mentioned when the register is connected to a central office trunk and the calling party dials an automatic calling special number and the calling party's central office subscriber number;
The special number and the caller's subscriber number are received in the register, the called extension number and the caller's subscriber number are stored in the automatic call-back storage device, and the automatic call-back is executed every predetermined period of time. Calls the called extension from the storage device, captures the central office line and the sender when the called extension answers, reads the caller's local subscriber number from the automatic callback storage device to the sender, and makes the call. An automatic call-back method using additional dialing, which is characterized by calling the person.