KR100904090B1 - Communication System for calling Many Members ? simultaneously talking over the Telephone with Them and Method thereof - Google Patents

Abstract

The present invention discloses a multi-party call & simultaneous call system and method thereof. Using a feeder call control unit with a main device and an auxiliary device, a multi-group call is carried out between a handling station on one end and a regional feeder on the other end, and the howling generated during multi-group calls on both ends is automatically extracted. Then, by implementing the multi-party call & simultaneous call system and method for smoothly communicating multi-group calls between both ends by filtering or compensating, multi-group calls or broadcasts through accommodating all feeder lines without disconnection of the entire communication network. Maximize the work processing environment and improve the speed and efficiency of work processing.

That is, the multi-party call & simultaneous call system according to an embodiment of the present invention includes a plurality of feeder telephone lines, record telephone numbers of both ends connected through the plurality of feeder telephone lines, and multi-group between the two ends. A feed telephone call controller for checking a call state in real time; An automatic line switching device for monitoring in real time whether there is a malfunction of the feeder call control unit or equipment failure state, and automatically switching a plurality of feeder phone lines connected to the feeder call control unit; A handle for transmitting one of the two ends of the group call request signal to the feeder call controller using a wired or wireless communication line connected to the feeder call controller; And the other one of the hem ends, and transmits a predetermined parasitic group call response signal in response to the group call request signal to the feeder call control unit so that the feeder call unit controls the multi-group call between the both ends. And a local power supply unit for performing a multi-group call with the handling station through a multi-group call line network connected to the plurality of feed phone lines by permitting.

Feeder call control unit, howling removal unit, multi-group call

Description

{Communication System for calling Many Members & simultaneously talking over the Telephone with Them and Method}

1 is a view schematically showing a general EMS feed telephone system.

2 is a view schematically showing a conventional circuit switching apparatus.

3 is a diagram illustrating a multi-member call & simultaneous call system according to an embodiment of the present invention.

4 is a flowchart illustrating a multi-member call & simultaneous call method according to an embodiment of the present invention.

5 is a diagram illustrating a main device / auxiliary device of a multi-party call & simultaneous call system according to an embodiment of the present invention.

The present invention relates to a multi-member call & simultaneous call system and a method thereof, and more particularly, a feeder telephone call control unit having a main device and an auxiliary device, and a local feeder that is one of both ends and the other of the other end. The present invention relates to a multi-call system and a method for smoothly communicating multi-group calls between both ends by performing a multi-group call between two parties, automatically extracting howlings generated during multi-group calls at both ends, and filtering or compensation processing.

In general, the feeder telephone system is a communication system that connects the regional command zones of power plants or substations of each region with the central command zones of feeder stations that control and manage the feeder stations of each region, and the feeder telephone system is illustrated in FIG. As described above, it includes a handling table 1, a main device 2, and a line switching device 3.

The handle 1 serves to randomly call or respond to the feeder depots C1 to CN of a plurality of regions, and the main device 2 is connected to the line switching device 3 to generate and transmit a call. The call is received and delivered to the handle 1.

The line switching device 3 determines whether there is a failure when transmitting or receiving, and automatically switches the line when a failure occurs, thereby preventing the communication from being cut off when a failure occurs.

The conventional circuit switching device 3 is composed of a circuit switching unit 31 and a manual circuit switching unit 32, as shown in Figure 2, when a system failure occurs by the operator after confirming the alarm sound or visual Manual transfer from the manual circuit transfer section 32 to the normal equipment.

In the conventional feeder telephone system as described above, the call sensitivity of the multi-group call between both ends is inferior due to the occurrence of a howling (a kind of noise) in the multi-group call between the handling unit 1 and the feeder station C1 to CN. As a result, a problem arises in that a normal multigroup call between both ends is impossible.

The present invention has been made in order to solve the problems of the prior art, the object of the present invention is to use a feeder call control unit having a main device and an auxiliary device, the handle is one of both ends and the other one of the other end By implementing a multi-party call & simultaneous call system and method for multi-group call between all, the dispatch order instruction or multi-party meeting for multi-group group call is maximized without interruption of the entire communication network, thereby maximizing work efficiency. This is to improve the speed and efficiency of work processing.

In addition, another object of the present invention is to implement a multi-party call & simultaneous call system and method for automatically extracting the howling generated during the multi-group call between the two ends, filtering or compensation processing, the multi-group call between the two ends It is designed to facilitate communication and provide an online communication environment with high call sensitivity during multi-party meetings.

