KR20030063064A - Method and System for Providing a CTI Service for Extention Terminal by Using an IP-PBX - Google Patents

Abstract

PURPOSE: A method and a system for furnishing a CTI(Computer Telephony Integration) service to an extension terminal by using IP-PBX(Internet Protocol-Private Branch Exchange) are provided to furnish a VMS(Voice Mail Service) function and a call forwarding function to an extension client by using the IP-PBX enabling a phone call over the Internet. CONSTITUTION: An extension client installs a CTI program for a client in a CTI computer(S502). The extension client executes the installed CTI program(S504). The extension client sets up an extension phone to be used with the CTI computer(S506). The extension client selects and sets up a desiring CTI service(S508). If the extension client selects a function to store contents of a call in the extension phone(S510), a CPU of the CTI computer generates CTI service request data based on terminal information stored in a terminal information storage and transmits the generated data to a VMS over the Internet, to set up the function to store contents of a call(S512). The extension clients performs a phone call by using the extension phone(S514). If a CTI service button is clicked, the CPU generates control data for starting the CTI service to transmit the generated control data to the VMS and transmits control data for performing the CTI service to an IP-PBX(S518). The IP-PBX transmits call contents of the extension phone to the VMS, and the VMS stores the transmitted data in a voice mail-box(S520).

Description

Method and System for Providing a CTI Service for Extention Terminal by Using an IP-PBX}

The present invention relates to a method and system for providing a computer telephony integration (CTI) service to an extension terminal using an Internet Protocol-Private Branch Exchange (IP-PBX), and more particularly to an IP-PBX capable of a telephone call over the Internet. The present invention relates to a method and a system for providing a CTI service to an extension terminal using an IP-PBX that can provide a voice mail (VMS) function and an auto attendant CTI service to an extension client using .

The technology that combines the functionality of a computer and a phone is called CTI. The CTI combines the functionality of a computer into a telephone, giving end users the ability to transfer current telephone service and various data information from their computers. In addition, CTI can be applied to a network to provide additional services such as video conferencing, where digital meetings are used to capture the content of meetings of multiple people within an enterprise. CTI is used in call centers that manage incoming and outgoing call requests to and from the enterprise, customer support centers that need to handle customer service tasks quickly, and telemarketing operations that are primarily over the telephone.

1 is a block diagram schematically showing the configuration of a conventional CTI system.

The CTI system is connected to a Public Switched Telephone Network (PSTN) 110, which performs functions such as transmission and exchange for telephony, and a plurality of trunk line terminals 112 through which a telephone call is connected to the PSTN 110. 116), a PBX (120: Private Branch Exchange) that is connected to the PSTN 110 and performs an exchange function for call requests from a plurality of trunk line terminals 112 to 116, and a customer consultation request from a customer. Call Center (130), which provides counseling services by connecting to agents in the fields of interest using the Audio-Response System (ARS) function, and voice as well as data using standard protocol IP (Internet Protocol). Internet phones that make calls based on Voice over Internet Protocol (VoIP), which allows them to be carried together, and phone terminals 112 to 116 that make voice calls based on the PSTN 110, and private phones. VoIP gateway 140, which switches to make telephone calls between each other by integrating extension phones connected to a switchboard (PBX), router 150 that switches to establish a transmission path of data, and computers scattered between remote locations. Internet 160 as a network for communication of the network.

In addition, the CTI system connects to the Internet 160 to execute an Internet phone program or to a specific website that provides Internet phone service, and executes a telephone call with the general telephones 112 to 116 or the call center 130. Call center 130 or agent terminal for consultation request from CO line terminals 112 to 116 or Internet phone clients 162 to 166 with a plurality of Internet phone clients 162 to 166 and a call distribution function. CTI server 170 for controlling the call to set up the call (192 ~ 196), the member database 180 that stores the personal information of the members registered in the call center 130, the telephone call for consultation requests from customers It consists of a plurality of counselor terminals (192 ~ 196) and the like to perform a consultation.

In the conventional CTI system configured as described above, when a customer such as the telephone terminals 112 to 116 or the Internet phone clients 162 to 166 calls the call center 130, the call center 130 is a member database ( 180 reads information about the caller from the customer and displays the information on the screen of each of the agent terminal (192 ~ 196), each agent watching the customer's connection status displayed on the screen of the terminal (192 ~ 196) Respond appropriately, such as conducting consultations on service needs. That is, the call center 130 may provide a professional counseling service by using an ARS (Automatic Response System) to induce a connection with a counselor in a desired field. In addition, as necessary, the consultation contents with the customer are recorded and used for marketing and other activities. The CTI system is being used as a system for improving the efficiency of marketing or work of each company by being installed and spread in the fields of banking and other fields such as communication, manufacturing, and distribution.

