KR100673175B1 - System and method for interworking videotelephony in different networks - Google Patents

Abstract

Disclosed is a video telephony interworking method in a heterogeneous network that interworks video protocols based on different protocols. To this end, a plurality of different protocol-based video telephone network (Network); A subscriber integration DB which integrates and manages video telephone service subscribers of the video telephone network; And a protocol converter for performing protocol conversion between the networks, the video telephone network comprising: an H.323 protocol based network for a H.323 protocol based video telephone service; SIP network for video telephony service based on SIP (Session Initiation Protocol); The Internet for web-based video telephony services; And at least two of WCDMA networks for 3G-324M based video telephony service, the user can talk to other network subscribers without any inconvenience.

Video Phone, Subscriber Integration DB, Protocol Converter, H.323, SIP, Internet, WCDMA

Description

Video telephony interworking system and its method in heterogeneous networks {SYSTEM AND METHOD FOR INTERWORKING VIDEOTELEPHONY IN DIFFERENT NETWORKS}

1 is a block diagram showing a heterogeneous video telephone interworking system according to the present invention.

Figure 2 is a flow chart showing a heterogeneous video phone interworking method according to the present invention.

* Explanation of Codes on Major Parts of Drawings *

110: H.323 based video phone

120: Gatekeeper

210: web based video phone

220: web phone server

230: web phone gateway

310: SIP-based video call

320: Multimedia Session control system (MSS)

410: 3G-324M based video phone

420: MSC

430: MSCg (MSC gateway)

440: Dual stack Home Location Registry (DHLR)

500: Interworking media gateway (IMG)

600: IP Multimedia Subscriber Registry (IMSR)

The present invention relates to a video telephone call processing system, and more particularly, to a video telephone interworking system and method thereof in a heterogeneous network for interworking video telephony based on different protocols.

Wireless mobile communication ^{technology, 3GPP (3 rd Generation Partnership Projects} ) haewatgo development as GSM, GPRS, WCDMA networks standardized by the international standardization ^{conference, 3GPP2 (3 rd Generation Partnership Projects} 2) normalized by the International Standardization Meeting IS-95A, IS95 -B, CDMA20001x, CDMA1x-EVDO. Among these wireless mobile communication technologies, in the case of the IMT-2000 network, the synchronous IMT-2000 is called CDMA2000 1x-EVDO, and the asynchronous IMT-2000 is called WCDMA.

Here, for video telephony service, WCDMA network is provided based on wired circuit network, and part of ITU-T H.324 protocol standard is changed from 3GPP standardization organization to wireless circuit network and standardized to 3G-324M protocol standard. On the other hand, in the CDMA2000 1x-EVDO network, the ITU-T H.323 protocol standard used in the wired packet network is used for the wireless packet network without a separate standard specification in the wireless network.

On the other hand, SIP (Session Initiation Protocol) based provides a video phone service that integrates the synchronous network and asynchronous network, web phone provides a video phone service using the existing packet data network because the price is low, computer technology It is attracting the spotlight as next generation technology because it can create new service in combination with.

However, since the various video telephone networks are currently operated separately, the subscriber side is inconvenient to subscribe to a network-based video telephone service that requires one day when making a video call to another network subscriber. There is an increasing need for options.

It is an object of the present invention to provide a video telephony interworking system and method thereof in a heterogeneous network interworking video protocol networks based on various protocols.

In order to achieve the above object, heterogeneous video telephone interworking system according to the present invention, a plurality of different protocol-based video telephone network (Network); A subscriber integration DB which integrates and manages video telephone service subscribers of the video telephone network; And a protocol converter for performing protocol conversion between the networks.

Here, the video telephone network includes an H.323 protocol based network for H.323 protocol based video telephone service; SIP network for video telephony service based on SIP (Session Initiation Protocol); The Internet for web-based video telephony services; And at least two of WCDMA networks for 3G-324M based video telephony service.

On the other hand, the first embodiment according to the heterogeneous video phone interworking method of the present invention, (a) H.323 protocol-based video phone (hereinafter, H.323 terminal) transmitting a call setup request message to the GK; (b) the GK searching whether the incoming terminal requested by the H.323 terminal is an H.323 protocol based video telephone subscriber; (c) if the called terminal is not an H.323 subscriber, the GK transmits a location information request message of the called terminal to a subscriber integration DB and receives a response to the message; And (d) setting up a call path between the H.323 terminal and the incoming video call through a protocol converter after the GK transmits a call connection request message to the incoming video call based on the corresponding protocol based on the response. It is characterized by including.

