KR100239174B1 - A method for switching received call in provate exchange system having funcation of internal system access - Google Patents

Abstract

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

The present invention relates to an incoming call switching method in a private exchange.

I. The technical problem to be solved by the invention

If there is an extension call at the private exchange, if the receiver is absent or there is no answer, the call exchange method is provided so that the incoming call can be transferred to a predetermined external trunk telephone number registered through the extension system direct access function implemented at the exchange. Is in.

All. Summary of Solution of the Invention

After the incoming call is set through the extension system direct access function of the private exchange, the incoming call is transferred to the extension of the subscriber of the exchange, and the incoming call is transferred to a predetermined telephone number registered through the setting. .

la. Important uses of the invention

The present invention is used in a private exchange in which an extension direct access function is implemented.

Description

A method for switching incoming calls in a private exchange through the direct system connection function {A METHOD FOR SWITCHING RECEIVED CALL IN PROVATE EXCHANGE SYSTEM HAVING FUNCATION OF INTERNAL SYSTEM ACCESS}

The present invention relates to a call forwarding method in a private exchange, and more particularly, a call forwarding method for switching incoming calls to a predetermined external trunk line number set through an extension system direct access function implemented in a private exchange. It is about.

Nowadays, almost all companies and offices have private exchanges installed and operated. Typical examples of such private exchanges include 'PBX (Private Branch Exchanger)' and 'Keyphone System'. The private exchange serves to connect the trunk lines and the stations by means of telephone lines (commonly referred to as trunk lines) in the premises exchange facility and the belonging switching handling section. On the other hand, such a private exchange has an incoming call switching function, so that the subscriber of the exchange can receive a call coming to his own station from another station subscribed to the exchange instead of his own station, or he is confident when he goes out. If the telephone number of the place is set in the call forwarding function, the incoming call can be received.

However, in the conventional private exchange, when the subscriber subscribed to the exchange leaves the office and the telephone number set through the call forwarding function is changed, that is, from the place corresponding to the set telephone number to another place. If the phone number to be transferred to the incoming call is changed, he could not answer the incoming call. However, if you move to a place, call a co-worker in the office to get a call from you, or you can change the call forwarding to the phone number where you moved. I had no choice but to receive it. However, this method also has a problem that if there is no person in the office or needs to receive an important call on the same day, it is necessary to enter the office without a method and answer the call or set up a call forwarding to where it is.

.

Accordingly, an object of the present invention is to set up an incoming call switching method of a private exchange, by making a call through a CO line from an outside, and setting a call to be transferred to his / her own station to the incoming call. Provided is an incoming call transfer method for performing call transfer.

In order to achieve this object, the present invention sets up a call forwarding through a predetermined extension system direct access function implemented in a private exchange, so that when a call is made to the extension of the subscriber of the exchange, a predetermined registration is made through the setting. We propose a method of diverting an incoming call to a telephone number.

1 is a block diagram of a conventional private exchange system.

2 is a flowchart illustrating a method of setting up call forwarding through an extension system direct access function according to the present invention;

3 is a flowchart illustrating a process of performing call forwarding according to the present invention;

Prior to the description of the present invention, a private exchange for implementing the present invention will be described.

The private exchange in which the present invention is implemented has a function of connecting to the exchange via an external trunk line to perform a role of an extension of the exchange through the external trunk line. This feature is commonly referred to as Direct Inward System Access (DISA). To illustrate the DISA function as an example, a predetermined registered ID and password which proves that the subscriber subscribed to the exchange is a subscriber of the exchange by calling the exchange via an external trunk line while traveling or going out for any reason. When inputted, the subscriber can implement the function of the extension of the exchange even through an external trunk line. Hereinafter, the present invention is to solve the above-described problem of the conventional private exchange by implementing a method for setting the incoming call switching in the private exchange implemented by the extension direct access function.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a block diagram of a private exchange system to which the present invention is applied. Referring to FIG. 1, the CPU 100 controls a call switch by processing a program that implements the DISA function and a predetermined program. Control services and operations in accordance with 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 stores control programs and initial service data for performing calls and various functions, and programs related to the DISA function. 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 trunk line circuit 180 is connected to an external trunk line to implement a call between the external trunk line and the exchange. The ring generator 150 outputs a ring signal in the form of a square wave to the general subscriber circuit 140. Key phone subscriber circuit 160 performs the interface between a plurality of key phone telephones and the 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 serves as a timer for counting a predetermined time under the control of the CPU 100 or detects a current time.

