KR20010044618A - Apparatus and method for displaying caller id in private branch exchange - Google Patents

Abstract

The present invention relates to an apparatus and a method for displaying caller identification information of a private switching network, and in particular, the apparatus of the present invention is connected to a private exchange for switching at least one or more trunk lines and at least one subscriber line in response to a call signal. A display apparatus, comprising: a first interface unit connected to a private exchange to receive caller identification information and receiver call information; and a computer connected to a telephone connected to at least one subscriber line of the private exchange through a LAN network. A second interface unit for calling the caller identification information and the caller identification information corresponding to the telephone called from the caller in response to the caller identification information provided from the private exchange via the first interface unit on the screen of the computer corresponding to the second interface unit. Control to display on It includes.

Therefore, in the present invention, caller identification information can be displayed through the computer screen of a user of not only a digital key phone having a liquid crystal display but also a general telephone having no liquid crystal display.

Description

Apparatus and method for displaying caller identification information in private switching network {APPARATUS AND METHOD FOR DISPLAYING CALLER ID IN PRIVATE BRANCH EXCHANGE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for displaying caller identification information of a private switching network. In particular, the caller identification information corresponding to all telephone users of a digital key phone and a general telephone connected to the private switching network can be displayed on the computer screen of each user. The present invention relates to an apparatus and a method.

While widespread use of telephony services enables convenience in life, mental stress of telephone users is increasing due to unwanted calls such as voice violence, telephone stalker or indiscriminate and frequent voice advertisements or polls.

Therefore, a caller identification service (CID: Caller-ID) display service is provided that can display the caller's telephone number or name on the display of the receiver's phone so that the caller can identify who the caller is. Is being provided.

Typically, a private exchange performs signal processing on an external trunk line call through a line connection with a local exchange. Recent private exchanges are configured to simultaneously perform signal processing by Integrated Services Digital Network (ISDN) connection and signal processing by R2. In the ISDN method, caller identification information is provided at the same time that a trunk line call is received. In the R2 method, caller identification information is requested for an incoming call.

In general, in a data communication system for wired, wireless communication and Internet access, a single frequency signal or a multi-frequency signal is used to transmit information between each other between a subscriber and a terminal device, between a terminal device and an exchange, or between an exchange and a switch.

For example, various types of subscriber services to inform subscribers of the status of the exchange, the subscriber's status, and the call progress at the exchange, and the DTMF (DUAL TONE MULTI FREQUENCY) signal and exchange that is sent to the exchange to select the subscriber. R2-MFC (MULTI FREQUENCY CODE) signals are used to convey period origination, called party number, subscriber status and billing information.

Referring to FIG. 1, the conventional private exchange 10 is installed between the local exchange 20 and the extension subscriber telephone. The private exchange 10 includes a trunk 12, an analog subscriber 14, a digital subscriber 16, and a controller 18.

The trunk portion 12 is connected to a trunk line such as an analog subscriber line of the PSTN, an E1 or T1 dedicated line, or the like. The analog subscriber unit 14 is connected to the extension subscriber phone 30, that is, a general telephone. A digital key phone (not shown) is connected to the digital subscriber unit 16.

Therefore, the configuration of connecting the caller identification information display device 40 to a conventional private exchange can be connected in three ways.

First, in case of attaching the sender information identification device to the ANALOG Subscriber Line of the local exchange network, that is, attaching it to the TRUNK side of the private exchange (42),

Secondly, when attaching to a DIGITAL Subscriber Line of a local exchange network, that is, an E1 or T1 dedicated line (44),

Third, the case may be attached to a subscriber line of the private switching network, that is, a case 46 attached to an extension subscriber line.

The caller identification information can be provided to the telephone 30 only if it is attached to the analog subscriber line 42 of the three connections. However, even in this case, it was possible to display only the key phone telephone which is a telephone having a liquid crystal display so that the telephone 30 could display caller identification information.

If it is attached to the digital subscriber line (44), the caller identification information cannot be displayed because it cannot be decoded, and if it is attached to the extension subscriber line (46), the caller identification information can be transferred from the CO card to the extension card. It is not possible to display it.

Therefore, in the conventional private exchange, it was possible to display the caller identification information only in the digital key phone telephone.

Even if the caller ID display function is added to the private exchange, it is burdensome for the user using the digital key phone to manage the caller information of all the phone users in the office or to check the displayed caller ID information and inform the user of the general telephone. In other words, the caller ID information service function in the private exchange may become a nameless function.