In the above, the CTI system has been described in the case where only the call center 130 is connected to the private exchange 120, but instead of the call center 130, an automatic answering system (ARS) or a voice mail system (VMS) is connected. Therefore, each terminal provides an answering machine or a voice mailbox function. Among them, the voice mailbox system listens to the person who sets the function for the missed call based on the function of recording, storing, rehearing, and deleting the caller's voice. It allows you to record a message and automatically transmits the recorded content to your mobile phone.

However, in order for an individual to use the above functions, the terminal to be used must be a terminal having various functions capable of performing the above functions. Most of the terminals are used for the trunk line terminal, but the terminal for the extension is widely used in corporations and public offices. In the case of the trunk line terminals 112 to 116, a terminal having a function of checking a caller's telephone number, a temporary storage function of a telephone call, a missed call forwarding function, etc., in addition to a telephone call is also used to call using these functions. It can be harmonized with the center 130 in terms of functionality.

On the other hand, corporate and public offices use terminals for CO lines, but most employees use extension phones. Such extension telephones have simple functions such as redialing, trunk line switching, and on-hook to talk on speakerphones as well as phone calls. Therefore, there is a limit to providing services of call center 130 or voice mailbox system. there was.

Therefore, there has been a demand for a function that can increase work efficiency by adding and utilizing various functions without incurring an economic burden on the individuals who use the extension terminal in which only simple functions are provided in addition to the voice call.

In order to solve the above problems and meet the above requirements, the present invention provides a voice mailbox (VMS: Voice Mail Service) as an extension client using Internet Protocol-Private Branch Exchange (IP-PBX), which enables telephone calls to the Internet. The purpose of the present invention is to provide a method and system for providing CTI services to an extension terminal using IP-PBX that can provide computer telephony integration (CTI) services such as functions and call forwarding functions.

1 is a block diagram schematically showing the configuration of a conventional CTI system;

2 is a block diagram schematically showing the configuration of a system for providing a CTI service to an extension terminal using an IP-PBX according to an embodiment of the present invention;

3 is a block diagram showing an internal configuration of an IP-PBX;

4 is a block diagram showing an internal configuration of a CTI computer;

5 is a flowchart illustrating a CTI service for storing contents of a call of an extension terminal;

6 is a flowchart illustrating a CTI service for switching a call in an extension terminal.

<Description of Symbols for Main Parts of Drawings>

110: PSTN112 ~ 116: trunk line terminal

120: PBX130: call center

140: VoIP gateway 150: router

160: Internet 162 ~ 166: Internet phone client

170: CTI Server 180: Member Database

192 ~ 196: Agents 210, 212: IP-PBX

220, 230, 240, 250, 260: Extension client

222, 232, 242, 252, 262: CTI computer

224, 234, 244, 254, 264: Extension telephone

270: voice mailbox system (VMS) 310: main control unit (SCM)

320: CTI processing unit 330: trunk line matching unit (PSM)

340: station matching unit (SSM) 350: digital signal processing unit (VSM)

410: CTI program unit for the client 420: Voice processing unit

430: key input unit 440: terminal information storage unit

450: network interface card 460: monitor

470: central processing unit

In order to achieve the above object, the present invention provides a voice mail service (VMS) function and a call forwarding function to an extension client by using an Internet Protocol-Private Branch Exchange (IP-PBX) equipped with an Internet telephone call function. A method of providing a CTI service to an extension terminal using an IP-PBX that provides a computer telephony integration (CTI) service, the method comprising: (a) installing a CTI program for a client that can set the CTI service to the extension client; Step, (b) executing the client CTI program installed in the extension client, (c) setting a CTI service to be provided to the extension client, (d) requesting a telephone call to the extension client Is received, and (e) executing the set CTI service extension, characterized in that it comprises the IP-PBX extension It provides a CTI service method of the terminal.

In addition, the present invention provides a voice mail (VMS) function and a CTI (automatic exchange) function to a plurality of extension terminals using an Internet Protocol-Private Branch Exchange (IP-PBX) having an Internet telephone call function. In a system for providing a CTI service to an extension terminal using an IP-PBX that provides a Telephony Integration) service, it is possible to transmit and receive various types of digital data as well as analog voice information through the Internet. IP-PBX (Internet Protocol Private Exchange) which provides not only a call but also a call function and a CTI service function between the extension terminal and another terminal connected to the Internet, and is connected to the Internet and integrated with one extension terminal. The CTI service is executed by the integrated terminal for executing the client CTI program. So that control can be provided with features that include a computer for CTI.

