KR19990020265A - How to switch between call extension and call forwarding in keyphone system - Google Patents

Abstract

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

The present invention relates to an extension call method and an incoming call switching method in a key phone system.

I. The technical problem to be solved by the invention

When there is an extension call in the key phone system, if the receiver is absent or there is no answer, the call is made by calling an external phone or pager to make an extension call, or by providing a call forwarding method that allows the caller to recognize and select whether the call is forwarded. have.

All. Summary of Solution of the Invention

In a key phone system, a method of switching an incoming call to a predetermined registered telephone number when an extension call is requested.

la. Important uses of the invention

The present invention is used in a key phone system.

Description

How to switch between call extension and call forwarding in keyphone system

The present invention relates to an extension call and a call forwarding method in a key phone system. In particular, when an extension call is missed or there is no answer, the call is automatically switched to an external telephone or pager, or a caller can select whether to transfer the call. It is to provide an extension call and incoming call switching method.

Nowadays, almost all companies and offices are equipped with a keyphone system. The keyphone system is also referred to as a private branch exchanger. The key phone system 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. In particular, in the system, the stations are connected to each other. The extension call function is one of the important functions for efficient business processing. In addition, such a keyphone system has an incoming call switching function, so that a user can receive an extension call signal at a specific point within the system set arbitrarily.

However, in the conventional key phone system, when the user leaves the office for a while or leaves the system, that is, when the terminal registered in the system cannot be used, there is a problem in that an extension call signal cannot be received. That is, the call forwarding function of the conventional system could be used only when the user is inside the system. For example, when a user receives an extension call from another extension subscriber for urgent use while going out, the user may not receive the extension call signal, and thus, the user may not be able to make an extension call, and often sees a failure. Generation.

On the other hand, the conventional call forwarding function of the system is set by the receiver, and the caller who calls the extension when the receiver is unresponsive has to use the set forwarding call without any choice. However, when there is no need to make an extension call with a missed recipient, or when the caller judges that the receiver is in a difficult situation to receive a call, for example, when the receiver is absent, the call is forwarded to receive a call. Even when the telephone number set in the function is the place where the caller should not talk or the receiver should not receive the caller's call, the conventional system unilaterally performed the call forwarding function. Therefore, the caller had no choice but to unilaterally perform a call that the callee does not have to call in the absence of the callee, and the caller cannot determine whether the caller should call the callee in the absence of the callee. there was.

Accordingly, an object of the present invention is to provide a method for automatically converting a call to an external telephone or a pager if the receiver does not answer an extension call in the extension call method of the key phone system.

Another object of the present invention is to provide a method in which a caller can recognize and select whether or not a call is diverted in a call forwarding method of a key phone system.

Accordingly, the present invention is to register a predetermined external telephone number, and when the extension call signal is received, dial the registered external telephone number to establish a call connection.

In addition, the present invention after the automatic call forwarding mode or the manual call forwarding mode is selected and set, and when there is an extension call of the caller, the caller can select and perform one of the call forwarding mode. Suggest.

1 is a block diagram of a conventional key phone system.

2 is a flowchart of setting an extension call and call forwarding method according to the present invention;

3 is a flowchart illustrating a process of performing an extension call and an incoming call transfer according to the present invention;

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

1 is a block diagram of a conventional key phone system.

Referring to FIG. 1, 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 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 control programs and initial service data for performing calls and various 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. 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.

2 is a flowchart illustrating a process set by a general subscriber to perform an extension call and a call forwarding function according to the present invention.

2 illustrates an external contact number such as a telephone number or pager number where an incoming call is diverted so that a subscriber of a key phone system may go out or receive an extension call, that is, a subscriber may receive an extension call in the absence of the extension. Registering with the system, and allowing the subscriber to set whether to automatically forward the extension call when there is an extension call or to perform the call transfer at the caller's discretion. .

Referring to FIG. 2, in operation 210, the CPU 100 checks whether there is an input of a programming key for entering the programming mode from the general subscriber circuit 140. In step 215, the programming mode is implemented, and the CPU 100 checks whether there is an input for setting the incoming call switching mode from the general subscriber circuit 140 in step 220. If it is determined in step 220 that there is an incoming call switching mode setting input, in step 225 the CPU 100 detects and displays a previously stored telephone number in a buffer for incoming call switching among a plurality of buffers configured in RAM 110. do. When receiving the new telephone number in step 230, the CPU 100 displays the telephone number on the display unit of the key-phone telephone in step 233 and stores the telephone number in the call transfer buffer. If it is determined in step 230 that a new phone number has not been entered, the previous phone number displayed in step 225 is stored. In step 235, the central processing unit 100 inputs whether the incoming call transfer function is automatically performed when the system performs the incoming call transfer function, or whether the incoming call transfer is performed manually by the caller. Judge. If it is determined in step 235 that the incoming call switching for the automatic or manual is set to the incoming call switching mode, the selected incoming call switching mode is set in step 240. If it is determined in step 235 that there is no selected input, the incoming call switching is set to a default mode that is arbitrarily set. In the description of the present invention, it is assumed that the basic mode is set to the automatic mode. If a predetermined key for exiting the programming mode is input in step 250, the programming mode ends in step 255. If it is determined in step 250 that the programming mode end key is not input, the process is repeated repeatedly. On the other hand, the registered telephone number can be input to more telephone numbers according to the capacity of the RAM 110 configured in the system or the type of buffer configured in the RAM 110.