However, in order to properly use the caller ID display service, it may be a burden to replace the existing ordinary phone with a phone with a liquid crystal display.

Accordingly, an object of the present invention is to solve the problems of the prior art, all the telephones connected to the private exchange in the office environment of one computer and one telephone environment and all computers are interconnected by LAN network. A caller identification information display apparatus of a private switching network capable of displaying caller identification information on a computer screen corresponding to the present invention is provided.

Another object of the present invention is to provide a display method suitable for the caller identification information display apparatus of the private switching network.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for explaining the operation of a private exchange having a conventional caller identification information display function.

2 is a view for explaining the configuration of a caller identification information display apparatus of a private exchange according to the present invention;

3 is a block diagram showing the detailed configuration of the trunk connection of FIG.

4 is a configuration diagram of data generated at the trunk connection of FIG. 3;

5 is a block diagram showing a detailed configuration of a subscriber access unit of FIG.

FIG. 6 is a diagram illustrating configuration of data generated at a subscriber connection of FIG.

7 is a block diagram illustrating a detailed configuration of a network connection unit and a control unit of FIG. 2.

8 is a view showing a software configuration of a control unit according to the present invention.

9 is a view showing the software configuration of the control unit and the subscriber computer according to the present invention.

10 to 12 are flowcharts for explaining the operating state according to the present invention.

* Explanation of symbols for main parts of the drawings

10: private exchange 20: local exchange

30: subscriber phone 50: caller identification information display device

52 trunk connection portion 54 control unit

56: subscriber connection 58: network connection

60: personal computer

In order to achieve the above object, the apparatus of the present invention is connected to a private exchange for switching at least one or more trunk lines and at least one subscriber line in response to a call signal. A first interface unit for receiving caller identification information and receiver call information, a second interface unit for connecting through a LAN network with computers corresponding to a telephone connected to at least one or more subscriber lines of the private exchange, and the first interface unit; And a control unit for displaying the caller identification information corresponding to the telephone called from the caller on the screen of the corresponding computer via the second interface unit in response to the caller identification information and the receiver call information provided from the private exchange through the interface unit. It features.

In the present invention, the first interface unit is connected to a trunk line connected to the private exchange to detect the caller identification information, and is connected to the digital subscriber connection of the private exchange to receive the recipient exchange information corresponding to the caller identification information. It includes a subscriber connection.

In the present invention, the trunk connection part is connected to the trunk line, an analog front end part for impedance matching, and the analog front end part is connected to the analog front end part to reproduce E1 / T1 information as PCM data and generate a synchronization signal and a control signal. And a T1 frame logic unit, a decoder for receiving the PCM data to decode the caller identification information, and a trunk control unit configured to provide the control unit with the transmitter frame information of the channel-specific caller identification information provided through the decoder.

Trunk connection portion in the present invention can be configured in plurality. It may also include a plurality of trunk connections respectively corresponding to the analog subscriber line and the digital subscriber line.

In the present invention, the trunk connection part may further include a CCS signal relay connection part.

In the present invention, the subscriber access unit is connected to the digital subscriber connection of the private exchange, the analog front end for impedance matching, and the combo codec unit connected to the analog front end to separate the 2B1 + 1D information for each channel; D channel analyzer for analyzing D channel information provided from the combo codec unit, and exchange information frame data corresponding to information such as a state of a private exchange, a subscriber's state, and a call progress in response to the information provided from the D channel analyzer. It comprises a subscriber control unit configured to provide to the control unit.

In the present invention, the second interface unit is connected to the LAN network Ethernet connection for impedance matching, the Ethernet control unit for receiving the caller identification information display data from the control unit converts into Ethernet data and transmits to the corresponding computer through the Ethernet connection unit Include.

In the present invention, the control unit is a system operation display unit for displaying the operation status of the first and second interface unit and an alarm when an error occurs, a system monitor console unit for inputting system parameters when installing the system, and the system parameters A non-volatile memory for storing and a caller identification information display application, and the IP address of the corresponding receiver is referenced from the nonvolatile memory in response to the caller identification information provided from the first interface unit and the exchange information of the private exchange; And a microcomputer providing caller identification information display data to a computer corresponding to the IP address referred to through the second interface unit.

In the present invention, it is preferable that the second interface unit further includes an Ethernet control unit and an Ethernet connection unit to connect the control unit of the private exchanger and the control unit of the apparatus with an Ethernet network.