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

2 is a block diagram schematically showing the configuration of a system for providing a CTI service to an extension terminal using an IP-PBX according to an embodiment of the present invention. In Fig. 2, the same components as those in Fig. 1 are denoted by the same reference numerals, and the detailed description thereof has already been described and thus will be omitted.

In FIG. 2, a system for providing a CTI service to an extension terminal using an IP-PBX according to an embodiment of the present invention enables the transmission and reception of various digital data as well as analog voice information through the Internet 160. Voice calls (VMS: Voice Mail Service), as well as calls between (224, 234, 244, 254 and 264), as well as calls using extension phones (224, 234, 244, 254 and 264) and computers connected to the Internet An IP-PBX (210, 212: Internet Protocol Private Exchange) that provides CTI service functions, such as a function, an auto exchange function, is connected to the Internet 160 via a router 150. One or more IP-PBXs 210 and 212 are installed in one building or area according to the service area, and FIG. 2 shows an example of installing one in each of A and B areas.

The IP-PBXs 210 and 212 are connected to a plurality of extension clients 220, 230, 240, 250, and 260. In the case of one extension client 220, the CTI computer 222 and the extension telephone ( 224 is integrally configured. The other extension clients 230, 240, 250, and 260 are similarly configured with the CTI computers 232, 242, 252, and 262 and the extension telephones 234, 244, 254 and 264. When the IP-PBXs 210 and 212 are installed, the administrator provides the client with the CTI program for the plurality of extension clients 220, 230, 240, 250, and 260, thereby providing a plurality of extension clients 220, 230, and 240. , 250, 260 may install it on the CTI computer 222 and thereby receive CTI services. The client CTI program may be distributed on a software compact disc (CD) or downloaded and installed through the Internet 150. The CTI computers 222, 232, 242, 252 and 262 have their own unique Internet addresses (IPs) and are integrated into the extension telephones 224, 234, 244, 254 and 264 respectively by executing the client CTI program. ) And CTI service can be provided.

In addition, based on the ability to record, save, rehearse, and delete the caller's voice, the person who has set the function for the missed call can hear the greeting and have the caller record the message. And a VMS (270: Voice Mail System) that executes a function of automatically transmitting the recorded contents to the extension clients 220, 230, 240, 250, and 260 and listening to the Internet 160. Connected.

3 is a block diagram schematically illustrating an internal configuration of the IP-PBX1 210. Since other IP-PBXs including the IP-PBX2 212 have the same configuration, the IP-PBX1 210 will be described as a representative.

In FIG. 3, the IP-PBX1 210 is a main control unit (SCM) 310 for controlling, managing, and maintaining a device, and a call request or CTI applied to the digital signal processing unit 340 from the Internet 160. CTI processing unit 320 for processing data related to the service request or the call request through the station matching unit 330, a public line matching unit (PSM: Public Switch Module, 330) for analog trunk line connection, for the extension phone connection An extension matching unit (SSM: Subscriber Switch Module, 340), and a digital signal processing unit (VSM: VoIP Switch Module, 350) for VoIP control and the like.

The trunk line matching unit 330 of the IP-PBX1 210 is connected to a plurality of trunk line terminals (not shown) through a PSTN (not shown), and the extension lines 340 are extension phones 224 and 234. , 244 are connected.

The CTI processor 320 transmits the call request data to the digital signal processor 350 to generate call request data from a terminal connected to the trunk line matching unit 330 and the station matching unit 340, and the digital signal processor 350. When CTI service request data is received, the CTI service request data is transmitted to the VMS 270 to execute the CTI service to the CTI service target terminal.

The digital signal processor 350 generates a digital tone signal corresponding to a dual tone multi-frequency tone (TMF) tone signal under the control of the main controller 310, and the trunk line matching unit 330 or extension matching. The analog voice signal input from the unit 340 is converted into a digital signal or processed, or the digital signal input from the router 1 150 is converted into an analog signal and processed, and a function of canceling echo is performed.

4 is a block diagram showing the internal structure of the CTI computer 222. As shown in FIG. Since the other CTI computers 232, 242, 252, and 262 have the same configuration, the CTI computer 222 will be described as a representative.