2 is a flowchart illustrating a method of setting up call forwarding through the extension direct connection function according to the present invention.

FIG. 2 illustrates an incoming call switching at an external trunk line through the DISA function of the exchange when the exchange subscriber goes out or does not receive an extension call, that is, the subscriber can receive a call that is received at the extension in the absence. This is done by setting up a phone number where you will be.

Referring to Fig. 2, the following operation is started while the private exchange subscriber makes a call to the exchange at an external trunk line. The central processing unit 100 confirms the call for the DISA call from the CO line circuit 180 in step 201. In step 202, the subscriber requests the extension number from the subscriber. In step 203, the extension number is input. If the extension number is input, it is determined whether the extension number is normal. If it is determined in step 203 that the extension number is not input within a predetermined time, step 202 is repeated. If it is determined that a normal extension number is input in step 204, a password input corresponding to the extension number is input in step 205. Require. This extension number input request and password input request are for confirming the subscriber of the exchange. If it is determined in step 204 that it is not a normal extension number, a predetermined error tone is generated in step 214, and in step 215, whether to retry the extension number input process is performed according to a decision of a pre-registered program. . At this time, if the program is set to receive the extension number again, step 202 is repeated, and if the program is set to end the setting process, the setting process ends. The CPU 100 determines whether the password has been input in step 206, and repeats step 205 when it is determined that the password is not input within a predetermined time. If it is determined in step 206 that the password has been input, it is determined in step 207 whether the input password has been normally entered corresponding to the extension number. If it is determined that the password is not a normal password, step 214 is performed. If it is determined in step 207 that the password is normally input, the central processing unit 100 generates a dial tone indicating that a predetermined digit input is possible in step 208, and allows the digit input to be possible in step 209. In step 210, the CPU 100 checks whether the digit inputted by the subscriber connected to the DISA call through the CO line circuit 180 is an incoming call switching code for setting up the incoming call switching. If it is determined in step 210 that the digital incoming call switching code is not a digit input, the CPU 100 receives a code for a predetermined function and executes a corresponding service. If it is determined in step 210 that the call forwarding code is input, the CPU 100 receives a phone number to be forwarded to the call in step 211. When the digit corresponding to the call termination code is input in step 212, a predetermined confirmation sound stored in the RAM 110 is generated and ends in step 213. If it is determined in step 212 that the end code is not input, the CPU 100 repeats step 213. In the process in which the digit input is required in the above description, if the digit input does not exist within a predetermined time limit, the preset operation is set or the call is terminated. At this time, the time limit is calculated by the clock circuit 105.

FIG. 3 is a flowchart illustrating a process of performing an incoming call switching operation in a private exchange in which the incoming call switching by the DISA function shown in FIG. 2 is set according to the present invention.

Referring to FIG. 3, when the call processing is performed at the extension of the private exchange set by the process of FIG. 2 in step 301, the central processing apparatus 100 causes the ring to be generated in the telephone connected to the extension in step 302. In operation 303, the CPU 100 determines whether the incoming call switching is set, and if it is determined that the incoming call switching is set, the CPU 100 operates the timer through the clock circuit 105. In step 303, if it is determined that the incoming call switching is not set, the incoming call is terminated. If a predetermined time passes after the timer in step 304 operates, the timer is terminated in step 305. When the timer expires, the central processing unit 100 checks whether the incoming call transfer set phone number is an external trunk line number or an extension number in step 306. If the extension number is confirmed in step 306, the extension ring generated in step 302 is released in step 309 to generate a ring of the ringing extension corresponding to the extension number. If it is determined in step 306 that the incoming call is switched to the external trunk line number, the central processing unit 100 determines whether the calling party that has reached the extension is the external trunk line in step 307. If it is determined in step 307 that the external trunk line, the central processing unit 100 releases the ring generated in step 302 in step 308 and transfers the incoming call to the internal station to the external trunk line set to the incoming call. For reference, the reason for confirming whether the calling party is the trunk line in step 307 is that, in general, when a call is requested from an extension to an extension, the call does not need to be automatically switched.

That is, since the extension subscriber of the private exchange described in FIG. 2 can perform call forwarding setting at an external trunk line, even if the subscriber does not set up call forwarding only through the extension of the exchange, the same as FIG. Call forwarding operation can be implemented.

