KR100272593B1 - Lan telephony system - Google Patents

Abstract

The LAN Telephony System is to provide a telephone service over a data network using an international standard protocol. A LAN telephony system includes a telephone network and a LAN telephony system having a data network. A gateway for converting different signaling systems of a data network, creating a channel in place of the external telephone, compressing and extending data, and transmitting the data; and a plurality of user systems for making calls by a plurality of users connected to the data network; It is composed of a call server that collectively controls the system in accordance with international standard protocols such as adjusting the service quality by measuring the user information management and the congestion of the data network.

Description

Lan phone system

The present invention relates to a LAN Telephony System, and more particularly to a LAN Telephony System for providing a telephone service using a data network.

Hereinafter, a telephone-computer integrated system and an internet phone according to the prior art will be described with reference to the accompanying drawings.

1 is a diagram showing the configuration of a general computer-telephone integration system (hereinafter, abbreviated as CTI), which includes a telephone network 1, a call center 2, an exchange 3, and a data network 4; ) And a customer management database 5.

FIG. 2 is a diagram illustrating a connection state of a general Internet phone, and a data packet between first and second computers 11 and 12 having a microphone and a speaker, and the first and second computers 11 and 12. It consists of a packet network 13, such as a LAN and the Internet, for transmitting the data.

The telephone-computer integrated system and Internet phone according to the prior art configured as described above will be described in detail with reference to the accompanying drawings.

First, in the general CTI service as shown in FIG. 1, when a customer 1 makes a call, a telephone signal is transmitted to the call center 2 through the telephone network 1.

The goal center 2 then identifies the customer 1 who made the call in accordance with the transmitted telephone signal, extracts data from its own customer management database 5 via the data network 4 and provides a corresponding service. .

In addition, the customer 1 may access the switchboard 3 through the telephone network 1 and then directly access the customer management database 5 through the data network 4 to receive a desired service.

Meanwhile, in the Internet phone system as shown in FIG. 2, a user who wants to be provided with a service through a packet network such as a LAN or the Internet may use an application for using the Internet phone in the first computer 11. After running, dial the IP address of the other party.

The first computer 11 then converts the call request signal of the counterpart IP address according to the IP protocol and transmits the corresponding data packet to the packet network 13.

Accordingly, the second computer 12 receives and retrieves a data packet through the packet network 13 and notifies the user that the call has been received according to the call request signal.

By doing so, data communication between the first and second users using the first and second computers 12 connected to the packet network 130 is performed.

However, in the conventional computer-telephone integration (CTI) system according to the prior art, it is not a true integration of the computer and the telephone network because the user calls through the telephone network and views the user information through the terminal connected to the data network.

In other words, users of the data network still have a problem of receiving services through different interfaces, such as a telephone network and a data network.

In addition, in a conventional Internet phone according to the prior art, it is rare to provide a function that interworks with a telephone network, and all users must be connected to the Internet, that is, a data network. There are also incompatibilities.

This is a very big constraint for users and one of the reasons why Internet phones are not very popular.

Accordingly, an object of the present invention is to provide a LAN telephony system for providing a telephone service through a data network using an international standard protocol.

1 is a view showing the configuration of a general telephone-computer integration service

2 is a view showing a connection state of a typical Internet phone

3 is a block diagram illustrating a LAN telephony system according to the present invention.

4 is a diagram illustrating a system connection state of FIG. 3.

5 is a diagram showing the detailed configuration of the user system of FIG.

6 is a diagram showing the detailed configuration of the call server of FIG.

7 is a flowchart illustrating a process of initial registration by a user system supporting a LAN telephone in a LAN telephony system according to the present invention.

8 is a flowchart illustrating a process in which a first user connected to a data network makes a phone call to a second user connected to a telephone network in a LAN telephony system according to the present invention.

FIG. 9 is a flowchart illustrating a process in which first to third users connected to a data network make a multi call in a LAN telephony system according to the present invention.

FIG. 10 is a flowchart illustrating a process of providing a voice mail service as an additional service when a first user connected to a telephone network makes a call to a second user connected to a data network in a LAN telephony system according to the present invention.

Explanation of symbols for main parts of the drawings

110: multiple external telephones 120: telephone network

130: data network 140: gateway

150: multiple user systems

150a: system control signal user interface

150b: voice media data control signal module

150c: first system control signal processing interface unit

150d: user registration and call setup control signal module

150e: Hardware Voice I / O Module

150f: voice data processor 150f-1: voice data compressor

150f-2: transmit buffer control unit 150f-3: receive buffer control unit

150f-4: Voice Data Restoration and Mixing Unit

150g: data transmission protocol

160: call server

160a: second system control signal processing interface unit

160b: address translation module 160c: user address management table

160d: user registration and authentication control module

160e: User Registration Management Database

160f: network resource management unit 160g: network monitoring module

160h: user management database 160i: call signal routing module

160j: Media Control Processing Module 160k: Multiple Call Management

160l: additional service routing module 170: multiple routers or hubs

180: additional service server 190: first LAN network interface unit

200: second LAN network interface unit

A feature of the LAN Telephony System according to the present invention for achieving the above object is that in the LAN Telephony System having a telephone network and a data network, the telephone network and the data network are mutually different. A gateway for converting other signaling systems, creating a channel on behalf of the external telephone, compressing and extending data, and transmitting the data; a plurality of user systems for making calls by a plurality of users connected to the data network; and the user information. It comprises a call server that collectively controls the system in accordance with international standard protocols, such as management and adjusting the quality of service by measuring the congestion of the data network.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is to use the H.323 protocol as the international standard protocol.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is, the user system outputs a control signal for conveniently providing a control-related interface, such as making / receiving calls to the user A system control signal user interface unit configured to generate and adjust a voice media data channel using a system control signal protocol, and a system control signal interface to process the system control signal. A first system control signal processing interface unit for transmitting and receiving a system control signal to and from the call server, a user registration and call setting control signal module for setting or changing a call, and a microphone (not shown) Capture the voice or send the restored voice to the user through the speaker (not shown). A hardware voice input / output module that plays a sound, a voice data processor that compresses or decompresses voice data according to a signal of the voice media data control signal module, and a data transmission protocol that transmits the voice data compressed by the voice data processor according to a transmission protocol. It consists of including wealth.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is H.245 as a system control signal protocol used in the voice media data control signal module. It is to use.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is a system control signal (system control signal) used in the user registration and call setup control signal module H.225 To use the signal.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is, the call server analyzes the signal received through the second LAN network interface unit system control signal protocol (system control signal protocol) a second system control signal processing interface unit for interfacing to each module or transmitting signals generated by the modules to a target system according to a signal protocol), a telephone number of the user output from the second system control signal processing interface unit, and An address conversion module for converting into an IP address recognizable by a data network, a user address management table for managing user telephone numbers and IP addresses converted by the address conversion module, and output from the second system control signal processing interface unit; To control user registration and authentication based on a registered phone number A resource of the data network according to a signal output from the registration and authentication control module, a user registration management database storing and managing information of a user registered by the user registration and authentication control module, and the second system control signal processing interface unit; A network management module for managing a network, a network monitoring module for monitoring the data network according to signals of the user registration and authentication control module and a network resource management unit, and a user management database for managing user information for monitoring in the network monitoring module; And a call signal routing module for transmitting and receiving a plurality of user system and system control signals according to the signal output from the second system control signal processing interface unit to control setting and change of a call. 2 system A media control processing module for transmitting control messages related to transmission and reception of media channels, such as voice data, of the system control signal to users participating in the same call according to the signal output from the fish signal processing interface unit; Multi-call management for managing multiple calls according to signals from the signal routing module and the media control processing module, and linking the current call to an additional service server providing various additional services according to signals output from the second system control signal processing interface unit. The additional service routing module is configured to include.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is a system control signal protocol (system control signal protocol) used in the second system control signal processing interface unit H .323 is used.