In the present invention, it is preferable that the trunk connection unit, the subscriber connection unit, and the control unit are each commonly connected to an external bus through an external shared memory to transmit and receive information.

In addition, in the present invention, it is preferable that the trunk connection, the subscriber connection, and the control unit connect to each other through the serial connection, and provide operation state information of each unit to the control unit.

Such a connection method between each block can adaptively cope with the signal transmission and reception environment.

The method of the present invention is connected to a private exchange switching at least one or more trunk lines and at least one subscriber line in response to a call signal to display caller identification information, the method being connected to the private exchange to exchange caller identification information. Receiving information, retrieving an IP address of a corresponding computer in response to the received exchange information, providing caller identification information to a computer corresponding to the retrieved IP address, and a caller provided at a recipient computer And displaying the identification information on the computer screen.

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

The present invention seeks to display corresponding caller identification information on each personal computer screen of all telephone users of an extension subscriber connected to a private exchange.

Specific specific examples are provided in the following to assist in understanding the present invention. However, it will be apparent to one skilled in the art that these specific specific examples are not necessarily adopted in order to practice the present invention. In other instances, configurations and operation descriptions of known private exchanges are not described in detail in order to avoid unnecessarily obscuring the present invention. The same parts as those described in FIG. 1 described above are denoted by the same reference numerals.

2, a caller identification information (related information such as caller's telephone number, name, etc.) display device 50 of the present invention comprises a first interface unit including a trunk connection 52 and a digital subscriber connection 56, A second interface unit including a network connection unit 58 and a control unit 54 are included.

The trunk connection 52 analyzes and acquires the caller's telephone number and related information on the subscriber line of the local switching network.

The subscriber access unit 56 is connected to the digital subscriber unit 16 of the private exchange 10 to analyze and acquire trunk line and extension exchange information.

The network connection unit 58 interconnects the display device of the present invention with the station subscriber's computer.

The controller 54 controls the respective parts of the display device of the present invention.

The computer 60 is a personal computer that corresponds 1: 1 to each telephone of the extension subscriber, and displays the caller's telephone number and related information provided from the display device of the present invention on the computer monitor screen.

Referring to FIG. 3, the trunk connection part 52 of the present invention is connected to an E1 or T1 dedicated line between the local exchange 20 and the private exchange 10 so that the local exchange 20 and the private exchange 10 exchange with each other. The sender identification information is analyzed and transmitted to the control unit 54.

The trunk connection unit 52 includes an analog front end (AFE) 52a, an E1 / T1 frame logic unit 52b, an R2-MFC signal processor 52c, a CCS signal processor 52d, and an internal share. A memory 52e and a trunk control section 52f. Each part is connected to each other via the internal bus 52g.

The AFE 52a is composed of a digital transformer and passive elements for impedance matching of E1 or T1 dedicated lines between the local exchange 20 and the private exchange 10, and receives the E1 / T1 information received from the local and private exchange E1 / T1. Transfers to T1 FRAMER LOGIC unit 52b.

The information transfer protocol exchanged between the local exchange 20 and the private exchange 10 may be an R2-MFC (MULTI FREQUENCY CODE) protocol or a common line signal (CCS) that is mainly used in a channel associated signaling (CAS) method. : CCITT NO. Which is used mainly in the common channel signaling method. There are seven protocols.

Accordingly, the trunk connection 52 of the present invention includes a common line signal (CCS: COMMON) and an R2-MFC signal processor 52c capable of analyzing R2-MFC mainly used in a CHANNEL ASSOCIATED SIGNALING (CAS) method. A CCS signal processor 52d for analyzing the relay signal between stations by connecting to the CHANNEL SIGNALING method is built in.

The E1 / T1 frame logic unit 52b may be configured to provide the information of 2.048 Mbps or 1.544 Mbps so that the R2-MFC signal processor 52c can process the E1 or T1 information received from the local exchange 20 and the private exchange 10. Plays back in PCM (PULSE CODE MODULATION) frames.

In addition, the E1 / T1 frame logic unit 52b reproduces the synchronization and control signals on the E1 / T1 and transfers the data to the internal bus 52g of the TRUNK connection unit 52.

The PC48 frame of 2.048 Mbps or 1.544 Mbps transmitted from the E1 / T1 frame logic unit 52b is transmitted by the R2-MFC signal processor 52c for each PCM channel and subjected to the MFC decoding algorithm. 52g) is stored in the internal shared memory 52e.