As described above, the present invention provides an incoming call switching method in which a subscriber of the exchange can set incoming call switching through an external trunk line.

Claims (12)

Having a plurality of extension subscribers, a predetermined operation corresponding to the extension of the subscriber is performed, A call switching method of a private exchange in which an extension system direct access function is implemented such that the subscriber accesses through an external trunk line to perform the extension operation. In order to enable the exchange to perform an incoming call switching operation when an incoming call is performed to the extension of the subscriber of the exchange, When the incoming call is confirmed by the subscriber through the extension system direct access function, the subscriber receives a predetermined extension number and a corresponding password to confirm whether the exchange is a subscriber and confirms that the incoming call is performed by the subscriber of the exchange. Process, Receiving a predetermined code for setting an incoming call switching function of the exchange when it is determined that the incoming call is received by a subscriber of the exchange; Receiving and storing an external trunk line telephone number to be forwarded when there is an incoming call by the trunk line to the subscriber; After the storing process, if it is determined that a predetermined end code for terminating the incoming call switching function setting is input, the incoming call switching process includes terminating the incoming call switching function setting by the extension system direct connection function. After setting Determining that the extension is set to incoming call switching when a predetermined incoming call is made to the extension of the exchange subscriber; If it is determined that the extension is set to call forwarding, determining whether the set up call forwarding is set to an external trunk line number or to an extension number; If it is determined that the set of incoming calls is set to an external trunk line number, determining whether the incoming call to the extension is performed through a trunk line from the outside; If it is determined that the incoming call is performed through the CO line from the outside, the incoming call transfer is performed to the external CO line number which is set and stored in the call forwarding setting process through the extension system direct access function. A method of switching an incoming call in a private exchange. The method of claim 1, And if it is determined that the extension is not set to incoming call switching, ending the incoming call switching. The method of claim 1, And when the incoming call switch is determined to be set to an extension number, the incoming call switch method of the private exchange in which the exchange is performed to the stored extension number through a predetermined setting process. The method of claim 1, And if it is determined that the incoming call to the extension is not performed through the trunk line from the outside, the incoming call switching is terminated. The method of claim 1, When it is confirmed that the call is not received by the subscriber of the exchange, a predetermined error tone is generated, and the call switching is performed in the private exchange comprising a process of determining whether to repeat the extension number and password input process. An incoming call switching method in a private exchange characterized by the setting method. The method of claim 5, If it is determined that the extension number and password input process is repeatedly performed, the call forwarding is switched in the private exchange, characterized in that the private exchange switch repeats the extension number and password input process. Way. The method of claim 5, And if it is determined that the extension number and password input process is not repeated, terminating the call forwarding function setting by the extension system direct access function is terminated. The method of claim 5, The process of determining whether to repeat the extension number and password input process, Call switching designation in the private exchange is implemented to perform the method selected by the subscriber among the call forwarding call designation method of claim 6 and the call forwarding call designation method of claim 7 through a predetermined setting process in the exchange system. Way. The method of claim 1, If it is determined that a code for setting an incoming call switching function of the exchange is not input, it is determined whether a code corresponding to another function preset in the exchange is input, and if a code corresponding to the other function is input, the other A call forwarding designation method in a private exchange comprising: performing a function. The method of claim 1, If it is determined that a predetermined end code for terminating the incoming call switching function setting is not input, the incoming call switching function setting by the extension system direct connection function does not end for a predetermined time until the end code is input. Call forwarding designation method in a private exchange. The method of claim 1, The process of inputting the extension number, the process of receiving the password, the process of receiving a code for setting the call forwarding function of the exchange, and the process of receiving the end code are performed for a predetermined time limit. And if it is determined that the call is not set, terminating the incoming call switching setting process. In the call switching method of the private exchange having a plurality of extension subscribers, the direct extension system is implemented so that the extension subscribers are connected through an external trunk line to perform the extension operation, If it is confirmed that the call is received by the extension subscriber in response to a predetermined predetermined input confirming that the call is received by the extension subscriber in the extension system incoming state, the call is switched when there is a call received from the outside of the extension of the subscriber. And receiving and storing an external trunk line telephone number, and when the incoming call is received to the extension of the subscriber of the exchange, an incoming call switching operation is performed to the external trunk line telephone number to be forwarded.

Images