Another feature of the LAN Telephony System according to the present invention for achieving the above object, the step of notifying the user of the location and telephone number to the call server at the time of booting, according to the information of the user The call server performs an authentication process, if the user is a user who can receive the service, stores the information in an internal database and maintains a standby state for receiving a call after notifying the user that the user has been successfully registered. If the user cannot receive the service as a result of the authentication, the call server consists of informing the user that the user cannot receive the service.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is, after the first user connected to the data network launches the application system to enter the phone number of the second user connected to the telephone network The first user system requests the call server for an IP address corresponding to the telephone number of the second user, and according to the IP address request, the call server searches the user address management table to obtain the telephone number of the second user. Transmitting an IP address of the gateway after determining that it is connected to an external telephone network; and if the first user requests a call connection with the second user according to the transmitted IP address, the call server transmits a connection request signal to the gateway. And whether the gateway can provide an external telephone service according to the transmitted connection request signal. Converting the connection request signal into a general telephone network signal and making a call to the second user, if the second user receives the call, the gateway connects to the first user through a call server. After receiving the notification that the call server and the voice media data control signal is transmitted and received the media channel for transmitting the voice data, the second user system restores the voice data transmitted through the assigned media channel to the speaker Playback of the first user's voice, compressing the data of the first user, and transmitting the data through a media channel; converting the voice data of the first user transmitted through the media channel into an analog signal at the gateway and 2 to the user and the voice data of the second user Converting the signal to a second user through a media channel and making a call; and when the first user decides to hang up after the call, the first user system ends the call to the second user system through the call server and the gateway. After transmitting the call, the call is terminated and the gateway disconnects the call with the second user and returns the media channel allocated for the call.

Another feature of the LAN Telephony System according to the present invention for achieving the above object is that, after the first user connected to the data network launches the application system, the phone number of the second user connected to the data network Inputting, the first user system requests the call server for an IP address corresponding to the telephone number of the second user, and according to the IP address request, the call server searches the user address management table to search for the IP address of the second user. Transmitting a call, requesting a call connection with a second user by a first user according to the transmitted IP address, and according to the requested call connection request signal, a call server is currently registered with the second user. Transmitting the call connection request signal of the first user to the second user, if it is registered by searching whether there is a registration; In response to the call connection request signal, the second user system searching whether the second user can receive a call; and if the second user does not answer the call as a result of the search, the second user system connects the call through the call server. Sending a signal to reject the request to the first user system to inform the first user that the call is not answered, and when the second user receives the call as a result of the search, the gateway connects to the first user through a call server. Receiving a voice channel data control signal through a call server and then allocating a media channel for voice data transmission; and restoring the voice data transmitted through the allocated media channel in the second user system. Play back and record and compress the first user's voice Transmitting a call through a media channel, and entering a phone number of a third user to perform a multi-call by the first user and performing the same process as described above. Recognizing that the user should enter the system and allocating resources to support the same, the multi-call management module in the assigned call server informs the first to third users that the multi-call has the control right and then uses the system control signal. Establishing a new voice data channel, multicasting first to third users through a newly set voice data channel, and performing a multi-call through the multi-call; And the first user system drops the control channel with the multiple call management module in the call server, Returning the resources used for the call, and in response to the first user's withdrawal, the multi-call management module in the call server notifies the second and the third user of the second and third user systems. Making a call between the second and third users after ending the data processing; and if the second user wants to hang up after the call, the second user system controls the control channel with the multi-call management module in the call server. Disconnecting and returning the resources used for the call, and when the second call management module in the call server notifies the third user according to the withdrawal of the second user, the third user system is configured to process data with the second user. Terminating the call in the multi-call management module in the call server according to the step of terminating the portion and ending the portion for data processing with the second user. When reporting to the call server, the call server consists of returning the resources allocated for the multiple calls.

Another feature of the LAN telephony system according to the present invention for achieving the above object is that the first user system when the first user connected to the telephone network inputs the telephone number of the second user connected to the data network. Transmitting a signal corresponding to the telephone number to a gateway through a telephone network; and when the gateway requests a location of a second user corresponding to the telephone number from a gateway to a call server according to the transmitted signal, the call server manages a user address. Transmitting a location of a second user to the first user system with reference to a table; and if a gateway requests a call connection with a second user according to the transmitted location of the second user, the call server requests the second user. Searching whether the server is currently registered, and if the search result is registered, the call server sends a message to the second user. Transmitting a call connection request signal from a tway; according to the transmitted call connection request signal, the second user system searches whether a second user can answer a call; and receives the search result call. If possible, the second user system notifies the second user of the call connection request, then searches for a call and connects the call if the call is answered; and if the call cannot be received or the call is not received, the second user system is called the call server. Transmitting a system control signal not to answer a call to the telephone; and, according to the transmitted system control signal, a call server transmitting a call connection request signal from the gateway to a voice mailbox servo which is an additional service server; And voice mailbox server use the system control signal to store the voice data to leave in the mailbox. Generating a media channel to be transmitted; when the voice mailbox server transmits the stored message to the gateway through the generated media channel, the gateway converts the stored message into a telephone signal and transmits the converted message to the first user; The first user may leave a message according to the message of the voice mailbox server, and the gateway may transmit the message of the first user to the voice mailbox server through a media channel and store the message.

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

3 is a block diagram illustrating a LAN telephony system according to the present invention, a plurality of external telephones 110, a telephone network 120 capable of telephone service, and a data network 130 for transmitting and receiving data; After converting the different signaling systems of the telephone network 120 and the data network 130 according to the international standard protocol, and creating a channel in the data network 130 in place of the plurality of external telephones 110 and then the data A gateway 140 for transmitting and receiving, a plurality of user systems 150 for making a call by a plurality of users connected to the data network 130, and a system control signal for making a call with the plurality of user systems 150. a call server 160 for transmitting and receiving a control signal, a plurality of routers or hubs 170 for switching signals received from the data network 130 to respective destinations, and additional services such as fax and auto answer Ha It consists of a supplementary service server 180.