The trunk controller 52f includes a microcomputer MCU1, an RS-232 serial connection SIF1, and an external shared memory OCM1. The microphone computer MCU1 responds to synchronization and control signals on the E1 / T1 reproduced by the E1 / T1 frame logic unit 52b and DATA stored in the internal shared memory 52e for each channel in the R2-MFC signal processor 52c. The caller ID of FIG. 4 is generated and the generated caller ID is output to the external bus 59b through the external shared memory OCM1. The microcomputer MCU1 provides an operation state signal of each unit to the serial bus 59a through the serial connection unit SIF1.

The sender identification information of FIG. 4 includes a transmission start signal (STX), a channel number (CHANNEL NO), a caller's telephone number, a receiver extension number, a transmission BYTE length, an error correction code (CRC), and a transmission termination signal (ETX).

Referring to FIG. 5, the subscriber access unit 56 of the present invention is connected to the digital subscriber unit 16 of the private exchange 10.

The information transmission protocol of the DIGITAL key-phone telephone attached to the private exchange 10 and the private exchange 10 is exchanged with each other through the single twisted pair pair. It acts as a U ”interface.

Accordingly, the DIGITAL subscriber access unit 56 needs a D-CHANNEL signal analysis capable of acquiring information such as the exchange status, the called subscriber status and the call progress status of the private exchange 10 loaded on the D-CHANNEL.

In other words, the subscriber access unit 56 is connected to the private exchanger and the digital transfer unit of the 2B + D TYPE of ISDN BRI (BASIC RATE INTERFACE) between the private exchange 10 and the DIGITAL keyphone telephone attached to the private exchange 10. The phone analyzes and exchanges information such as the state of the private exchange, the subscriber's state, and the call progress with each other, and transmits the information to the controller 54.

Accordingly, the subscriber access unit 56 includes an analog front end 56a, a 2B + 1D combo codec unit 56b, a D channel signal processor 56c, an internal shared memory 56d, and a subscriber controller 56e. The shared memory 56d and the subscriber controller 56e are connected via an extension bus 56f.

The analog front end part 56a is composed of a 2B + D TYPE information transfer part of the ISDN BRI of the digital subscriber part of the private exchange 10 and a digital transformer and passive elements for impedance matching.

The combo codec unit 56b is connected to the AFE unit 56a to receive 2B + 1D information, and divides the received information into two B-CHANNEL information of 128 Kbps and one D-CHANNEL information of 16 Kbps.

The D-CHANNEL signal analyzer 56c interprets the received D channel information and stores the information in the internal shared memory 56d.

The subscriber controller 56e includes a microcomputer MCU2, an RS-232 serial connector SIF2, and an external shared memory OCM2.

The microcomputer (MCU2) takes the D-CHANNEL information stored in the internal shared memory 56d, generates the exchange information shown in FIG. 6 with reference to information such as the state of the private exchange, the called party status, and the call progress. It transfers to the external bus 59b through the shared memory OCM2. In addition, the subscriber control unit provides an operation state signal of the subscriber connection unit 56 to the control unit 54 through the serial connection unit SIF2.

The exchange information of FIG. 6 includes a transmission start signal STX, a channel number CHANNEL NO, a receiver status, a receiver number, a transmission BYTE length, an error correction code CRC, and a transmission termination signal ETX.

Referring to FIG. 7, the control unit 54 according to the present invention includes a system operation display unit 54a, a system monitor console unit 54b, a nonvolatile RAM 54c, a microcomputer 54d, an EEPROM 54e, and external sharing. Memory 54f and serial connector 54g. Each part is connected to each other via an internal bus 54h.

The network connection 58 is connected to the internal bus 54h of the control unit 54, and has a first Ethernet controller 58a, a first Ethernet connection 58b, a second Ethernet controller 58c, and a second Ethernet connection 58d. ).

The control unit 54 of the present invention operates as a server that serves as a client the personal computers of each subscriber telephone user through an in-house Ethernet network. The control unit 54 is connected to the private exchange via the trunk connection unit 52 and the subscriber connection unit 56 so as to receive caller identification information and exchange information, and to display the caller identification information on the monitor screen of the computer through the network. do.

The system operation display unit 54a displays an operation state signal of each unit provided from the outside through the serial connection unit 54g, and emits an operation state so that an operator can display and recover the ALARM in the event of an operation state of the device of the present invention and an error to the operator. Display through a display lamp such as a diode. That is, as the display, alarm, and alarm interrupt module existing on the application layer is driven, the operation status of the trunk connection part and the DIGITAL subscriber connection part is displayed by LED, and the alarm is displayed by the alarm when an error occurs.