The present invention for achieving the above object includes the following embodiments. That is, the multi-party call & simultaneous call system according to an embodiment of the present invention includes a plurality of feeder telephone lines, record telephone numbers of both ends connected through the plurality of feeder telephone lines, and multi-group between the both ends. A feed telephone call controller for checking a call state in real time; An automatic line switching device for monitoring in real time whether there is a malfunction of the feeder call control unit or equipment failure state, and automatically switching a plurality of feeder phone lines connected to the feeder call control unit; A handle for transmitting one of the two ends of the group call request signal to the feeder call controller using a wired or wireless communication line connected to the feeder call controller; And the dispatch telephone call controller permits the multi-group call between the both ends, as the other one of the hem ends, and transmits a predetermined parasitic group call response signal in response to the group call request signal to the feed telephone call controller. And a local power supply unit for performing a multi-group call with the handling station through a multi-group call line network connected to the plurality of feed phone lines.

In a multi-member call & simultaneous call method according to another embodiment of the present invention, a feeder telephone call control unit includes a plurality of feeder telephone lines, and records telephone numbers of both ends connected through the plurality of feeder telephone lines. Checking in real time the multi-group call state between both ends; Monitoring, by the automatic line switching device, whether a malfunction of the feeder call control unit or a malfunction of the equipment is performed in real time, and automatically switching a plurality of feeder phone lines connected to the feeder call control unit; A handling unit having one of the both ends transmits a predetermined parasitic group call request signal to the feeder telephone call controller using a wired or wireless communication line connected to the feeder telephone call controller; And a local feeding unit, which is the other one of the hem ends, to transmit the predetermined previously generated group call response signal to the feeding telephone call controller in response to the group call request signal. Permitting, by the feeder telephone call control unit, a multi-group call between the handling station and the local feeding unit in response to receiving the group call request signal of the handling station and the group call response signal of the local feeding unit; Allowing the feeder call control unit to permit the multigroup call so that the handle and the local feeder perform a multigroup call through a multigroup call line network connected to the plurality of feeder lines; And when the multi-group call transfer between the handle and the local feeder, the feeder call control unit extracts the already generated howling for a predetermined delay time, and then filtering or compensation processing.

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

3 is a diagram illustrating a multi-member call & simultaneous call system according to an embodiment of the present invention.

Referring to FIG. 3, the multi-party call & simultaneous call system 1000 includes a handling table 100, a local feeder 500, a feeder call control unit 200, an automatic line switching device 300, and a communication terminal 400. ).

That is, the multi-party call & simultaneous call system 1000 uses the feeder call control unit 200 including the main device 201 and the subsidiary device 202, one of the two ends of the handle 100 and the other of the two ends. It is a multi-currency system that makes multi-group calls between regional feeders 500, automatically extracts howlings generated during multi-group calls at both ends, and filters or compensates them to smoothly communicate multi-group calls between both ends. .

First, the feeder phone call control unit 200 has a main device 201 and an auxiliary device 202 therein, a plurality of feeder phone lines connected to the main device 201 and a plurality of feeder phone lines connected to the auxiliary device 202. It consists of. The feed telephone call control unit 200 records the telephone numbers of both ends connected to the multi-group call through a plurality of feed telephone lines, and checks the multi-group call state between the two ends in real time.

That is, the feeder call control unit 200 controls the multi-group call connection, the multi-group standby and the multi-group locked state in real time when the multi-group call between the two ends, the multi-group call line network used for the multi-group call between the two ends Monitor the condition continuously.

If the feeder call control unit 200 detects an abnormality of the multi-group call line network, it generates notification information indicating whether the multi-group call line network is abnormal and transmits it to either end.

Of course, the feeder call control unit 200 as a prerequisite that it can be delivered to any one of the both ends of the notification information indicating whether or not the abnormality of the multi-group call line network only on the premise that the phone number of both ends.

In more detail, the feeder call control unit 200 includes a main unit 201 and an auxiliary unit 202. The main apparatus 201 has a plurality of feeder telephone lines, and records the telephone numbers of the handles 100 and the telephone numbers of the plurality of local feeder units 500 connected through a multi-group calling line network designed from the plurality of feeder telephone lines. In addition, the multi-group call connection state between the handle 100 and the plurality of local power supply units 500 is checked in real time.