4 is a diagram illustrating a system connection state of FIG. 3, in which a plurality of external telephones 110 and different signaling systems are converted and channels are created on behalf of the plurality of external telephones 110. Call server 160 for exchanging a system 140 with a gateway 140, a plurality of user systems 150 for making a plurality of users calls, and a system control signal for a call with the plurality of user systems 150. It is composed of

FIG. 5 is a diagram illustrating a detailed configuration of the call server of FIG. 3, in which signals received through the second LAN network interface unit 200 are analyzed to interface to each module or transmit signals generated by the modules to a target system. The second system control signal processing interface unit 160a and the user's telephone number output from the second system control signal processing interface unit 160a and an address for converting into an IP address recognizable by the data network 130. A conversion module 160b, a user address management table 160c for managing the user's telephone number and IP address converted by the address conversion module 160b, and an output from the second system control signal processing interface unit 160a. User registration and authentication control module (160d) for controlling user registration and authentication according to the phone number, and registration in the user registration and authentication control module (160d) A network resource manager 160f for managing resources of the data network 130 according to a signal output from the user registration management database 160e for storing and managing user information and the signal output from the second system control signal processing interface 160a. ), A network monitoring module 160g for monitoring the data network 130 according to signals of the user registration and authentication control module 160d and the network resource management unit 160f, and the network monitoring module 160g. A plurality of user systems 150 and a system control signal according to a signal output from the user management database 160h and the second system control signal processing interface unit 160a for managing user information. A call signal routing module 160i for transmitting and receiving a call to control setting and change of a call, and the second system control signal processing interface; A media control processing module 160j for transmitting control messages related to transmission and reception of media channels, such as voice data, among the system control signals to users participating in the same call according to the signal output from the es 160 (a); And a signal output from the second system control signal processing interface unit 160a for managing multiple calls according to the signals of the call signal routing module 160i and the media control processing module 160j, and the second system control signal processing interface unit 160a. Is configured as an additional service routing module (160l) for linking the current call to the additional service server 180 for providing various additional services.

FIG. 6 is a diagram illustrating a detailed configuration of the user system of FIG. 3. The system control signal user interface unit 150a provides a control-related interface such as making / receiving a call to a user, and a system control signal. Voice media data control signal module 150b for establishing a data channel and adjusting a voice data channel using a protocol; and a first system control signal processing interface 150c for processing and interfacing the system control signal. And a user registration and call setting control signal module 150d for transmitting or receiving a system control signal with the call server 160 and setting or changing a call, and a microphone (not shown). A hardware voice input / output module 150e for transmitting the captured or restored voice to a user through a speaker (not shown); A voice data processor 150f for compressing or restoring voice data according to a signal of the media data control signal module 150b, and a first LAN network interface unit for the voice data compressed by the voice data processor 150f according to a transmission protocol. It consists of a data transmission protocol unit 150g to transmit to (190).

The voice data processor 150f buffers the voice data of the user and transmits the compressed data through a media channel, and buffers the voice data compressed by the voice data compressor 150f-1. A transmission buffer control unit 150f-2 for controlling transmission, a reception buffer control unit 150f-3 for receiving and controlling voice data transmitted from the data transmission protocol unit 150g, and the voice media data control signal module ( And a voice data recovery and mixing unit 150-4 for receiving, restoring, and mixing the voice data through the media channel according to the voice media data control signal of 150b).

The operation of the LAN telephony system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, a plurality of user systems connected to the data network 130 transmit their locations and telephone numbers to the call server 160 when each user boots up.

The call server 160 then performs an authentication process according to the location and phone number respectively transmitted from the plurality of user systems.

That is, the second system control signal processing interface 160a in the call server 160 transmits a system control signal for performing a user registration and authentication process according to the transmitted location and phone number.

Then, the address conversion module 160b converts the addresses of each of the plurality of user systems according to a system control signal transmitted from the second system control signal processing interface unit 160a to convert the user address management table 160c. ).

In addition, the user registration and authentication control module 160d registers each of the plurality of user systems in the user registration management database 160e according to the system control signal transmitted from the second system control signal processing interface 160a.

In addition, the user registration and authentication control module 160d transmits each of the plurality of user systems through a network monitoring module 160g according to a system control signal transmitted from the second system control signal processing interface 160a. 160h).

In this state, a second user using the second user system 150-2 connected to the data network 130 uses the first external telephone 110-1 connected to the telephone network 120. After launching an application system to make a call with a user and inputting the telephone number of the first user, the second user system 150-2 sends an IP address corresponding to the telephone number of the first user to the call server 160. request.

That is, the user registration and call setup control signal module 150d in the second user system 150-2 transmits a signal for requesting an IP address corresponding to a telephone number input from the system control signal user interface unit 150a. do.

Then, the first system control signal processing interface unit 150c interfaces the signal transmitted from the user registration and call setup control signal module 150d to the first LAN network interface unit 190.

Accordingly, the call server 160 converts the first user's telephone number according to the first user's IP address request, searches for the first user's telephone number, and recognizes that the first user's telephone number is an external telephone. Is transmitted to the second user system 150-2.

That is, the second system control signal processing interface unit 160a in the call server 160 transmits a system control signal according to a signal transmitted from the second user system 150-2. Interface to each module according to control signal protocol).

The system control signal protocol used in the second system control signal processing interface unit 160a is H.323.

Then, the address conversion module 160b converts the telephone number input from the second user system 150-2 interfaced from the second system control signal processing interface unit 160a and then refers to the user address management table 160b. By determining that the first user's telephone number is an external telephone, the IP address of the gateway 140 is transmitted.

Accordingly, the second user system 150-2 requests the call server 160 to connect with the first user according to the transmitted IP address of the gateway 140.

That is, the user registration and call setup control signal module 150d in the second user system 150-2 requests the call server 160 to connect with the first user according to the IP address of the transmitted gateway 140. do.

The system control signal used in the user registration and call setup control signal module 150d is an H.225 signal.

Then, the call server 160 connects with the gateway 140 according to the call connection request signal of the second user system 150-2 and transmits a call connection request signal of the second user.

That is, the call signal routing module 160i in the call server 160 transmits the call connection request signal of the second user by connecting to the gateway 140 according to the call connection request signal of the second user system 150-2. do.

Accordingly, the gateway 140 searches whether the gateway 140 can provide an external telephone service according to the call connection request signal of the second user system 150-2.

If the search result cannot provide an external telephone service, the gateway 140 transmits a signal to the call server 160 to reject the call connection request signal of the second user.

The call server 160 then rejects the call connection request signal of the second user.

That is, the call signal routing module 160i in the call server 160 transmits a signal for rejecting the call connection request signal of the second user to the second user system 150-2.

Accordingly, the second user system 150-2 notifies the second user that the state of the first external telephone of the first user is busy according to the signal transmitted from the call server 160.

If the search result can provide an external telephone service, the gateway 140 converts the connection request signal of the second user into a general telephone network signal and calls the first user.

