KR19990056122A - Call forwarding method by recognizing caller's phone number in private switching system - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to a method of switching an incoming call by checking a calling party number in a private exchange system.

I. The technical problem to be solved by the invention

The present invention provides a method for switching an incoming call according to a setting state by checking a calling party number in a private switching system.

All. Summary of Solution of the Invention

After confirming the caller's telephone number when performing the call forwarding operation in the private switching system, the phone number is transmitted to the called party switched to the called party according to the call forwarding operation.

la. Important uses of the invention

In a private exchange system, there is an advantage in that it is possible to know the telephone number of the calling party in the absence.

Description

Call forwarding method by recognizing caller's phone number in private exchange system

The present invention relates to a method of switching an incoming call in a private switching system, and more particularly, to an incoming call switching method of checking a caller's telephone number and transmitting it to a place where the incoming call is switched when the incoming call switching operation is performed.

In general, in a private switching system, the call forwarding function refers to a function of forwarding all incoming calls to a predetermined external telephone subscriber or to a predetermined extension subscriber.

In the conventional private switching system, the method of call forwarding can only divert the incoming call to the inside or the outside, or can only check what message is received when leaving a message to call his phone from the outside. In addition, the prior art can inform the person carrying the pager only that a message is in the phone, or when the other party enters the phone number, the number is transmitted to the pager. Therefore, in the conventional private switching system, the call forwarding method is cumbersome in that the caller must input his / her telephone number if he wants to make a wireless call. On the other hand, in the conventional private switching system, the call forwarding method does not have a method of informing the called person of the called person if the caller does not input his / her telephone number.

Accordingly, an object of the present invention is to provide an incoming call switching method for recognizing a caller's telephone number and transmitting it to an incoming call when performing the incoming call switching operation in a private exchange system.

In order to achieve the above object, the present invention recognizes the calling party's telephone number when performing the incoming call switching operation in a private switching system having a function of recognizing the calling party's telephone number and converts the recognized telephone number into the incoming call switching operation. The telephone number is transmitted to the called party according to the incoming call.

In addition, the present invention is to store the recognized telephone number in the memory for a user without a wireless pager receiving the telephone number, so that if the user wants to talk after listening to the recorded message in the absence, the memory It is characterized in that it additionally provides a method for connecting the call with the calling party using the phone number stored in the.

1 is a block diagram of a private exchange system according to the present invention;

2 is a view showing a process in which the incoming call switching operation according to an embodiment of the present invention is performed.

Hereinafter, a detailed description according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the embodiments of the present invention described below, detailed descriptions thereof will be omitted when there are conventional known functions and methods in connection with the present invention. In addition, the terms described in the embodiments of the present invention described below may vary according to the situation or intention of the practitioner, and should be recognized based on the general contents of the present specification.

1 is a view showing a schematic configuration of a private switching system according to the present invention, the central processing unit 100, memory 110, switching circuit 120, trunk line circuit 130, subscriber circuit 140, ring generator 150, tone generator 160 and DTMF receiver 170 And DTMF generator 180, repeater 190, voice storage 191 and caller identification 200.

A schematic operation of the private exchange system according to the present invention will be described with reference to FIG. The central processing unit 100 processes a set program to control a call switch, and controls various services and operations according to the present invention. The memory 110 includes a control program and initial service data for performing calls and various functions. In addition, the memory 110 stores the telephone number of the calling party during the execution of the control program according to the present invention. The switching circuit 120 switches various tone and voice data, connections between stations, and connections of trunk lines under the control of the CPU 100. The trunk line circuit 130 is controlled by the central processing unit 100 and forms a trunk line loop by scouring the trunk line. The subscriber circuit 140 performs an interface between a plurality of subscriber telephones and the switching device under the control of the central processing unit 100. The ring generator 150 outputs a square wave shaped ring signal to the subscriber circuit 140. The tone generator 160 interfaces an incoming signal received through the trunk line. The DTMF receiver 170 detects and analyzes a single tone frequency signal such as a dual tone multi frequency (DTMF) signal input through the subscriber circuit 140 and the trunk line circuit, that is, a complex frequency and a busy tone. The DTMF generator 180 outputs a DTMF signal to the switching circuit 130 under the control of the CPU 10. The relay station 190 processes a voice message or a voice guide message input and output through the trunk line circuit 130 and the subscriber circuit 140, and stores the voice message and the voice guide message in the voice storage unit 191. In addition, in the relay station 190, the present invention is also implemented in that a device having a voice mailbox function is generally used in addition to the private exchange system. The calling party identification unit 200 according to the embodiment of the present invention recognizes the calling party's telephone number for the incoming call connected with the trunk line, and transmits the recognized calling party's telephone number to the central processing unit 100. Therefore, the CPU 100 stores the transmitted telephone number of the calling party in the memory 110.