The CTI computer 222 is a client CTI program that stores a program for setting up the CTI service and a file related thereto so that the extension telephone 224 integrated with the CTI computer 222 can receive the CTI service. The voice processing unit 420, which performs a function of converting voice data applied from the Internet 160 into a voice signal or converting voice input from a user into voice data, executes a CTI program for a client. A key input unit 430 for selecting or inputting terminal information data of the extension telephone 224 integrated with the CTI computer 222, and a terminal of the extension telephone 224 integrated with the CTI computer 222 Terminal information storage unit 440 for storing information data, the network interface card 450 connected to the Internet 160 for communication with a plurality of extension clients (220 ~ 260) Net a work interface card (hereinafter referred to as a NIC), a monitor 460 for outputting the operating state of the CTI computer 222 to a screen, and an extension telephone unit which is integrated with the CTI computer 222 by executing a client CTI program ( 224 may include a central processing unit 470 (CPU) for controlling the entire apparatus so that the CTI service can be provided. The key input unit 430 includes a keyboard for inputting data such as a mouse and text for selecting and inputting one of the data output to the monitor 460.

Next, a method of providing a CTI service to an extension terminal using an IP-PBX according to an embodiment of the present invention will be described in detail with reference to the flowcharts shown in FIGS. 5 and 6.

5 is a flowchart illustrating a CTI service for storing contents of a call of an extension terminal.

First, in describing the operation of the IP-PBX, the IP-PBX1 210 will be described as a representative. When the IP-PBX1 210 is installed in the area A, a plurality of extension telephones 224, 234, and 244 are connected to the extension matching unit 340 of the IP-PBX1 210. The plurality of extension clients 220, 230, 240 using these multiple extension phones 224, 234, 244 are each equipped with CTI computers 222, 232, 242. Here, the CTI computer means a computer on which a client CTI program is installed in a general computer. The client 1 220 for the extension uses the CTI computer 1 222 and the phone 1 224 for the extension respectively. Similarly, the remaining extension clients 230 and 240 and the extension clients 250 and 260 in the region B use the CTI computer and the extension telephone as a unit. In this case, the extension clients 220, 230, 240, 250, and 260 install and use the client CTI programs in their CTI computers 222, 232, 242, 252, and 262.

That is, the extension client 220 is installed on the CTI computer 222 using a CD (Compact Disk) containing the CTI program for the client, or a website for guiding the IP-PBX1 210 to the Internet 160 ( (Not shown) to download and install the client CTI program (S502). The CPU 470 of the CTI computer 1 222 stores the files necessary for executing the CTI program in the client CTI program unit 410 and creates a CTI program execution icon on the desktop for Windows.

The extension client 220 operates the key input unit 430 of the CTI computer 222 to execute the CTI program (S504). Although not shown, the CTI program includes a plurality of menu buttons for recording, storing, rehearing, and deleting a call, forwarding a call to another phone when not in use, and setting an missed announcement message. And it includes the function of setting the extension telephone 224 used integrally. The setting of the extension telephone 224 to be used integrally is to set the IP (Internet Protocol) address of the IP-PBX1 210 to which the extension telephone 224 is connected and the extension number of the extension telephone 224.

The extension client 220 sets the CTI service that the client wants to be provided in the first screen on which the CTI program is executed. First, the extension client 220 sets the extension telephone 224 to be used integrally with the CTI computer 222 (S506). When the extension client 220 inputs the information of the extension telephone 224, for example, an IP address and an extension number (for example, 100) or the like using the key input unit 430, the CPU of the CTI computer 222 ( 470 stores the input information of the extension telephone 224 in the terminal information storage unit 440.

Next, the extension client 220 selects and sets the CTI service to be provided by the client 220 (S508). For example, when a call is made, a function of storing call details is selected and set. When the extension client 220 selects and inputs a function for storing a telephone call to the extension terminal 224 using the key input unit 430 (S510), the CPU 470 of the CTI computer 222 By generating CTI service request data based on the terminal information stored in the terminal information storage unit 440 and transmitting the CTI service request data to the VMS 270 via the Internet 160, the VMS 270 passes through the IP-PBX1 210. A function of storing the contents of the call to the extension telephone 224 having the extension number " 100 " That is, the CTI service of the extension telephone 224 is set as a function of storing the call contents (S512).

Subsequently, the extension client 220 executes a telephone call using the extension telephone 224 while the CTI computer 222 is turned on to execute the CTI program (S514). If you need to save a call while you are in a call, what you are currently doing by clicking on the "CTI Service" button running the CTI service set up by the CTI program on your CTI computer 222 while making a phone call. In operation S516, the CTI service is stored.