In addition, the main device 201 pre-stores the telephone numbers of the handle 100 and the plurality of local feeder 500, both ends of the group call request signal and the group call response signal that is essential for the multi-group call connection between both ends. Receive from.

In addition, the main device 201 checks whether there is an abnormality in the multi-group call line network used in the multi-group call connection, generates notification information indicating whether or not the predetermined multi-group call line network is abnormal, and then sends the notification information to both ends. Forward to any of the phone numbers.

Subsequently, the auxiliary device 202 of the feeder call control unit 200 is a device capable of performing all the control functions of the main device described above. When the main device 201 is malfunctioning or equipment failure, the main device 201 Instead, it acts as a preliminary control device for controlling multi-group call calls between both ends and recording phone numbers between both ends.

The auxiliary device 202, like the main device 201, is provided with a plurality of feeder telephone lines, and when a malfunction or equipment failure of the main device 201 occurs, the auxiliary device 202 is in the operation standby mode and is converted into the operation active mode. To substitute for all control functions of the main apparatus 201.

That is, the auxiliary device 202 is converted into a form of replacing the pre-formed multi-group call line network from a plurality of feeder telephone lines connected to the main device 201 through an automatic switching process. In other words, the auxiliary device 202 substitutes for the multi-group call call control and recording of the phone number of the main device 201 and inherits the multi-group call line network of the main device 201 as it is.

The handle 100 is one of both ends as mentioned above, which is requested for connecting a multi-group call with a plurality of local feeders 500 using a wired or wireless communication line connected to the feed telephone call controller 200. Generates a group call request signal.

Similarly, the regional feeder 500 is the other one of the ends as mentioned above, and transmits a pre-generated group call response signal to the feeder call control unit in response to the group call request signal. 200 allows multi-group calls between both ends to conduct multi-group calls with handle 100 through multi-group call lines network.

Hereinafter, the main device / auxiliary device 201/202 of the feeder telephone call control unit 200 according to the embodiment of the present invention has a common component of a local feeder card, a handling card, a howling remover, and a common controller. Include as.

The area feeder card stores the phone numbers of the plurality of area feeders 500 and the phone numbers of the handle 100, and through the first display device that is expensive when the multi-group call is connected to the handle 100. Multi-Group Call Displays the connected call status.

The handle card stores the phone number of the handle 100 and the phone numbers of the plurality of local feeders 500, and the handle 100 displays the phone numbers of the plurality of local feeders 500 for each short touch. The number is converted to a number, and each short touch number is touched on the screen to make a multigroup call with a plurality of local feeders.

In other words, the handle card displays the call state of the multi-group call connection through the second display device which is instrumented by the handle 100 making an emergency call with the plurality of local power supply units 500.

The howling removal unit is a device that compensates the howling formed automatically by the handling unit 100 by performing a multi-group call with the plurality of local feed units 500. The handling unit 100 and the plurality of local feed units 500 are provided. As a multi-group call is conducted between two channels, a howling, which is a noise signal generated during a predetermined delay time, is automatically extracted and filtered.

The common controller controls the signal processing and operation of the local feeder card, the handling card, and the howling controller, and checks the call status of the multi-group call in real time.

Subsequently, the automatic line switching device 300 monitors in real time whether the feeder phone call control unit 200 is malfunctioning or equipment failure state, and automatically switches a plurality of feeder phone lines connected to the feeder phone call control unit 200.

That is, the automatic line switching device 300 determines that the main device 201 of the feeder call control unit 200 is in a malfunction or equipment failure state, and thus, a multi-group call pre-formed from a plurality of feeder phone lines connected to the main device 201. After automatically switching the line network, the automatically switched multi-group call line network is inherited as it is to a plurality of feed line lines provided in the auxiliary device 202 of the feed line call control unit 200.

That is, the automatic line switching device 300 automatically switches over to the auxiliary device 202 even if all the control functions of the main device 201 and the feeder telephone line network formed from the power supply phone line are switched to the auxiliary device 202. Device.

In addition, the communication terminal 400 is connected to the automatic line switching device 300, when a malfunction or equipment failure of the feeder call control unit 200, the malfunction of the feeder call control unit 200 or equipment failure It generates and transmits an MMS / SMS message or an e-mail that notifies the implementation date of the automatic line transfer and the automatic line transfer execution time according to the failure history and the automatic transfer of a plurality of feeder telephone lines.

