KR19990056107A - How to check if call forwarding function is set in private exchange system - Google Patents

Abstract

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

Method of handling call in private exchange system.

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

When the call forwarding function is set in the private exchange system, it provides a way to confirm the fact to the user.

All. Summary of the Solution of the Invention

When the subscriber terminal of the private switching system is off-hook, it is checked whether the call forwarding function is set, and if it is determined that the call forwarding function is registered, the fact is outputted to the subscriber terminal by using a predetermined ring tone registered in advance. It is characterized by.

la. Important uses of the invention

It is possible to check whether the call forwarding function is set in the subscriber terminal having no display unit subscribed to the private exchange system.

Description

How to check if call forwarding function is set in private exchange system

The present invention relates to a call processing method of a private switching system, and more particularly, to a method of confirming a fact of a user through a dial tone when a call forwarding function is set in a private switching system.

In a private exchange system, a call forwarding function is a function that allows a subscriber to transfer a call to another phone number which is set in advance. This means that if the terminal user subscribed to the private exchange system sets the call forwarding function during the absence, the incoming call to the subscriber terminal is switched to a predetermined place where the user can answer the call in the absence state. This function allows the user to receive a call elsewhere.

On the other hand, in the case of a digital subscriber station equipped with a display device such as an LCD, if the call forwarding function is set as described above, the set fact is displayed on the LCD so that the user can know that the call forwarding function has been set. . However, the user of the subscriber station, which is not provided with the display device, that is, does not have the display device such as the LCD, cannot know whether or not the terminal has already set the call forwarding function. Therefore, because the user does not know whether or not the call forwarding function is set, the user often forgets this when the call forwarding function is set. At this time, since the incoming call to the user is switched to another predetermined phone number, the user does not know the reason why the call is not incoming to the user, and thus a problem arises that the user cannot answer the call. I do not. There was also a problem that damages the manufacturer.

Accordingly, an object of the present invention is to provide a method for delivering to a user through a dial tone generated whether or not to set up a call forwarding function in a private exchange system, that is, to determine whether to set up a call forwarding function.

In order to achieve this object, the present invention checks whether the call forwarding function is set when the subscriber terminal of the private switching system is off-hook, and if it is determined that the call forwarding function is registered, the fact is registered in advance. The present invention proposes a method of outputting to a subscriber station using a specific dial tone.

1 is a block diagram of a private exchange system in which the present invention is carried out.

2 is a flowchart illustrating a method of confirming whether a call forwarding function is registered according to an embodiment of the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

On the other hand, in the following description of the present invention, when it is determined that detailed descriptions of related well-known functions or constructions may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted, and generally customary in constructing the present invention. Components and functions used as such will be omitted. The terms to be described below are terms defined in consideration of functions in the present invention, and may be changed according to the intention or custom of the user or chip designer, and the definitions should be made based on the contents throughout the present specification.

1 is a block diagram of a private exchange system in which the present invention is performed.

Referring to FIG. 1, the central processing unit 100 processes a preset program to control a call switch and to control various services and operations according to the present invention. The RAM 110 includes a program and a volatile data processing area, and is composed of a plurality of various buffers and used as a working memory of the CPU 100. The ROM 120 includes a control program for performing call and call waiting functions. The switching circuit 130 switches various tone and voice data, connections between stations, and connections of trunk lines under the control of the CPU 100. The general subscriber circuit 140 performs interfacing between a general telephone and a device of a plurality of subscribers. The ring generator 150 outputs a ring signal in the form of a square wave to the general subscriber circuit 140. The key phone subscriber circuit 160 performs an interface between a plurality of key phone telephones and a device. At this time, the key phone includes a predetermined display unit so that the subscriber can know the overall operating state of the system and the input telephone number. The tone generator 170 is controlled by the central processing unit 100, and scissor the trunk line to form a trunk line loop. In addition, an incoming signal received through the trunk line is interfaced. The DTMF receiver 190 analyzes the DTMF signal generated from the subscriber of the general subscriber circuit 140. Meanwhile, the DTMF transmitter 200 outputs the DTMF signal to the switching circuit 130 under the control of the CPU 100. The clock circuit 105 provides a clock function to the CPU 100, and has a timer function for counting a predetermined time. The ROM 120 includes an area for storing various types of dial tones according to the function of the exchange, and also stores a dial tone for checking whether the call forwarding function is set according to the present invention.

2 is a flowchart illustrating a method of checking whether a call forwarding function is set according to an embodiment of the present invention.

Before describing FIG. 2, in order to implement the present invention, the private exchange system shown in FIG. 1 should be a private exchange system in which a call forwarding function is performed.

Next, the present invention will be described with reference to FIG. 2. The CPU 100 determines whether the subscriber station is off-hook in step 210. That is, it detects whether the user uses the subscriber station to make a call. If it is determined in step 210 that the subscriber station is off-hook, it is determined whether the call forwarding function described above in step 212 is set in the subscriber station. If it is determined in step 212 that the call forwarding function is set in the subscriber station, in step 214, a ring tone generated corresponding to the call forwarding function setting is selected. The selected dial tone is stored in a dial tone database DB implemented in the ROM 120, which is selected after being searched through a predetermined search process. In addition, the dial tone may be selected and stored by a manufacturer or a user of the private exchange system. The dial tone selected in step 214 is output to the subscriber station in step 216. That is, a specific dial tone is generated so that the user can know whether the incoming call function is set through the receiver of the terminal. When the speakerphone function is implemented in the terminal, it is generated through a speaker. At this time, the user can hear the generated dial tone and know whether the call forwarding function is set in his terminal. In step 216, the dial tone selected is transmitted. In step 218, it is determined whether there is a predetermined release input for canceling the call forwarding function. If there is an incoming call function release input in step 218, the incoming call function is released in step 220, and a general call processing operation is performed. On the other hand, if it is determined that the call forwarding function is not set in step 212, in step 215 it generates a ring tone set by default in the private exchange system. That is, the type of the dial tone transmitted to the user varies depending on whether the call forwarding function is set. Therefore, the user can know whether the call forwarding function is set even if the user hears the dial tone.

Meanwhile, the generated dial tone may be generated by being selected from various dial tones according to the function state of the private exchange system, and when the voice guidance message transfer function is performed, a function of generating a voice guidance message instead of the dial tone. It is also possible. For example, the message is 'Current call forwarding is currently set'.

The present invention as described above has the advantage that a user who uses a subscriber station without a display device in the private switching system can easily know whether the call forwarding function is set.

Therefore, do not know whether the call forwarding function is set, it is possible to prevent the incoming call to be forwarded to another phone, so that the user receives a more convenient private exchange system services.

Claims (3)

In the method of confirming whether the forwarding function is set in the private switching system, When the predetermined subscriber station subscribed to the private exchange system is off-hook, it is checked whether the call forwarding function is set, and when it is determined that the call forwarding function is registered, the subscriber terminal reads out a specific ring tone registered in advance. To check if the incoming call function is set on the private exchange. The method of claim 1, If it is determined that a call forwarding function is not registered, a method of confirming whether a call forwarding function is set in a private exchange that reads a dial tone basically designated in the private switching system and outputs it to the subscriber terminal. In the method for confirming whether or not the call forwarding function is set in the private switching system that the voice guidance message generation operation is performed, When a predetermined subscriber station subscribed to the private exchange system is off-hook, it is checked whether a voice announcement message generated through the subscriber station is registered in response to the call transfer function, and a call forwarding function is set in the subscriber station. And if it is determined that the registered voice announcement message is generated by the subscriber station, the method of confirming whether the call forwarding function is set in the private switching system.