When the CTI computer 222 inputs the "CTI Service" button by the CTI program, the CPU 470 generates and transmits control data for starting the CTI service to the VMS 270, and transmits the current data. The control telephone for transmitting the CTI service is also transmitted to the IP-PBX1 210 to which the line telephone 224 is connected (S518). The data for executing the CTI service includes the terminal information of the extension telephone 224, that is, the extension number. In the IP-PBX1 210, when the CTI processing unit 320 receives data for executing the CTI service from the CTI computer 222, the call of the extension telephone 224 corresponding to the extension number included in the received data is received. The contents are transmitted to the VMS 270 using the data. The VMS 270 stores the data transmitted from the IP-PBX1 210 in the voice mailbox (S520).

Thereafter, the extension client 220 that terminates the phone call may make a call to the VMS 270 using the extension phone 224 to check, modify, or delete the contents of the call stored in the voice mailbox. In addition, the extension client 220 may check the call contents stored in the voice mailbox of the VMS 270 by accessing the VMS 270 using the CTI computer 222.

6 is a flowchart illustrating a CTI service for switching a call in an extension terminal.

In step S510 of FIG. 5, when the extension client 220 attempts to set up a call forwarding CTI service for receiving a call to another phone when the user is absent, rather than storing a CTI service to be provided. The extension client 220 sets the call forwarding CTI service by inputting the extension number of the incoming call when the user is absent using the key input unit 430.

If the CTI computer 222 selects the call forwarding CTI service function to the key input unit 430 and its associated data is input, the terminal information stored in the terminal information storage unit 440, for example, an IP address and an extension number. On the basis of (eg, 100), call forwarding CTI service request data is generated to be forwarded to the target extension number and is transmitted to the IP-PBX1 210 to which the extension telephone 224 is connected (S602).

In the IP-PBX1 210 which has received the call forwarding CTI service request data from the CTI computer 222, the CTI processing unit 320 receives the call request received at the connection port to which the extension telephone 224 is connected. The alternative call path of the extension telephone 224 is set so that the terminal of the target extension number is transmitted to the connected connection port (S604).

Then, the extension client 220, a user of the extension phone 224, when leaving the seat and going on a business trip, by clicking the "CTI service" button in the CTI program of the CTI computer 222, The call forwarding function is executed from the point of travel.

When the " CTI Service " button is clicked in the CTI program of the CTI computer 222 by the extension client 220 (S606), the CPU 470 generates control data to start the CTI service and the extension phone 224. ) Is transmitted to the connected IP-PBX1 210 (S608). The IP-PBX1 210 activates an alternate call path of the extension telephone 224 to be delivered to the destination extension number set for the call request received by the extension telephone 224.

As described above, when a call request is received by the extension telephone 224 while the call forwarding CTI service function is set in the extension telephone 224 (S610), the IP-PBX1 210 receives the received call request. The extension phone 224 transmits to the extension target extension number which is an alternative call path (S612). Therefore, a normal telephone call is made between the person who calls the extension telephone 224 and the user of the call destination terminal (S614).

According to the above embodiment, IP-PBX1 210 for providing CTI service is provided, and a plurality of extension telephones are connected thereto, and the CTI computer and the extension telephone in which the CTI program is installed are used together. As a result, a CTI service having various functions can be realized by using a general extension telephone.

It will be understood by those skilled in the art that the present invention is not limited to the above embodiments and can be variously modified and changed without departing from the technical gist of the present invention.

As described above, according to the present invention, it is not necessary to install expensive terminals capable of CTI services by applying CTI services to extension terminals used in the premises using IP-PBX and computers, thereby greatly reducing system installation costs. It has an effect.

In addition, by using the CTI services such as a call forwarding function, a voice mail function, and a number guide function using an extension terminal, it is possible to increase work efficiency.

