KR100238524B1 - Method for converting incoming call in digital phone connected to private exchange system provided with calling part's telephone - Google Patents

Abstract

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

It is about a private exchange.

I. The technical problem that the invention is trying to solve

Provides a call forwarding method in a digital phone connected to a private exchange.

All. Summary of Solution of the Invention

When the call forwarding mode is set when there is a call from the outside is characterized in that the incoming call to the phone number input by the incoming subscriber.

la. Important uses of the invention

Used for call forwarding at a private exchange where a calling party number is provided.

Description

Call forwarding method from digital phone connected to private exchange that provides caller's phone number

The present invention relates to a private exchange, and more particularly, to a call forwarding method in a private exchange.

Typically, in a private exchange that provides the calling party's telephone number to the called party, when the called party tries to divert the incoming call to a third party, it must first "hook off" the handset to answer the incoming call and then rekey through the key operation. I had to give the incoming call to him.

However, the called party often encounters a situation where he or she cannot answer the incoming call for reasons such as a meeting. Therefore, in such a case, there has been a demand for a method in which the called party can switch the incoming call to a third party without responding to the incoming call.

As described above, when the incoming call is to be switched to the third party, the incoming subscriber must first respond to the incoming call and then hand over the incoming call to the third party through key operation. For this reason, there has been a need for a method in which a subscriber can transfer an incoming call to a third party without responding to the incoming call.

Accordingly, an object of the present invention is to provide a method in which a called party can switch an incoming call to a third party without responding to the incoming call.

1 is a block diagram of a conventional private exchange to which the present invention is applied;

2 is a process flow diagram in accordance with an embodiment of the present invention.

The present invention for achieving the above object is characterized in that the private exchange recognizes the telephone number input through the keypad of the digital phone by the incoming subscriber receiving the incoming call to switch the incoming call to the input telephone number.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Many specific details are set forth in the following description and in the accompanying drawings to provide a more general understanding of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

First, referring to FIG. 1 showing a block diagram of a conventional private exchange to which the present invention is applied, the controller 108 generally controls the operations of each part of the private exchange to provide various services to the subscriber. The ROM 110 includes a program and initial service data of the controller 108 for performing basic call and various functions. The RAM 112 temporarily stores the program and processing data of the controller 108. The switching circuit 100 switches various tones and voice data under the control of the controller 108. The digital subscriber circuit 116 selects and connects the extension and the trunk line to the digital subscribers 118 and 120 under the control of the control unit 108, supplies power to the digital subscribers 118 and 120, and the digital subscribers 118 and 120 and the control unit ( Input / output data between 108) is interfaced. The tone generator 102 generates various tones under the control of the controller 108 and outputs the tones to the switching circuit 100. The DTMF receiver 104 analyzes an MFC (Multi Frequency Code) generated from a general telephone (not shown) of an extension subscriber and applies the corresponding digit data to the controller 108. The DTMF transmitter 106 generates an MFC signal under the control of the controller 108 and outputs it to the switching circuit 100. The general subscriber circuit 122 supplies the talk current of the voice band to the general telephone of the station subscriber under the control of the controller 108 and interfaces a signal between the general telephone and the controller 108. The trunk line circuit 114 sises the public telephone network C.O under the control of the controller 108 to form a trunk line call loop, and interfaces signals between the public telephone network C.O and the controller 108.

2 shows a processing flow for switching an incoming call in a private exchange according to an embodiment of the present invention.

First, the control unit 108 of the private exchange exchanges a ring signal to the corresponding digital subscriber in step 200 according to a call from the outside. As a result, the ringer rings on the subscriber's digital phone, and the caller's telephone number provided from the private exchange is displayed on the LCD. At this time, the called party can check the displayed caller's phone number and if the call cannot be answered, the call forwarding key is input through the keypad of the digital phone to set the call forwarding mode. The call forwarding mode is a mode for transferring a call to a third party, and the call forwarding key refers to a key designated in advance for performing a function of causing the private exchange to be set in the call forwarding mode. The control unit 108 then displays a message requesting the user to input a telephone number to be transferred to the liquid crystal display unit of the called subscriber digital phone in step 202. Accordingly, the called party enters the telephone number to which the incoming call is diverted through the keypad of the digital phone. The control unit 108 proceeds to step 206 to check whether the phone number input in step 204 is a registered phone number. The registered telephone number means a telephone number registered in advance in a private exchange in which a call forwarding service is provided. At this time, if the telephone number input by the called party in step 204 is not a registered telephone number, the controller 108 proceeds to step 208 to display an error message on the LCD of the called party's digital phone. The error message may be, for example, a message such as "not a registered telephone number". Subsequently, the controller 108 proceeds to step 204 to perform steps 204 to 206 again. On the contrary, if the phone number input by the called party in step 204 is a registered phone number, the controller 108 proceeds to step 210 and checks whether the phone number to be forwarded is busy. At this time, if a call is in progress, the controller 108 proceeds to step 212 and displays an error message on the LCD of the called subscriber's digital phone. The error message may be, for example, a message such as "in a call." Subsequently, the control unit 108 proceeds to step 204 to perform steps 204 to 210 again. Otherwise, if not in a call, the controller 108 proceeds to step 214 and displays an error-free message on the LCD of the called subscriber's digital phone. The no error message may be, for example, a message "forwarded." The control unit 108 proceeds to step 216 to supply the ring signal to the incoming call number, and stops the ring signal supplied to the incoming subscriber in step 218.

Thus, the called party can divert the incoming call to the third party without responding to the incoming call.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. In particular, in the embodiment of the present invention, only a digital phone is exemplified, but it is also applicable to a key phone phone or an ISDN phone having a data communication channel in addition to the voice call channel. Therefore, the scope of the invention should not be defined by the described embodiments, but should be defined by the equivalents of the claims and the claims.

As described above, the present invention has an advantage of enabling convenience of the user by being able to switch the incoming call to a third party without having to answer each time there is an incoming call.

Claims (2)

Claims [1] A method for diverting an incoming call at a digital phone connected to a private exchange providing a calling party number, When the call forwarding mode is set by the called party when there is a call to the subscriber of the digital phone from the outside, the phone number input through the keypad of the called party's digital phone is recognized and a ring signal is transmitted to the entered phone number. A call forwarding method in a digital phone connected to a private exchange provided with a calling party telephone number. A method for diverting an incoming call at a digital phone connected to a private exchange provided with a calling party telephone number, Supplying a ring signal to a corresponding subscriber's digital phone according to an external call; In response to a ringing sound output from the incoming subscriber's digital phone, when the incoming subscriber recognizes the incoming call forwarding key input through the keypad of the digital phone, the call forwarding mode is set to a call forwarding mode; Displaying a message requesting to input a telephone number to be transferred to the liquid crystal display of the called subscriber's digital phone when the call forwarding mode is set; Checking whether the telephone number is a registered telephone number upon recognizing the telephone number input through the digital keypad by the called party in response to the request message; If the telephone number is not a registered telephone number, displaying an error message on the LCD of the called subscriber's digital phone; If the telephone number is a registered telephone number, checking whether the telephone number is busy; Displaying an error message on a liquid crystal display of the called subscriber's digital phone when the telephone number is busy; Displaying an error-free message on a liquid crystal display of the called party's digital phone when the telephone number is not in a call; Supplying a ring signal to the telephone number and stopping the ring signal supplied to the called party.

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