In addition, the gateway 140 transmits a signal indicating that the call is connected with the first user to the call server 160.

Then, the call server 160 receives the signal transmitted from the gateway 140 through the second LAN network interface 200 to inform the second user that the call is being connected with the first user.

That is, the call signal routing module 160j in the call server 160 receives the signal transmitted from the gateway 140 through the second LAN network interface 200 and the second system control signal processing interface 160a. To transmit a signal for notifying that the second user is in a call connection with the first user.

Accordingly, the second user system 150-2 transmits a call connection tone to the second user through a speaker according to the signal transmitted from the call server 160.

That is, the system control signal user interface unit 150a in the second user system 150-2 transmits the signal transmitted from the call server 160 to the first LAN network interface unit 190 and the first system control signal processing interface unit. Received through the user 150c and the user registration and call setup control signal module 150d, the call connection tone is transmitted to the second user through the speaker.

Thereafter, when the first user receives the first external call, the gateway 140 transmits a signal to the call server 160 indicating that the first user has received the call.

Then, the call server 160 transmits the signal transmitted from the gateway 140 to the second user system 150-2 through the second LAN network interface unit 200, indicating that the first user has received a call. .

That is, the call signal routing module 160i in the call server 160 transmits the signal transmitted from the gateway 140 through the second LAN network interface unit 200 and the second system control signal processing interface unit 160a. The user system 150-2 transmits a signal indicating that the first user has answered the call.

Subsequently, the second user system 150-2 receives the signal transmitted from the call server 160 through the first LAN network interface 190 to notify the second user that the first user has received a call.

That is, the system control signal user interface unit 150a in the second user system 150-2 transmits the signal transmitted from the call server 160 to the first LAN network interface unit 190 and the first system control signal processing interface unit. 150c and received through the user registration and call setup control signal module 150d to inform the second user that the first user has answered the call.

Accordingly, the second user system 150-2 and the gateway 140 exchange voice media data control signals through the call server 160 and allocate voice media channels for voice data transmission.

That is, the voice media data control signal module 150b in the second user system 150-2 transmits a signal for allocating a channel for transmitting voice data to the first system control signal processing interface 150c and the first LAN network. Transmission through the interface unit 190.

Then, the media control processing module 160j in the call server 160 transmits the signal transmitted from the second user system 150-2 to the second LAN network interface unit 200 and the second system control signal interface unit 160a. Allocates a channel for receiving voice data and transmitting voice data.

Thereafter, the second user system 150-2 restores the voice data received through the assigned voice media channel, plays the audio data through the speaker, records the voice of the second user, compresses the voice data, and then decompresses the voice data channel. Send it through.

That is, the voice media data control signal module 150b in the second user system 150-2 controls the voice data processor 150f to process voice data received through the voice media channel allocated by the call server 160. Send a signal to control.

The system control signal protocol used in the voice media data control signal module 150b is H.245.

Then, the voice data processing unit 150f interfaces with the first LAN network interface unit 190 according to the control signal of the voice media data control signal module 150b and then converts the voice data protocol-converted from the data transmission protocol unit 150g. Restore and mix and send.

That is, the reception buffer control unit 150f-3 in the voice data processing unit 150f receives the voice data protocol-converted by the data transmission protocol 150g and buffers them according to the control signal of the voice media data control signal module 150b. After the transmission.

Then, the voice data recovery and mixing unit 150f-4 restores and mixes the voice data transmitted from the reception buffer control unit 150f-3 according to the control signal of the voice media data control signal module 150b.

The hardware voice input / output module 150e then transmits the voice data transmitted from the voice data processor 150f to the user through a speaker (not shown).

In addition, the hardware voice input / output module 150e converts a voice signal input from the second user through a microphone (not shown) into voice data corresponding thereto and transmits the voice signal.

Accordingly, the voice data processor 150f compresses the voice data transmitted from the hardware voice input / output module 150e and transmits the voice data through the voice media channel set according to the control signal of the voice media data control signal module 150b.

That is, the voice data compression unit 150f-1 in the voice data processing unit 150f compresses and transmits the voice data of the hardware voice input / output module 150e according to the control signal of the voice media data control signal module 150b.

Then, the transmission buffer controller 150f-2 buffers the voice data compressed by the voice data compression unit 150f-1, and then transmits the set voice media channel according to the control signal of the voice media data control signal module 150b. Send it through.

Accordingly, the data transmission protocol unit 150g converts the transmission protocol of the voice data compressed by the voice data processing unit 150f and transmits it through the first LAN network interface unit 190.

Then, the gateway 130 expands the voice data transmitted from the second user system 150-2 through the voice media channel, converts the voice data into a general telephone network signal, and converts the first external telephone 110-through the telephone network 120. 1) to the first user to use.

In this way, a call service between users using a LAN and users using a telephone network 120 is possible.

Thereafter, when the second user intends to hang up the call, the second user system 150-2 ends the call to the first external telephone 110-1 of the first user through the call server 160 and the gateway 140. After sending, exit the application system.

That is, the user registration and call setting control signal module 150d in the second user system 150-2 may output a control signal for ending the call according to the termination of the call of the second user by the first system control signal interface unit 150c. And after transmitting through the first LAN network interface 190, the application system is terminated.

The call server 160 then transmits the call termination signal transmitted from the second user system 150-2 to the gateway 140.

Accordingly, when the gateway 140 disconnects the call with the second user and returns the voice media channel allocated for the call, the call server 160 terminates the call.

Meanwhile, after the first user using the first user system 150-1 connected to the data network 130 floats an application system to make a call with the second user connected to the data network 130, the first user 2 When the user's telephone number is input, the first user system 150-1 requests the call server 160 for an IP address corresponding to the third user's telephone number.

That is, the user registration and call setup control signal module 150d in the first user system 150-1 transmits a signal for requesting an IP address corresponding to a telephone number input from the system control signal user interface unit 150a. do.

Then, the first system control signal processing interface unit 150c interfaces the signal transmitted from the user registration and call setup control signal module 150d to the first LAN network interface unit 190.

Accordingly, the call server 160 converts the telephone number of the second user according to the request of the IP address of the second user, searches for the second user, and transmits the IP address of the first user to the first user system 150-1.

That is, the second system control signal processing interface unit 160a in the call server 160 may transmit a system control signal according to a signal transmitted from the first user system 150-1. Interface to each module according to control signal protocol).

The system control signal protocol used in the second system control signal processing interface unit 160a is H.323.

Then, the address conversion module 160b converts the telephone number input from the first user system 150-1 interfaced from the second system control signal processing interface unit 160a and then refers to the user address management table 160b. To transmit the IP address of the second user.

Accordingly, the first user system 150-1 requests the call server 160 to connect with the second user according to the transmitted IP address of the second user.

That is, the user registration and call setup control signal module 150d in the first user system 150-1 requests the call server 160 to connect with the second user according to the transmitted IP address of the second user. do.