In addition, the multi-party call & simultaneous call system 1000 further includes a recording device 700, a video server 600, and an NMS simulator 800.

The recording apparatus 700 is connected to the feeder call control unit 200 and the handling unit 100 through an Ethernet network formed by a wired or wireless communication line, and multi-group calls between the handling unit 100 and the plurality of local feeding units 500. According to the implementation, the multi-voice call history, multi-voice call time, the phone number of the handling unit 100 and the phone number of the plurality of local feeder 500 are stored.

The image server 600 is connected to the feed telephone call control unit 200 and the handling unit 100 through an Ethernet network, and is provided for each of the first camera and the plurality of local feeding units 500 provided in the handling unit 100. Multiple video call details, multiple video call times, telephone numbers of the handle 100, and telephone numbers of a plurality of local feeders 500 are recorded and stored according to the multi-group call between the second cameras.

The NMS simulator 800 is connected to the feeder call control unit 200 and the handling unit 100 through an Ethernet network, and when the malfunction of the main unit 201 or the equipment failure occurs, the automatic line switching device 300 of the main unit 201 As a plurality of feeder telephone lines are automatically switched to the auxiliary device 202, the fault history, the line transfer implementation date, and the line transfer execution time transmitted from the automatic line transfer apparatus 300 are monitored.

4 is a flowchart illustrating a multi-member call & simultaneous call method according to an embodiment of the present invention.

Referring to FIG. 4, a multi-group call is carried out using a feeder call control unit having a main unit and an auxiliary unit, and a multi-group call between a handling station, which is one of both ends, and a regional feeder, which is the other of both ends. The present invention relates to a multi-member call & simultaneous call method that automatically extracts a generated howling and then filters or compensates to smoothly communicate a multi-group call between both ends.

First, the feeder telephone call control unit includes a plurality of feeder telephone lines, records telephone numbers of both ends connected through a plurality of feeder telephone lines, and checks the multi-group call state between both ends in real time (S1 and S2).

The automatic line switching device monitors in real time whether the feeder call control unit is malfunctioning or equipment failure, and automatically switches a plurality of feeder phone lines connected to the feeder call control unit (S3 and S4).

The handling unit transmits the pre-generated group call request signal to the feeder call control unit using a wired / wireless communication line connected to the feeder call control unit, and the local feeder transmits a predetermined parasitic group call response signal in response to the group call request signal. The feeder transfers to the call control unit (S5).

The feeder call control unit accepts the group call request signal from the handling station and the group call response signal from the local feeding unit, respectively, and permits multi-group calls between the handling station and the local feeding unit (S6).

As the feeder call control unit permits the multi-group call, the handle and the local feeder perform the multi-group call through the multi-group call line network connected to the plurality of feeder lines (S7).

As the handling station and the plurality of regional feeders make a multigroup call, the handling station makes a multigroup call to one or more selected regional feeders of the plurality of regional feeders. However, one or more local feeders that appear to be waiting for a call and cannot make a multi-group call with the handle form a delay time which is a predetermined call waiting time. This causes a howling belonging to the noise signal to occur during the delay formed between the handle and one or more selected local feeders that appear to be waiting for a call.

For this reason, the feeder call control unit automatically extracts a howling generated during a delay time formed between one or more local feeders that appear to be waiting for a call without performing a multi-group call, and then filters or compensates (S8).

Here, the filtering or compensation processing compares the multi-group call signal with the howling mixed with the original multi-group call signal, extracts and deletes the corresponding howling signal value, or reconstructs the signal value lost during the original multi-group call signal. It refers to the signal processing to restore.

As a further explanation of (S1, S2), the claim provided in the feeder call control unit has a plurality of feeder lines and handles multigroup call connection through a multigroup call line network designed from a plurality of feeder lines. Record the phone number and phone numbers of the many regional feeders.

The claim also checks in real time the multi-group call connection between the handle and the multiple regional feeders.

The auxiliary device provided in the feed telephone call controller includes a plurality of feed telephone lines, and when a malfunction of the main apparatus or an equipment failure occurs, the emergency telephone call control of the main apparatus is switched from the standby mode to the active mode. And acting as a record of the telephone number and inheriting the feeder telephone network of the main apparatus.

That is, the operation for (S1, S2) is performed in any one selected from the main device or the auxiliary device provided in the feeder telephone call control unit, so that the desired operation is performed as it is, regardless of whether performed in the main device or the auxiliary device.