3 is a flowchart illustrating a process of performing an extension call and a call forwarding function according to the present invention.

3 illustrates a process of performing an incoming call switching operation to an external telephone number set by the subscriber when the subscriber of the key phone system goes out or does not receive an extension call, that is, when the subscriber is absent. Indicates. In this case, as shown in FIG. 2, if the subscriber has set the call forwarding automatically, the incoming call is switched to the set phone number, and if the call forwarding is set to be performed manually, the caller is called. It consists of the process of selecting whether or not to perform an operation.

Referring to FIG. 3, the CPU 100 determines whether there is an extension call in step 310. If it is determined that there is an extension call, in step 320 it is checked whether the call forwarding mode is set. If it is determined that the incoming call switching mode is not set, the predetermined other set function is performed in step 321. On the other hand, when it is determined in step 320 that the incoming call switching mode is set, the CPU 100 waits the caller for a predetermined time. In this case, the CPU 100 determines whether the receiving terminal is hooked off in step 340, that is, whether the receiver tries to carry out a call by picking up the receiver. And perform general extension calls. However, if it is determined in step 340 that it is not hooked off, the CPU 100 determines whether the designated time of step 330 has passed in step 350. In this case, if it is determined in step 350 that the specified time has not passed, the CPU 100 determines whether the called telephone is hooked on in step 351. At this time, if it is determined that it is hooked on, the system is in an idle state. However, if it is determined that the called telephone is not hooked on, step 340 is repeated. If it is determined in step 350 that the specified time has passed, the CPU 100 determines whether the incoming call switching mode is set to the manual mode in step 360. The incoming call switching mode setting is referred to in the above-described setting process of FIG. 2. If it is determined in step 360 that the incoming call switching mode is not set to the manual mode, the central processing unit 100 enters into the idle state in step 361, and the phone number stored in the incoming call switching buffer of the RAM 110 is entered in step 362. Dial and display the telephone number on the display of the caller's telephone. In step 363, the extension call is sent to the call forwarded location. However, if it is determined in step 360 that the call forwarding mode is set to the manual mode, in step 370, the system is in a dormant state, and in step 380, a predetermined tone is generated that the call forwarding is performed and the caller's telephone The phone number stored in the incoming call switching buffer of the RAM 110 is displayed. In operation 390, the CPU 100 determines whether an incoming call switching key and a predetermined ID are input. The call forwarding key represents a predetermined promised command key for the system to perform the call forwarding operation, and the ID is an arbitrary flag corresponding to each buffer when there are a plurality of the call forwarding buffers. . For example, the first buffer may be configured to store an external telephone number, the second buffer may store a pager number, and the third buffer may store a mobile phone number, and each caller may have a corresponding ID. This allows your phone to select the appropriate call forwarding buffer. If it is determined in step 390 that the incoming call switching key is input and a predetermined ID is selected and entered, step 361 is performed. If it is determined in step 390 that the call forwarding key and ID are not input, it is determined whether the telephone called in step 391 is hooked on. At this time, if it is determined that the hook is on, the system terminates the process after the system enters the idle state in step 392. However, if it is determined in step 391 that it is not hooked on, step 390 is repeatedly performed.

As described above, the present invention provides an incoming call switching method that automatically switches a call to an external telephone or a pager when the receiver does not answer in performing the extension call method of the key phone system, and at the same time, the caller receives the call. Selecting call transfer provides the advantage of making an extension call.

Claims (6)

In the extension call method of a key phone system having a plurality of subscribers, When there is an extension call of one of the plurality of subscribers, if there is no response from the subscriber receiving the call, a predetermined registered telephone number is detected and the detected telephone number is displayed so that the calling subscriber can know. And the subscriber calling the extension can select whether or not to switch the extension call to the telephone number. Have multiple subscribers, Call forwarding is implemented, In the incoming call switching method of the key phone system is registered the phone number to be transferred, And when the call forwarding request is made to the registered phone number, allowing the subscriber to select whether to perform a call forwarding to the registered phone number. The method of claim 2, And a method for displaying the registered phone number so that the subscriber can know when the call forwarding request is made to the registered phone number. The method of claim 2, The method for setting the system to allow the subscriber to select whether to perform the call forwarding operation to the registered telephone number, Setting the automatic mode to automatically perform the incoming call switching operation; Or, the incoming call switching method comprising the step of setting in the manual mode so that the switching operation is made by the selection of the subscriber. The method of claim 2, Method for performing the caller to select whether or not to perform the call forwarding operation to the registered telephone number, Dialing the registered telephone number when the call forwarding mode is automatically set when the system performs the call forwarding operation; And when the call forwarding mode is set to manual, dialing the registered telephone number under a predetermined command input by the subscriber. The method of claim 5, And when the call forwarding mode is set to manual, adding a step of not performing a call forwarding under a predetermined command inputted by the subscriber.