KR19990026688A - Call tracking method in digital telephone connected to private exchange - Google Patents

Abstract

It is a technology that tracks outgoing calls by outputting the caller's telephone number using a one-touch key during a call from a digital telephone connected to a private exchange.

If there is ring incoming call, it detects whether the incoming line is incoming or the extension line and registers the calling party's telephone number on the ring signal when there is ring incoming from the CO line. If the incoming line is incoming, register the calling party's extension number. When the subscriber answers the call and presses the call tracking key, the registered caller number is displayed on the LCD of the called party's phone to track the caller's phone number.

Description

Call tracking method in digital telephone connected to private exchange

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call tracking method in a digital telephone connected to a private exchange, and more particularly, to a method for tracking an outgoing call by outputting a caller's telephone number using a one touch key during a call in a digital telephone.

Recently, as phone violence and mischievous phone calls have increased, subscribers are demanding services to verify the calling party's phone number. Therefore, techniques for verifying caller's telephone number using exchange system are being developed. Therefore, in the prior art, after applying for a phone number tracking service, which is a prank call to a telephone company, when a prank call is received from the outside, the user dials the hook switch on-hook-off-hook-on-hook-off-hook-155 during a direct call. An action was taken to track the caller's phone number.

In this way, in order to receive the caller's telephone number, the hook switch is operated so that the user can press a specific function code after hook-flash operation. The caller could not recognize the call and disconnected the call.

Accordingly, an object of the present invention is to provide a call tracking method for tracking a caller's telephone number without a hook flash using a one-touch key in a digital telephone.

The present invention for achieving the above object, when there is a ring incoming from the CO line, when the caller presses the call tracking key in the state that the incoming subscriber is making a call after registering the caller's telephone number carried on the ring signal; The registered calling party number is displayed on the LCD of the called party's telephone to track the calling party's telephone number.

In order to achieve the above object, the present invention, when there is a ring incoming from the extension line, after registering the outgoing extension number, the incoming subscriber responds by pressing the call tracking key in the state of making an extension call. A number is displayed on the LCD of the called party's telephone to track the calling party's telephone number.

1 is a block diagram of a private exchange in accordance with an embodiment of the present invention.

2 is a control flowchart for tracking a caller's number during a call according to an embodiment of the present invention.

1 is a block diagram of a private exchange in accordance with an embodiment of the present invention.

The controller 10 provides various services to the subscriber, and accesses a preset program to control call switching and to track various services and caller's telephone number. The memory unit 12 incorporates the program initial service data for performing calls and various functions, and temporarily stores data generated during program execution. The trunk line circuit 14 forms a trunk line loop by scissoring the trunk line in response to the control of the controller 10, and interfaces a signal coming from the trunk line. The subscriber subscriber circuit 16 supplies the voice current of the voice band to the subscriber's key phone and the general telephone, and performs interfacing between the extension telephone and the device. The switching circuit 18 switches various tones and voice data under the control of the controller 10. The tone generator 20 generates the various tone signals under the control of the controller 10 and provides them to the switching circuit 18. The DTMF generator 24 outputs a DTMF (Dual Tone Multi Frequency) signal under the control of the controller 10. The DTMF receiver 26 analyzes the DTMF (Dual Tone Multi Frequency) received from the subscriber of the subscriber station 16 and applies the corresponding digit data to the controller 10. The R2 signal processor 28 exchanges register signals between stations when a caller ID number is requested for an incoming call. The digital subscriber circuit 16 connects the station and trunk line selection to the digital subscriber, under the control of the controller 10, supplies power to the digital subscriber and interfaces the input / output data between the digital subscriber and the controller 10.

2 is a control flowchart for tracking a calling number during a call according to an embodiment of the present invention.

1 to 2, the operation of the preferred embodiment of the present invention will be described in detail.

In order to carry out the present invention, a private exchange must be connected to an exchange carrying a caller ID on a ring signal. In addition, a call tracking key should be provided at each subscriber telephone of the private exchange.

In step 101, the controller 10 checks whether there is a ring call through the trunk line circuit 14 or the internal subscriber circuit 16, and proceeds to step 102 when the ring signal is received. In step 102, the controller 10 checks whether the incoming call is received and proceeds to step 103 when the incoming call arrives. In step 103, the controller 10 receives the caller's telephone number carried in the ring signal. Then, in step 103, the calling party number is stored in the buffer. However, if the incoming call is not an incoming call in step 102, the call proceeds to step 104, and the controller 10 stores the extension caller ID in the buffer. Then, in step 105, the controller 10 allows a ring signal to be supplied to the received subscribers and proceeds to step 106. In step 106, the controller 10 controls the call subscriber to make a call by forming a call path when answering by picking up the handset. Then, during the call, if the called party needs to verify the calling party's telephone number, the call tracking key provided in the key matrix of the phone is pressed. In this case, when the call tracking key is pressed in step 107, the controller 10 proceeds to step 108, and if the call receiving subscriber is a call tracking subscriber, the controller 10 proceeds to step 109. In step 109, the controller 10 displays the MAL CALL and the calling party number on the LCD of the receiving subscriber subscriber telephone through the subscriber circuit 16.

As described above, the present invention has the advantage of tracking the calling party number so that the calling party does not know that the called party confirms the calling party number during the call.

Claims (3)

A method for tracking a busy caller number in a digital telephone connected to a private exchange, If there is a ringing call from the CO line, register the caller's phone number on the ring signal and press the call tracking key while the called party is answering the call. A call tracking method in a digital telephone connected to a private exchange, characterized by tracking the caller's telephone number by displaying it on the LCD. A method for tracking a busy caller number in a digital telephone connected to a private exchange, Detecting whether there is a ringing call or an incoming call by an internal call when a ringing call is received by the digital telephone connected to the private exchange; Storing the calling number in a buffer and supplying a ring to the called subscriber when the ring incoming call is received by an internal call; After the ring is supplied to the incoming station subscriber to answer the process of forming a call to enter the call state, and And displaying the stored calling number on the LCD of the called party's phone when the call tracking key is pressed from the called party's phone in the call state. The method of claim 2, And storing the calling number carried in the ring signal in a buffer when the ring incoming / outgoing call is received by the trunk line call.