The call server 160 then searches whether the second user is currently registered according to the call connection request signal of the first user system 150-1.

That is, the user registration and authentication control module 160d in the call server 160 refers to the user registration management database 160e according to the call connection request signal of the first user system 150-1 if the search result is registered. Search whether the third user is currently registered.

If the search result is registered, the call server 160 transmits a connection request signal of the second user to the third user.

That is, the call signal routing module 160j in the call server 160 transmits the connection request signal of the first user to the second user.

Thereafter, the call server 160 transmits a call connection request signal to the second user system 150-2 by searching whether the second user can answer the call and receiving the call.

Subsequently, the second user system 150-2 searches whether the second user answers the call and transmits a signal to the call server 160 to reject the call connection request signal of the first user if the second user does not answer the call.

Then, the call server 160 receives the call connection rejection signal of the second user system 150-2 through the second LAN network interface unit 200 and informs of the control signal for the first user system 150-. To 1).

That is, the call signal routing module 160i in the call server 160 transmits the call connection rejection signal of the second user system 150-2 to the second LAN network interface unit 200 and the second system control signal processing interface unit. The control signal received through the 160a and notified of this is transmitted to the first user system 150-1.

Accordingly, the first user system 150-1 terminates the call connection after notifying the first user that the second user does not answer the call according to the control signal transmitted from the call server 160.

If the second user receives the call as a result of the search, the second user system 150-2 transmits a signal for notifying the call.

That is, the user registration and call setup control signal module 150d in the second user system 150-2 may signal a signal indicating that the second user has received a call from the system control signal user interface unit 150a. Is transmitted through the first system control signal processing interface unit 150c and the first LAN network interface unit 190.

Then, the call server 160 receives the signal transmitted from the second user system 150-2 through the second LAN network interface unit 200 and connects a call to the first user system 150-1. Send a signal to indicate that

That is, the call signal routing module 160i in the call server 160 transmits the signal transmitted from the second user system 150-2 to the second LAN network interface unit 200 and the second system control signal processing interface unit ( And a signal for notifying that the call is connected to the first user system 150-1.

Accordingly, the first user system 150-1 notifies the first user that the call is connected according to the signal transmitted from the call server 160.

Then, the first and second user systems 150-1 and 150-2 receive voice media data control signals through the call server 160 and receive voice media channels for transmitting voice data.

That is, the voice media data control signal module 150b in the first user system 150-1 transmits a voice media data control signal for exchanging voice data with the second user system 150-2.

Then, the call server 160 receives the voice media data control signal transmitted from the first user system 150-1 through the second LAN network interface unit 200 to communicate with the first user system 150-1. Allocate a voice media channel for exchanging voice data between the second user systems 150-2.

That is, the lure control processing module 160j in the call server 160 processes the voice media data control signal transmitted from the first user system 150-1 to process the second LAN network interface unit 200 and the second system control signal. The voice media channel is allocated through the interface unit 160a to exchange voice data between the first user system 150-1 and the second user system 150-2.

Subsequently, the first user system 150-1 restores the voice data received through the voice media channel allocated by the call server 160 and transmits the voice data through the speaker.

In other words, the voice media data control signal module 150b in the first user system 150-1 controls the voice data processor 150f to process voice data received through the voice media channel allocated by the call server 160. Send a signal to control.

Then, the voice data processing unit 150f interfaces with the first LAN network interface unit 190 according to the control signal of the voice media data control signal module 150b and then converts the voice data protocol-converted from the data transmission protocol unit 150g. Restore and mix and send.

That is, the reception buffer control unit 150f-3 in the voice data processing unit 150f receives the voice data protocol-converted by the data transmission protocol 150g and buffers them according to the control signal of the voice media data control signal module 150b. After the transmission.

Then, the voice data recovery and mixing unit 150f-4 restores and mixes the voice data transmitted from the reception buffer control unit 150f-3 according to the control signal of the voice media data control signal module 150b.

The hardware voice input / output module 150e then transmits the voice data transmitted from the voice data processor 150f to the user through a speaker (not shown).

In addition, the hardware voice input / output module 150e converts a voice signal input from the second user through a microphone (not shown) into voice data corresponding thereto and transmits the voice signal.

Accordingly, the voice data processor 150f compresses the voice data transmitted from the hardware voice input / output module 150e and transmits the voice data through the voice media channel set according to the control signal of the voice media data control signal module 150b.

That is, the voice data compression unit 150f-1 in the voice data processing unit 150f compresses and transmits the voice data of the hardware voice input / output module 150e according to the control signal of the voice media data control signal module 150b.

Then, the transmission buffer controller 150f-2 buffers the voice data compressed by the voice data compression unit 150f-1, and then transmits the set voice media channel according to the control signal of the voice media data control signal module 150b. Send it through.

Accordingly, the data transmission protocol unit 150g converts the transmission protocol of the voice data compressed by the voice data processing unit 150f and transmits it through the first LAN network interface unit 190.

Then, the second user system 150-2 restores the voice data transmitted from the first user system 150-1 through the voice media channel through the same procedure and sends the voice data through the speaker or inputs through the microphone. After the voice data of the third user is compressed, the transmission protocol is converted and transmitted.

In this way, a call service between users using a LAN is enabled.

In this state, when the first user and the second user invite the third user connected to the data network 130 to make a multi-call, the first user inputs the phone number of the third user. When the IP address of the third user is determined and the call between the first to third users is connected, the call server 160 recognizes that they make a multi-call and allocates resources to support the call.

That is, the media control processing module 160j in the call server 160 allocates IP multicasting to support the call when the call between the first to third users is connected, and informs the multi call manager 160k of the call. .

Then, the multi-call manager 160k informs the first to third user systems 150-1 to 150-3 that the multi-call is in control according to the signal of the media control processing module 160j.

Thereafter, the call server 160 and the first to third user systems 150-1 to 150-3 exchange system control signals and newly set up a voice data channel.

Here, the voice data channel preset between the first and second user systems 150-1 and 150-2 may be used as the voice data channel of the multi-call.

That is, the multi call manager 160k in the call server 160 exchanges a system control signal with the first to third user systems 150-1 to 150-3 and newly establishes a voice data channel. .

Then, the first to third user systems 150-1 to 150-3 exchange voice data through the set voice data channel.

In this way, the first to third user systems 150-1 to 150-3 connected to the data network 130 make multiple calls.

Thereafter, when the first user hangs up, the second user system 150-2 disconnects the control channel with the call server 160 and returns the resources used for the call.

That is, the first system control signal processing interface unit 150c in the first user system 150-1 disconnects the control channel from the multiple call manager 160k in the call server 160 and returns resources used for the call.

The call server 160 then notifies the second and third user systems 150-2 and 150-3 of the withdrawal of the first user through the second LAN network interface 200.

That is, the media control processing module 160l in the call server 160 transmits a signal for notifying the withdrawal of the first user through the second system control signal processing interface 160a and the second LAN network interface 200. Transmit to the second and third user systems 150-2 and 150-3.