Claims (14)

By using Internet Protocol-Private Branch Exchange (IP-PBX) with Internet telephony, it provides Voice Mail Service (VMS) function and CTI (Computer Telephony Integration) service of call forwarding function to client for extension. In the method for providing a CTI service to an extension terminal using an IP-PBX, (a) installing a CTI program for a client capable of setting the CTI service on the extension client, (b) executing the client CTI program installed in the extension client; (c) setting a CTI service to be provided to the extension client; (d) receiving a telephone call request to the extension client, and (e) executing the configured CTI service; CTI service method of an extension terminal using an IP-PBX, characterized in that it comprises a. The method of claim 1, The extension client provides a CTI service to an extension terminal using an IP-PBX, characterized in that the one computer with the client CTI program is installed and one extension telephone connected to the IP-PBX. . The method of claim 1, In step (b), the client CTI program records, stores, rehearses, and deletes the contents of a call, switches to another phone when not in use, sets a missed announcement message, and uses an integrated telephone. Method of providing a CTI service to an extension terminal using the IP-PBX, characterized in that it comprises a function for setting. The method of claim 1, In the step (c) or (e), the CTI service provides a function of storing a call made by the extension client or a call forwarding function of converting a call request received by the extension client to another terminal. A method for providing a CTI service to an extension terminal using an IP-PBX, characterized in that. The method of claim 1, If the CTI service is a service providing a function of storing the telephone call, IP-PBX characterized in that it further comprises the step (e) and after (f) storing the execution contents of the CTI service To provide CTI services to an extension terminal. The method of claim 1, In step (c), the CTI service request data is generated on the basis of the extension telephone to be provided with the CTI service and the IP address of the IP-PBX to which the extension telephone is connected to the IP-PBX to which the extension telephone is connected. A method of providing a CTI service to an extension terminal using an IP-PBX, characterized in that transmitted or transmitted to an external system that provides a set CTI service. The method of claim 3, wherein The function of setting the extension telephone is set by inputting the IP (Internet Protocol) address of the IP-PBX to which the extension telephone is connected and the extension number of the extension telephone. How to provide CTI service to terminal. The method of claim 5, The step (f) uses the IP-PBX to transmit and store the contents of the call to a voice mailbox system (VMS) that provides a function of recording, storing, rehearing, and deleting the voice of the calling user. Method of providing CTI service to an extension terminal. By using the Internet Protocol-Private Branch Exchange (IP-PBX) with Internet telephony, a voice mail (VMS) function and a computer telephony integration (CTI) service with an auto attendant are provided to a number of extension terminals. In the system to provide CTI service to the terminal for extension using the provided IP-PBX, It is possible to transmit and receive not only analog voice information but also various digital data through the Internet, thereby providing a call function and a CTI service function between the extension terminal and another terminal connected to the Internet as well as a call between the plurality of extension terminals. IP-PBX (Internet Protocol Private Exchange), and A CTI computer connected to the Internet and integrated with one extension terminal and controlling the integrated extension terminal to receive the CTI service by executing a client CTI program. System for providing a CTI service to an extension terminal using an IP-PBX, characterized in that it comprises a. The method of claim 9, The IP-PBX includes a main control unit (SCM) for controlling, managing, and maintaining a device, a public switch module (PSM) for connecting an analog trunk line, and an extension matching unit for connecting an extension phone ( Subscriber Switch Module (SSM), Digital Signal Processing Unit (VSM) for VoIP Control, and processing data related to a call request or CTI service request applied to the Digital Signal Processing Unit on the Internet or through the extension matching unit. A system for providing a CTI service to an extension terminal using an IP-PBX, characterized in that it comprises a CTI processing unit for processing a call request. The method of claim 9, The CTI computer includes a network interface card (Network Interface Card) connected to the Internet for communication with a plurality of extension clients, and a CTI service so that an extension telephone that is integrated with the CTI computer can receive CTI services. The CTI program unit for the client, which stores a program for setting a program and related files, and a key for executing a client CTI program to select a function or input terminal information data of an extension telephone integrated with the CTI computer. An input unit, a terminal information storage unit for storing terminal information data of an extension telephone integrated with the CTI computer, and an extension telephone integrated with the CTI computer by executing a client CTI program to receive CTI services. The central processing unit (CPU) A system for providing a CTI service to an extension terminal using an IP-PBX, characterized in that it comprises a. The method of claim 10, When the CTI processing unit receives the CTI service request data from the CTI computer to the digital signal processing unit, the CTI processing unit transmits data for executing the set CTI service to the VMS and uses the integrated telephone connected to the extension telephone. A system for providing a CTI service to an extension terminal using an IP-PBX, characterized by transmitting data for executing a CTI service to a PBX. The method of claim 11, The program for setting the CTI service generates the CTI service request data based on the terminal information stored in the terminal information storage unit and transmits the CTI service request data to the VMS via the Internet. A system that provides CTI services. The method of claim 11, The terminal information stored in the terminal information storage unit is a system for providing a CTI service to an extension terminal using an IP-PBX, characterized in that the extension number of the terminal and the IP (Internet Protocol) address of the IP-PBX to which the terminal is connected. .