The system monitor console portion 54b serves as an interface for inputting various system parameters by the engineer at the time of installation of the present invention. In other words, the system monitor console can be connected to an engineer computer through an RS232 serial bus or a universal standard bus (USB).

The EEPROM 54e and the nonvolatile RAM 54c store various input parameters, caller identification information and exchange information provided from the trunk connection portion and the subscriber connection portion. In the present invention, by configuring the memory of the controller as a nonvolatile memory, it is possible to prepare for a non-powered state or a power failure state.

The microcomputer 54d stores, in the nonvolatile RAM 54c, caller identification information and exchange information provided through the external shared memory OCM3.

The microcomputer reconstructs the computer display data with reference to the provided caller identification information and the exchange information, and then transmits it to each personal computer through the network connection 58.

Network connection 58 includes two network ports. One port is connected to the internal Ethernet network, and the other port is connected to the Ethernet port of the private exchange 10. The first Ethernet controller 58a and the first Ethernet connection 58b constituting the first port provide caller identification indication data provided from the microcomputer 54d to each personal computer. The second Ethernet controller 58c and the second Ethernet connection 58d constituting the second port are passages for receiving information such as the state of the private exchange, the incoming subscriber state, and the call progress from the control unit of the private exchange 10. It is used as.

Referring to FIG. 8, the software configuration of the microcomputer 54d includes an application program for calling party number display, a standard protocol for network communication (TCP / IP, PPP), multitasking, and real time processing (RTOS). SYSTEM) KERNEL, device drive, MAC, physical layer.

In the microcomputer 54d, the TCP / IP protocol is used to transfer information created on an application program to a network based on a standard protocol, and an application program that functions as a server on the network is a daemon on the application layer. After receiving the transmission frame including the sender identification information from the trunk connection and the transmission frame including the exchange information provided from the digital subscriber connection, the data is processed into displayable data on the screen of the client personal computer connected to the network. Send to TCP / IP layer.

9, a protocol hierarchy for network communication between a controller 54 serving as a server and a client personal personal computer includes a physical layer, a MAC data link layer, a TCP / IP network layer, each having a transmission rate of 10 to 100 Mbps, It consists of application layers.

As described above, in the present invention, in response to the exchange information of the private exchange, the sender identification information is loaded on the IP address of the recipient's personal computer and transmitted to the corresponding computer through the Ethernet network, and the received sender identification information is received from the computer. It is displayed on the screen on the installed caller ID display program.

Referring to FIG. 10, the trunk connection unit 52 detects an incoming call on a trunk line (102) and analyzes an incoming call (104).

The CID signal is detected from the incoming call (106), and the caller identification information is reproduced from the detected CID signal and stored in the internal shared memory of the trunk connection unit (108).

The trunk controller takes the caller identification information stored in the internal shared memory and generates the caller identification information transmission frame of FIG. 4 (110). The generated transmission frame is stored in the external shared memory and transmitted to the control unit 54 (112).

Meanwhile, referring to FIG. 11, the subscriber access unit 56 receives information from the digital subscriber unit of the private exchange, such as the state of the exchange, the called subscriber state, the call progress, and stores the information in the internal shared memory (114). Subsequently, the subscriber control unit takes information stored in the internal shared memory and generates an exchange information transmission frame of FIG. 6 (116). The generated transmission frame is stored in the external shared memory and transmitted to the controller 54 (118).

Referring to FIG. 12, the control unit 54 takes caller identification information transmission frames and exchange information transmission frames provided to the external shared memory (120, 122) and retrieves recipient IP addresses corresponding to the exchange number of the called subscriber from these data. (124).

The caller's telephone number indication data is added to the retrieved IP address (126) and transmitted to the corresponding personal computer through the network connection 58 (128).

Therefore, the computer displays the received caller phone number display data on the monitor screen.

Therefore, the extension subscribers of the private exchange can view the caller's telephone number that has arrived at them through their computer, and can easily determine whether or not to answer the call by looking at the displayed telephone number.

Although the components of the invention have been described in connection with specific embodiments, the invention may be implemented in numerous other ways. In conclusion, the particular embodiments depicted in the description are not intended to be interpreted in a limiting sense. Reference to specific parts of this embodiment is not intended to limit the scope of protection of the claims, which describes only the features regarded as essential components of the invention.