Accordingly, the second and third user systems 150-2 and 150-3 make a phone call after ending the part of processing the voice data with the first user according to the signal of the call server 160.

That is, each of the voice media data control signal modules 150b in the second and third user systems 150-2 and 150-3 ends the processing of the voice data with the first user, and then the second and third user systems 150-2 and 150-3. The call is controlled between the third users.

Then, when the second user hangs up, the second user system 150-2 disconnects the control channel with the call server 160 and returns the resources used for the call.

That is, the first system control signal processing interface unit 150c in the second user system 150-2 disconnects the control channel from the multiple call manager 160k in the call server 160 and returns the resources used for the call.

The call server 160 then notifies the third user system 150-3 of the withdrawal of the second user through the second LAN network interface 200.

That is, the media control processing module 160l in the call server 160 transmits a signal for notifying the withdrawal of the second user through the second system control signal processing interface 160a and the second LAN network interface 200. Transmit to the third user system 150-3.

Accordingly, the third user system 150-3 makes a call after ending the portion of the voice data with the second user according to the signal of the call server 160.

In other words, the voice media data control signal module 150b in the third user system 150-3 ends the processing of the voice data with the second user.

In addition, the third user system 150-3 returns resources allocated by the call server 160 for multiple calls according to the withdrawal of the second user.

Accordingly, the call server 160 terminates the multiple call by disconnecting the voice media channel set up for the multiple call.

In addition, a first user using a first external phone 110-1 among a plurality of users using a plurality of external phones 110 calls a second user connected to the data network 130 through the telephone network 120. When the phone number of the second user is inputted to make a call, the gateway 140 requests the location of the second user corresponding to the phone number.

In response, the call server 160 converts the telephone number of the second user according to the request of the gateway 140, searches for the IP number, and transmits the IP address of the second user to the gateway 1540.

That is, the second system control signal processing interface unit 160a in the call server 160 transmits a system control signal to a system control signal protocol according to the signal transmitted from the gateway 140. Follow the interface to each module.

Then, the address conversion module 160b converts the telephone number input from the gateway 140 interfaced from the second system control signal processing interface unit 160a, and then refers to the second user by referring to the user address management table 160b. The IP address of the gateway 140 is transmitted to the gateway 140.

Accordingly, the gateway 140 requests the call server 160 to connect with the second user according to the transmitted IP address of the second user.

Then, the call server 160 searches whether the second user is currently registered according to the call connection request signal of the gateway 140.

That is, the user registration and authentication control module 160d in the call server 160 checks whether the second user is currently registered with reference to the user registration management database 160e if the search result is registered.

If the search result is registered, the call server 160 transmits a connection request signal of the first user to the second user.

That is, if the search result is registered, the call signal routing module 160i in the call server 160 transmits a request signal of the first user to the second user.

Thereafter, the call server 160 transmits a call connection request signal to the second user system 150-2 by searching whether the second user can answer the call and receiving the call.

Then, when the second user system 150-2 receives the call by searching whether the second user receives the call according to the call connection request signal, the second user system 150-2 performs the same process as above to set up the voice media channel, and then transmits and receives voice data. As a result, a call is made between a first user who uses the first external telephone 110-1 and a second user who uses the data network 130.

On the other hand, if the second user cannot answer the call or does not answer the call, the second user system 150-2 transmits a signal for rejecting the call connection request signal of the second user to the call server 160.

That is, the user registration and call setup control signal module 150d in the second user system 150-2 transmits a signal for rejecting the call connection request signal of the second user to the call server 160.

Then, the call server 160 transmits the requested signal to the additional service server 180 according to the call connection rejection signal of the third user system 150-3.

That is, the call signal routing module 160i in the call server 160 transmits the requested signal to the additional service routing module 160k according to the call connection rejection signal of the third user system 150-3.

The additional service routing module 160k then transmits the first user's information and the first user's information to the additional service server 180 to provide a voice message of the second user according to the transmitted signal.

Accordingly, the additional service server 180 and the gateway 140 start a new call while transmitting and receiving a system control signal through the call server 160.

In addition, the additional service server 180 and the gateway 140 transmit and receive a system control signal through the call server 160 to transmit voice data to be left in the additional service server 180. Create

Thereafter, the gateway 140 receives the message of the voice mailbox server 180 through a voice media channel, converts the message into a general telephone network signal, and transmits the message to the first user.

The first user then leaves a message at the request of the voice mailbox server 180.

Accordingly, the gateway 140 converts the message of the first user into a digital signal and transmits the message to the voice mailbox server 180 through the voice media channel.

Subsequently, the voice mailbox server 180 ends the call after storing the message of the first user transmitted from the gateway 140.

Hereinafter, in a LAN telephony system according to the present invention, first, a process of initial registration of a user system supporting a LAN telephone, and second, a first user connected to a data network makes a call to a second user connected to a telephone network. A process of making a call, third, a process in which the first to third users connected to the data network make a multi call, and fourth, a voice that is an additional service when the first user connected to the telephone network makes a call to a second user connected to the data network. The process of providing a mailbox service will be described in detail with reference to the accompanying drawings.

First, the initial registration process of the user system supporting the LAN phone is shown in FIG. 7, when the user informs the call server 160 of his location and phone number at boot time, the call server 160 calls the user. If the user is able to receive the service by performing the authentication process according to the information of the user, the information is stored in an internal database, and the user is notified that the user is successfully registered and maintains a standby state to receive a call.

The call server 160 notifies the user that the user cannot receive the service if the user cannot receive the service as a result of the authentication.

Second, the process of making a call by making a call to a second user connected to the data network by the first user connected to the data network is illustrated in FIG. 8, after the first user connected to the data network 130 launches an application system. When the telephone number of the second user connected to 120 is input, the first user system 150-1 requests the call server for an IP address corresponding to the telephone number of the second user.

Then, the call server 160 searches the user address management table according to the IP address request, determines that the telephone number of the second user is connected to the external telephone network, and then transmits the IP address of the gateway.

When the first user requests a call connection with the second user according to the transmitted IP address, the call server 160 transmits a connection request signal to the gateway.

Then, the gateway 140 searches whether the external telephone service can be provided according to the transmitted connection request signal, and if the external telephone service is provided, converts the connection request signal into a general telephone network signal and makes a call to the second user. .

That is, if the search result cannot provide the external telephone service, the gateway 140 transmits a signal to the call server 160 to reject the connection request of the first user.

Then, according to the connection request rejection signal, the call server 160 notifies the first user by transmitting a signal indicating that the second user does not answer or is busy on the first user system 150-1.

Thereafter, when the second user answers the call, the gateway 140 notifies that the first user is connected through the call server 160, and then exchanges voice media data control signals with the call server 160 to receive voice data. The media channel for transmission is allocated.