Although not shown in FIG. 4, the operation description regarding the components (that is, the recording device, the video server, and the NMS simulator) additionally configured in the multi-party call & simultaneous call system will be described as follows.

That is, the recording device is connected to the feeder call control unit and the handling station through the Ethernet network formed by wired / wireless communication lines, and the multiple voice call history and the multiple voice call time according to the multi-group call between the handling station and the plurality of regional feeders. Record and store telephone numbers of telephones and telephone numbers of the plurality of regional feeders.

The video server is connected to the feeder call control unit and the handling station through the Ethernet network, and the multi-video call history of the multi-group call between the first camera provided in the handling station and the second camera provided in each of the plurality of regional feeding units is performed. Record and store multiple video call times, telephone numbers for handlebars, and telephone numbers for multiple regional feeders.

The NMS simulator is connected to the feeder call control unit and handling station through the Ethernet network, and when the main unit malfunctions or the equipment breaks down, the automatic line transfer device automatically transfers a number of feeder phone lines of the host unit to the auxiliary device. Monitor the fault history, line transfer implementation date, and line transfer implementation time delivered from the device.

5 is a diagram illustrating a main device / auxiliary device of a multi-party call & simultaneous call system according to an embodiment of the present invention.

Referring to FIG. 5, the main device / auxiliary device 201/202 of the multi-party call & simultaneous call system includes a local feeder 210, a handle card 211, a howling remover 212, and a common controller 213. It includes.

The area feeder card 210 stores the phone number of the area feeder and the phone number of the handle, and displays the state of the multigroup call connected call when the multigroup call is connected between the handle and the plurality of area feeders. Display through the device.

In addition, the area feeder card 210 receives the group call response signal sent from the area feeder, and permits the multi-group call to be carried out between the handling station and the plurality of area feeders.

The handling card 211 stores the telephone number of the handling desk and the telephone number of the regional feeding unit, and the handling unit converts the telephone numbers of the plurality of regional feeding units into respective shortcut touch numbers, and screens each of the shortcut touch numbers. As a multi-group call is made with a plurality of local power supply units by touching, the handle card 211 displays the call state connected to the multi-group call through the second display device.

In addition, the handle card 211 receives a group call request signal sent from the handle, and permits the multi-group call to be carried out between the handle and the plurality of local power supply units.

Here, it should be noted that a multi-group call is made only when both a group call request signal and a group call response signal according to an embodiment of the present invention are input to the master / auxiliary device 201/202.

The howling removal unit 212 automatically extracts a howling generated during a delay time automatically generated according to the multi-group call between the handling station and the plurality of local feeders, and then filters or compensates the processing.

The common controller 213 controls the signal processing of the local feeder card 210, the handling card card 211, and the howling remover 212, and checks the call state of the multi-group call in real time.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

According to the above-described configuration of the present invention, the present invention uses a feeder call control unit having a main device and an auxiliary device to make a multi-group call between a handling station, which is one of both ends, and a regional feeder, which is the other one of both ends, and both ends, By automatically extracting howlings that occur during multi-group calls, and implementing multi-party call & simultaneous call systems and methods for smoothly communicating multi-group calls between both ends by filtering or compensating, all feeds can be made without disconnection of the entire network. By accommodating the telephone line, it maximizes the multi-group call or broadcasting business processing environment, and thus has the first effect of improving the speed and efficiency of business processing.

In addition, the present invention implements a multi-party call & simultaneous call system and method for automatically extracting the howling generated during multi-group calls between both ends, filtering or compensation processing, thereby smoothly communicate the multi-group calls between both ends, It has a second effect of providing an online communication environment with high call sensitivity in a multi-party conference.

Claims (3)