As described above, in the present invention, by displaying the caller identification information through the receiver's computer, the caller's telephone display is possible even for a telephone user without a liquid crystal display window.

In addition, by displaying the caller's telephone number on the computer screen, the receiver can easily check the caller's telephone number even during computer operation, and it is possible to manage the caller's telephone number on each computer.

Since the caller identification information display apparatus of the present invention can all be connected to a trunk line, an extension, or a controller of a private exchange, it is possible to adaptively install various types of private exchanges.

In addition, each block of the present invention is easy to maintain and configure by transmitting and receiving data in a mutually shared memory system, and by transmitting and receiving operation state information in a serial connection.

Claims (10)

An apparatus for displaying caller information connected to a private exchange for switching at least one or more trunk lines and at least one subscriber line in response to a call signal, the apparatus comprising: A first interface unit connected to the private exchange to receive caller identification information and receiver call information; A second interface unit for connecting through a LAN with computers corresponding to a telephone connected to at least one subscriber line of the private exchange; A control unit for displaying caller identification information corresponding to a telephone called from the caller on the screen of the corresponding computer via the second interface unit in response to caller identification information and receiver call information provided from the private exchange through the first interface unit; Caller identification information display device of the private exchange network characterized in that it comprises. The method of claim 1, wherein the first interface unit A trunk connection unit connected to a trunk line connected to the private exchange to detect caller identification information; And And a subscriber access unit connected to the digital subscriber access unit of the private exchange to receive the recipient exchange information corresponding to the caller identification information. According to claim 2, wherein the trunk connection portion An analog front end unit connected to the trunk line for impedance matching; An E1 / T1 frame logic unit connected to the analog front end to reproduce E1 / T1 information as PCM data and to generate a synchronization signal and a control signal; A decoder which receives the PCM data and decodes caller identification information; And And a trunk control unit configured to provide the control unit with the sender identification information for each channel provided through the decoder as transmission frame data. The method of claim 2, wherein the subscriber access unit An analog front end portion connected to the digital subscriber connection of the private exchange for impedance matching; A combo codec unit connected to the analog front end unit to separate 2B1 + 1D information for each channel; A D channel analyzer for analyzing D channel information provided from the combo codec unit; And a subscriber control unit configured to provide information to the control unit in response to the information provided from the D channel analyzer, such as the state of the private exchange, the caller's state, and the call progress, etc. as corresponding receiver context frame data. Caller identification information display device of a private exchange network. The method of claim 2, wherein the second interface unit An Ethernet connection unit connected to the LAN network for impedance matching; And an Ethernet control unit which receives the caller identification information display data from the control unit, converts the caller identification information display data into Ethernet data, and transmits the same to the corresponding computer through the Ethernet connection unit. The method of claim 2, wherein the control unit A system operation display unit for displaying operation states of the first and second interface units and displaying an alarm when an error occurs; A system monitor console unit for inputting system parameters during system installation; Nonvolatile memory for storing the system parameters; And A caller identification information display application program is executed, in response to the caller identification information provided from the first interface unit and the exchange information of the private exchange, the IP address of the corresponding receiver is referred to from the nonvolatile memory, and is referred to through the second interface unit; And a microcomputer unit for providing caller identification information display data to a computer corresponding to the received IP address. A method of displaying caller identification information connected to a private exchange switching at least one or more trunk lines and at least one subscriber line in response to a call signal, the method comprising: Receiving caller identification information and exchange information from the private exchange in response to a call reception; Retrieving an IP address of a corresponding computer in response to the received exchange information; Providing caller identification information to a computer corresponding to the retrieved IP address; And displaying caller identification information provided from the recipient computer on a computer screen. 8. The method as claimed in claim 7, wherein the IP address corresponds to 1: 1 with an exchange number of an extension subscriber of the private exchange. The method as claimed in claim 7, wherein the caller identification information is detected from a trunk line connected to the private exchange, and the exchange information is provided from a digital subscriber unit of the private exchange. An apparatus for displaying caller information connected to a private exchange for switching at least one or more trunk lines and at least one subscriber line in response to a call signal, the apparatus comprising: A caller identification information display control device connected to the private exchange to receive caller identification information and exchange information, and output display data including an IP address and caller identification information of a corresponding computer to the Ethernet network in response to the exchange information. ; And Each of the telephones connected to the subscriber line of the private switching center has an IP address corresponding to each of the telephones, and is connected to the caller identification information display apparatus through the Ethernet network. And at least one subscriber computer for displaying on a computer screen.