Then, the voice data transmitted through the assigned media channel is restored by the second user system 150-2 and reproduced through the speaker, the voice of the first user is recorded and compressed, and then the data is transmitted through the media channel.

The voice data of the first user transmitted through the media channel is converted into an analog signal by the gateway 140 and transmitted to the second user through the telephone network 120, and the voice data of the second user is converted into a digital signal to convert the media channel. The call is made to the second user via the call.

Thereafter, if the first user wants to hang up after the call, the first user system 150-1 transmits an end signal to the second user system 150-2 through the call server 160 and the gateway 140. Then the call is terminated and the gateway 140 disconnects the call with the second user and returns the media channel assigned for this call.

Third, the multi-call between the first to third users connected to the data network is performed by the first user connected to the data network 130 to the data network 130 after launching the application system. When the phone number of the connected second user is input, the first user system 150-1 requests the call server 160 for an IP address corresponding to the phone number of the second user.

In response to the IP address request, the call server 160 searches the user address management table and transmits the IP address of the second user so that the first user requests a call connection with the second user.

According to the requested call connection request signal, the call server 160 detects whether the second user is currently registered and transmits a call connection request signal of the first user to the second user if it is registered.

In addition, if the second user is not registered, the call server 160 enters the additional service module 160l.

Then, the second user system 150-2 searches whether the second user can receive a call according to the transmitted call connection request signal.

In addition, if the second user cannot receive the call, the call server 160 enters the additional service module 160l.

If the second user does not answer the search result, the second user system 150-2 transmits a signal to the first user system 150-1 to reject the call connection request through the call server 160. Inform the first user that he is not answering the call.

When the second user receives a call as a result of the search, the gateway 140 notifies that the first user is connected through the call server 160, and then exchanges a voice media data control signal through the call server 160. A media channel for voice data transmission is allocated.

The voice data transmitted through the assigned media channel is restored by the second user system 150-2 and played back through the speaker, the voice of the first user is recorded and compressed, and then the data is transmitted through the media channel to make a call. do.

When the call is connected by the first user inputting the phone number of the third user to make a multi-call and performing the above process, the call server 160 recognizes that it must enter the multi-call module and provides a resource to support the call. Assign.

The multi-call management module 160k in the assigned call server notifies the first to third users that the right to control the multi-call is owned, and then newly establishes a voice data channel (multicasting) using a system control signal.

Then, the first to third users transmit and receive voice information through the newly set voice data channel (multicasting) to make a multi-call.

If the first user wants to hang up after the multiple call, the first user system 150-1 disconnects the control channel with the multiple call management module in the call server 160 and returns the resources used for the call.

Subsequently, when the multiple call management module 160k in the call server 160 notifies the second and third users according to the withdrawal of the first user, the second and third user systems 150-2 and 150-3 are notified. After completing the portion for data processing with the first user, a call is made between the second and third users.

If the second user wants to hang up after the call, the second user system 150-2 disconnects the control channel with the multi-call management module in the call server and returns the resources used for the call.

Then, when the third user system 150-3 notifies the third user by the multi-call management module 160k in the call server 160 according to the withdrawal of the second user, the third user system 150-3 may process the data with the second user. To exit.

Upon completion of the part for data processing with the second user, when the call termination process is reported to the call server 160 by the multi-call management module in the call server, the call server 160 allocates the resources allocated for the multi-call. Returns.

Fourth, when the first user connected to the telephone network makes a call to the second user connected to the data network, the process of providing a voice mail service as an additional service is illustrated in FIG. 10. When the user inputs the telephone number of the second user connected to the data network 130, the first user system 150-1 transmits a signal corresponding to the telephone number to the gateway 140 through the telephone network 120. .

When the gateway 140 requests the call server 160 to locate the second user corresponding to the phone number according to the transmitted signal, the call server 160 refers to the user address management table 160c and the second user. Sends the location of the to the first user system 150-1.

When the gateway 140 requests a call connection with the second user according to the location of the second user, the call server 160 searches whether the second user is currently registered.

If the search result is registered, the call server 160 transmits a call connection request signal from the gateway 140 to the second user.

Then, according to the transmitted call connection request signal, the second user system 150-2 searches whether the second user can answer the call.

If it is possible to answer the call as a result of the search, the second user system 150-2 notifies the second user of the call connection request and then searches whether the call is received.

If the call cannot be answered or the call is not received, the second user system 150-2 transmits a system control signal not to answer the call to the call server 160.

Then, the call server 160 transmits a call connection request signal from the gateway 140 to the voice mailbox servo 180 which is an additional service server according to the transmitted system control signal.

Accordingly, the call server 160 and the voice mailbox server 180 generate a media channel for transmitting voice data to be left in the mailbox using a system control signal.

Then, when the voice mailbox server 180 transmits the stored message to the gateway 140 through the generated media channel, the gateway 140 converts the message into a telephone signal and transmits it to the first user.

According to the transmitted message, the first user leaves a message according to the message of the voice mailbox server.

Then, the gateway 140 transmits the message of the first user to the voice mailbox server 180 through the media channel and stores the message.

As described above, the LAN Telephony System according to the present invention supports interworking with a telephone network by providing a telephone service through a data network using an international standard protocol, and between systems developed by different developers. This has the effect of providing mutual compatibility.

Claims (12)