A feeder telephone call control unit having a plurality of feeder telephone lines, recording telephone numbers of both ends of calls connected through the plurality of feeder telephone lines, and checking in real time a multi-group call state between the both ends; An automatic line switching device for monitoring in real time whether there is a malfunction of the feeder call control unit or equipment failure state, and automatically switching a plurality of feeder phone lines connected to the feeder call control unit; A handle for transmitting one of the two ends of the group call request signal to the feeder call controller using a wired or wireless communication line connected to the feeder call controller; And The dispatch telephone call control unit permits a multi-group call between the both ends, as the other end of the hem is sent to the feed telephone call control unit, which is a pre-generated group call response signal which is the other of the hem ends and responds to the group call request signal. And a local feeder configured to make a multi-group call with the handling station through a multi-group call line network connected to the plurality of feed phone lines. The feeder call control unit A telephone number of the handling desk connected to a multi-group call and a telephone number of a plurality of regional feeding units having a plurality of feeding telephone lines and connected through a multi-group calling line network designed from the plurality of feeding telephone lines; A main apparatus for checking in real time the multi-group call connection state between the local power supply units of the; And It is provided with a plurality of feeder telephone lines, and when a malfunction or equipment failure occurs in the main device, the multi-group call call control of the main device and the telephone number of the handling device are switched from the standby mode to the active mode. And an auxiliary device, which substitutes the telephone numbers of the plurality of local power supply units and inherits the multi-group call line network of the main device as it is, wherein the main device / auxiliary device includes: A first display device which stores the telephone numbers of the plurality of local feeders and the telephone numbers of the handling desks, and wherein the multi-state calls are connected when the multi-group calls are connected between the handling stations and the plurality of local feeders. Local feeder card indicating through; Storing the telephone numbers of the handles and the telephone numbers of the plurality of regional feeders, wherein the handling units convert the telephone numbers of the plurality of regional feeders into respective shortcut touch numbers, and screen-touch each of the shortcut touch numbers. A handling card for displaying the call state connected to the multi-group call through a second display device provided as a multi-group call with the plurality of local power supply units; Howling for compensating the howling which is a noise signal generated by the delay time automatically generated by the multi-group call between the handling station and the multiple feeders, and automatically extracting and filtering the howling generated during the delay time. Removal unit; And And a common control unit for signal processing of the area feeder card, handling card, and howling remover, and checking the state of the multi-group call connected call in real time. delete A feeder telephone call control unit having a plurality of feeder telephone lines, recording telephone numbers of both ends of calls connected through the plurality of feeder telephone lines, and checking in real time a multi-group call state between the both ends; Monitoring, by the automatic line switching device, whether a malfunction of the feeder call control unit or a malfunction of the equipment is performed in real time, and automatically switching a plurality of feeder phone lines connected to the feeder call control unit; A handling unit having one of the both ends transmits a predetermined parasitic group call request signal to the feeder telephone call controller using a wired or wireless communication line connected to the feeder telephone call controller; And Transmitting, by the regional feeding unit, the other one of the hem, a predetermined parasitic group call response signal in response to the group call request signal to the feeding telephone call controller; Permitting, by the feeder telephone call control unit, a multi-group call between the handling station and the local feeding unit in response to receiving the group call request signal of the handling station and the group call response signal of the local feeding unit; Allowing the feeder call control unit to permit the multigroup call so that the handle and the local feeder perform a multigroup call through a multigroup call line network connected to the plurality of feeder lines; And When the multi-group call transfer between the handle and the local feeder, the feeder call control unit extracts the already generated howling for a predetermined delay time, and then filters or compensates the processing. The feeder call control unit A telephone number of the handling desk connected to a multi-group call and a telephone number of a plurality of regional feeding units having a plurality of feeding telephone lines and connected through a multi-group calling line network designed from the plurality of feeding telephone lines; A main apparatus for checking in real time the multi-group call connection state between the local power supply units of the; And It is provided with a plurality of feeder telephone lines, and when a malfunction or equipment failure occurs in the main device, the multi-group call call control of the main device and the telephone number of the handling device are switched from the standby mode to the active mode. And an auxiliary device, which substitutes the telephone numbers of the plurality of local power supply units and inherits the multi-group call line network of the main device as it is, wherein the main device / auxiliary device includes: A first display device which stores the telephone numbers of the plurality of local feeders and the telephone numbers of the handling desks, and wherein the multi-state calls are connected when the multi-group calls are connected between the handling stations and the plurality of local feeders. Local feeder card indicating through; Storing the telephone numbers of the handles and the telephone numbers of the plurality of regional feeders, wherein the handling units convert the telephone numbers of the plurality of regional feeders into respective shortcut touch numbers, and screen-touch each of the shortcut touch numbers. A handling card for displaying the call state connected to the multi-group call through a second display device provided as a multi-group call with the plurality of local power supply units; Howling for compensating the howling which is a noise signal generated by the delay time automatically generated by the multi-group call between the handling station and the multiple feeders, and automatically extracting and filtering the howling generated during the delay time. Removal unit; And And a common control unit for signal processing of the area feeder card, the handling card, and the howling remover, and checking the state of the multi-group call connected call in real time.

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