2 is a flowchart illustrating a process of performing an incoming call switching operation according to an embodiment of the present invention.

1 and 2 will be described a method for switching the incoming call by recognizing the calling party number in the private switching system according to an embodiment of the present invention. In operation 201, the CPU 100 determines whether there is a trunk line that is coming through the trunk line circuit 130. If the incoming line is busy, in step 203, the central processing unit 100 recognizes the telephone number of the incoming calling party through the caller identification unit 200 and stores the telephone number in the memory 110. In step 205, the CPU 100 determines whether the incoming CO line is in an incoming external transfer mode. If the incoming CO line is not in the incoming external transfer mode, in step 207, the CPU 100 controls the relay station 190 to receive an incoming call and input a signal to a corresponding subscriber or to a designated subscriber. Enter it. In step 209, the CPU 100 determines whether the called extension subscriber is set to an incoming external switching mode through the subscriber circuit 140. If the called extension is set to the incoming external switching mode, in step 211, the CPU 100 determines whether the incoming external switching mode is a wireless call. In the case of the wireless call, in step 213, the CPU 100 controls the trunk line circuit 130 to disconnect the trunk line. In step 215, the central processing unit 100 queries the trunk line circuit 130 to determine whether there is an empty trunk line. If there is a blank line, in step 217, the CPU 100 controls the CO line circuit 130, catches the blank line, outputs an external call number stored in the memory 110, and transmits the phone number confirmed by the caller identification unit 200.

On the other hand, if the incoming external transfer mode is not a wireless call, in step 219, the CPU 100 determines whether the incoming external transfer mode is the external transfer mode. If the incoming external transfer mode is the external transfer mode, in step 221, the central processing unit 100 controls the relay station 190 to read the message to switch the phone from the voice storage unit 191, and transmits the message through the CO line 130. The tone is sent to the calling party subscriber. In step 223, the central processing unit 100 queries the trunk line circuit 130 to determine whether there is an empty trunk line. If there is a vacant trunk line, in step 225, the central processing unit 100 catches the vacant trunk line and sends an external switching telephone number stored in the memory 110 to connect the two trunk lines.

In contrast, when the called extension does not set up the incoming external switching mode, in step 227, the CPU 100 determines whether the incoming mode is the extension switching dod through the subscriber circuit 140. If the incoming mode is the extension mode, in step 229, the central processing unit 100 reads a message to switch the phone from the voice storage unit 220, transmits the message through the CO line 130, and sends a hold tone to the calling party subscriber. To the extension of the telephone number stored in memory 110.

On the other hand, when the incoming mode is not the extension mode, the central processing unit 100 transmits a message to switch to the voice mailbox through the relay station 210 in step 231, and switches to the voice mailbox function.

As described above, in the present invention, the external call designation can be made by a wireless call in a private exchange system, and at the same time, the caller's telephone number can be known, so in case of urgent contact, the caller can make a call with the calling party without having to make a call. There is an advantage to that. Therefore, the present invention can provide various call forwarding functions in a private switching system, and in particular, the external call designation can be made by a wireless call, and when a wireless call is designated, a caller can leave a contact to be contacted. Can be. In addition, the present invention allows a person who wants to make an urgent call to a subscriber who is absent in a private exchange system can make a call without having to call again. In addition, the present invention can prevent the case where an emergency contact cannot be made without knowing the absentee's call number in the private exchange system. In addition, the present invention is convenient for the user when performing the wireless call service during the call forwarding function, because when using the caller identification function in the private exchange system can check the calling party's phone number without receiving the caller's phone number separately .

Claims (4)

In a private switching system comprising a device for recognizing the calling party number, a relay station for storing an input voice message or a pre-stored voice announcement message, and a voice storage unit for storing the voice message and the voice guidance message. In the incoming call switching method, A first process of detecting whether the extension is set to an incoming call switching mode when there is a call that is received by a subscribed extension; A second step of determining whether the incoming call transfer mode is set to an external pager or an external trunk line switch or an extension switch; A third process of transmitting a voice guidance message of the voice storage unit stored in advance in correspondence with each switching state through the voice transmission and recording apparatus; A fourth process of recognizing the calling party's telephone number; And a fifth process of transmitting the recognized telephone number to an external wireless pager, switching a call to the external trunk line, or switching a call to the extension. The method of claim 1, And when the call is not transferred to the external trunk line or the extension, the voice message of the calling party is stored in the voice storage unit through the relay station. The method of claim 1, When the call forwarding mode is connected to a wireless pager, the method for transmitting a call, characterized in that for transmitting the recognized calling party number to the wireless pager. In a private call switching method in a private switching system having a function of recognizing a calling party's telephone number, when the incoming call switching operation is set to an external wireless pager, Recognizing and storing the telephone number of the CO line when the incoming line is incoming, and transmitting the stored telephone number to the external pager during the incoming call switching operation.