In a LAN telephony system having a telephone network and a data network, A gateway for converting different signaling systems between the telephone network and the data network, creating a channel in place of the external telephone, and then compressing and decompressing the data to transmit the channel; A plurality of user systems for making a call by a plurality of users connected to the data network; And a call server that collectively controls the system in accordance with international standard protocols such as adjusting the quality of service by measuring congestion of the user information and the data network. The method of claim 1, And a supplementary service server for providing supplementary services under the control of the call server. The method of claim 1, The user system A system control signal user interface for outputting a control signal for conveniently providing a control related interface such as making / receiving a call to a user; A voice media data control signal module for creating and adjusting a voice media data channel using a system control signal protocol; A first system control signal processing interface unit for processing and interfacing the system control signal; A user registration and call setting control signal module configured to send and receive a system control signal with the call server to establish or change a call; A hardware voice input / output module for capturing the user's voice with a microphone (not shown) or playing the restored voice to the user through a speaker (not shown); A voice data processor for compressing or restoring voice data according to a signal of the voice media data control signal module; And a data transmission protocol unit configured to transmit the voice data compressed by the voice data processor in accordance with a transmission protocol. The method of claim 3, wherein The voice data processing unit A voice data compression unit configured to compress the voice data of the user output from the hardware voice input / output module and transmit the compressed voice data through a media channel; A transmission buffer control unit for controlling transmission by buffering the speech data compressed by the voice data compression unit; A voice data recovery and mixing unit configured to receive, restore, and mix voice data through a media channel according to the voice media data control signal of the voice media data control signal module; And a reception buffer control unit configured to receive and control voice data transmitted from the data transmission protocol unit. The method of claim 1, The call server A second system control signal processing interface unit for analyzing a signal received through the second LAN network interface unit and interfacing to each module according to a system control signal protocol or transmitting signals generated by the modules to a target system Wow; An address conversion module for converting the user's telephone number output from the second system control signal processing interface unit into an IP address recognizable by the data network; A user address management table for managing the user phone number and IP address converted by the address conversion module; A user registration and authentication control module for controlling user registration and authentication according to the telephone number output from the second system control signal processing interface unit; A user registration management database configured to store and manage information of a user registered in the user registration and authentication control module; A network resource management unit managing resources of the data network according to a signal output from the second system control signal processing interface unit; A network monitoring module for monitoring the data network according to signals of the user registration and authentication control module and a network resource manager; A user management database managing user information for monitoring in the network monitoring module; A call signal routing module for transmitting and receiving a plurality of system control signals to and from the plurality of user systems according to signals output from the second system control signal processing interface unit to control setting and change of a call; A media control processing module for transmitting control messages related to transmission and reception of a media channel, such as voice data, of the system control signal to users participating in the same call according to the signal output from the second system control signal processing interface unit. and; Multiple call management for managing multiple calls according to signals of the call signal routing module and the media control processing module; And a supplementary service routing module for linking a current call to an supplementary service server for providing various supplementary services according to the signal output from the second system control signal processing interface unit (LAN Telephony System). . Notifying the call server of its location and telephone number at boot time; According to the information of the user, the call server performs an authentication process, and if the user can receive the service, the call server stores the information in an internal database and informs the user that the user has been registered successfully. Maintaining; If the user is unable to receive the authentication result service, the call server is LAN telephony system, characterized in that the step consisting of notifying the user that the service is not received. When the first user connected to the data network launches the application system and inputs the telephone number of the second user connected to the telephone network, the first user system requests the call server for an IP address corresponding to the second user's telephone number. ; In response to the IP address request, the call server searching the user address management table to determine that the telephone number of the second user is connected to an external telephone network, and then transmitting the gateway's IP address; When the first user requests a call connection with a second user according to the transmitted IP address, the call server transmitting a connection request signal to a gateway; In response to the transmitted connection request signal, if the gateway can provide an external telephone service by searching whether the external telephone service can be provided, converting the connection request signal into a general telephone network signal to make a call to a second user; When the second user answers the call, the gateway notifies that the first user is connected through a call server, exchanges a voice media data control signal with the call server, and allocates a media channel for transmitting voice data; Restoring voice data transmitted through the assigned media channel in a second user system, playing the same through a speaker, recording and compressing the voice of the first user, and transmitting the data through the media channel; The voice data of the first user transmitted through the media channel is converted into an analog signal at the gateway and transmitted to the second user through a telephone network, and the voice data of the second user is converted into a digital signal to the second user through the media channel. Making a call by transmitting; If the first user decides to hang up after the call, the first user system transmits an end signal to the second user system through the call server and the gateway, then ends the call, and the gateway disconnects the call with the second user. LAN Telephony System, characterized by returning the media channel assigned for the call. The method of claim 7, wherein Calling the second user If the search result fails to provide an external telephone service, the gateway sends a signal to the call server to reject the connection request of the first user; And the call server transmits a signal indicating that the second user is not answering the call or is busy to notify the first user according to the connection request rejection signal. LAN Telephony System. When the first user connected to the data network launches an application system and inputs the telephone number of the second user connected to the data network, the first user system requests the call server for an IP address corresponding to the second user's telephone number. Wow; In response to the IP address request, a call server searching a user address management table and transmitting an IP address of a second user; Requesting a call connection with a second user by a first user according to the transmitted IP address; Transmitting a call connection request signal of the first user to the second user if the call server detects whether the second user is currently registered according to the requested call connection request signal; In response to the transmitted call connection request signal, the second user system searching whether the second user can receive a call; If the second user does not answer the search result, the second user system sends a signal to the first user system to reject the call connection request through a call server to inform the first user that the first user does not answer the call; When the second user receives the call as a result of the search, the gateway notifies the first user that the call is connected through the call server, and then receives a voice media data control signal through the call server and allocates a media channel for voice data transmission. Wow; Restoring voice data transmitted through the assigned media channel in a second user system, playing the same through a speaker, recording and compressing the voice of the first user, and transmitting the data through a media channel to make a call; Allocating a resource to support the call server recognizes that the call should enter the multi call module when the call is connected by inputting the phone number of the third user to perform the multi call and performing the above process. Wow; The multi-call management module in the assigned call server notifying the first to third users that the multi-call has control right, and then newly establishing a voice data channel (multicasting) using a system control signal; Making a first call and a third call using a newly established voice data channel (multicasting) to transmit and receive voice information; If the first user intends to hang up after the multiple call, the first user system disconnects the control channel with the multiple call management module in the call server and returns the resources used for the call; In response to the withdrawal of the first user, when the multi-call management module in the call server notifies the second and third users, the second and third user systems terminate the part for data processing with the first user and then the second. And making a call between third users; If the second user decides to hang up after the call, the second user system disconnects the control channel with the multi-call management module in the call server and returns the resources used for the call; Terminating the portion for data processing with the second user when the third user system informs the third user of the call management module in the call server according to the withdrawal of the second user; And reporting the end of the call to the call server by the multi-call management module in the call server according to the end of the data processing with the second user, the call server returning the resource allocated for the multi-call. LAN Telephony System, characterized by. The method of claim 9, The step of transmitting the call connection request signal of the first user to the second user And if the second user is not registered, further comprising entering a supplementary service module (LAN Telephony System). The method of claim 10, Searching whether the second user can answer the call; And if the second user cannot receive a call, entering the additional service module. When the first user connected to the telephone network inputs the telephone number of the second user connected to the data network, the first user system transmits a signal corresponding to the telephone number to the gateway through the telephone network; In response to the transmitted signal, requesting the location of the second user corresponding to the telephone number from the gateway to the call server, and transmitting the location of the second user to the first user system by referring to a user address management table. Wow; If the gateway requests a call connection with the second user according to the location of the second user, a call server searching for whether the second user is currently registered; Transmitting a call connection request signal from a gateway to a second user if the search result is registered; In response to the transmitted call connection request signal, a second user system searching whether the second user can answer the call; If it is possible to answer the call, the second user system notifies the second user of the call connection request, searches whether the call is received, and connects the call when the call is received; Sending a system control signal notifying the call server not to answer the call if the second user system cannot answer the call or does not answer the call; Transmitting, by the call server, a call connection request signal from the gateway to a voice mailbox servo which is an additional service server according to the transmitted system control signal; Generating a media channel through which the call server and the voice mailbox server transmit voice data to be left in the mailbox using a system control signal; When the voice mailbox server transmits the stored message to the gateway through the created media channel, the gateway converts the stored message into a telephone signal and transmits the converted message to the first user; A first user according to the transmitted message, leaving a message according to a message of a voice mailbox server; And the gateway transmits the message of the first user to a voice mailbox server through a media channel and stores the message.