In addition, the second embodiment according to the heterogeneous video phone interworking method of the present invention, (a) 3G-324M based video phone (hereinafter, 3G-324M terminal) transmitting a call setup request message to the MSC; (b) when the MSC sends the called terminal location lookup message to DHLR, the DHLR checking whether the called terminal is a 3G-324M terminal; (c) if the called terminal is not a 3G-324M terminal subscriber as a result of the checking, transmitting a called terminal information inquiry message to the subscriber integration DB and receiving a response to the message; And (d) the MSC transmitting a call connection request message to the incoming video call based on the corresponding protocol based on the response, and then establishing a call path between the 3G-324M terminal and the incoming video call through a protocol converter. It is characterized by including.

In addition, a third embodiment according to the heterogeneous video phone interworking method of the present invention, (a) a step of transmitting a call setup request message to a SIP-based video phone (hereinafter, SIP terminal) to the SIP server; (b) the SIP server transmitting a location information request message of the called terminal to the subscriber integration DB and receiving a response to the message; And (c) the SIP server transmitting a call connection request message to the incoming video call based on the corresponding protocol based on the response, and establishing a call path between the SIP terminal and the incoming video call through a protocol converter. Characterized in that.

In addition, a fourth embodiment according to the heterogeneous video phone interworking method of the present invention includes: (a) transmitting a call setup request message to a web phone gateway by a web-based video phone (hereinafter referred to as web phone); (b) searching, at the web phone server, whether the called terminal requested by the web phone is a web phone subscriber; (c) if the called terminal is not a web phone subscriber, transmitting a location information request message of the called terminal to the subscriber integration DB and receiving a response to the message; And (d) the web phone gateway transmitting a call connection request message to the incoming video call based on the corresponding protocol based on the response, and establishing a call path between the web phone and the incoming video call through a protocol converter. It is characterized by.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. Like reference numerals refer to like or similar elements throughout the drawings.

1 is a block diagram showing a heterogeneous video telephone interworking system according to the present invention.

As shown in Fig. 1, the system includes an H.323 protocol based video telephone network; Web based video telephone network; SIP-based video telephone network; 3G-324M based video telephone network; An IP Multimedia Subscriber Registry (IMSR) 600 that integrates and manages subscribers of the networks; And an interworking media gateway (IMG) 500 that performs protocol conversion between the networks.

The H.323 protocol based video telephony network handles the function of interworking with other multimedia systems in the H.323 protocol system. The H.323 protocol based video telephony network is H.225 (call signaling) or H.323. And at least one gatekeeper (GK) 120 that not only communicates using 245 (control signaling) but also provides an H.323 videophone subscriber database.

The web-based video telephone network assigns a specific IP to a web-based video telephone (hereinafter, referred to as a web phone) 210 and enables the web phone 210 to make a video call service through the IP, and the A web phone gateway 230 for storing a called number corresponding to an IP; It includes a web phone server 220 to perform a web phone subscriber DB role.

In the SIP-based video telephone network, the SIP-based video telephone 310 is assigned a simple IP address or a mobile IP address, and performs SIP registration by accessing based on the assigned IP address. And at least one or more multimedia session control system (MSS) 320 that stores SIP information registered by the MS.

On the other hand, 3G-324M based video phone network, the 3G-324M based video phone 410 subscriber DB (Dual-stack Home Location Register (DHLR) 440); An MSCg (430) serving as a gateway for routing between exchanges in the video telephone network; And at least one exchanger (MSC) 420.

Hereinafter, a method of interworking between video telephone networks will be described with reference to the accompanying drawings.

(First embodiment)

The case where an H.323 protocol based video telephone (hereinafter referred to as an H.323 terminal) is a calling terminal will be described.

First, a call setup request message is transmitted from the H.323 terminal 110 to the GK 120 (S201). Then, the GK 120 retrieves from the GK 120 whether the called terminal requested by the H.323 terminal 110 is an H.323 subscriber (S202).

If the called terminal is not an H.323 subscriber, the GK 120 transmits a location information request message of the called terminal to the IMSR 600 (S203). At this time, the IMSR 600 can know which protocol-based video phone is the called terminal through a DB search.

1) the called terminal is a 3G-324M based video telephone (hereinafter referred to as 3G-324M terminal);

When the IMSR 600 searches in the DB that the called terminal is a 3G-324M terminal 410, the IMSR 600 transmits an information inquiry message of the called terminal to the DHLR 440. Through this, the IMSR 600 receives the type of the called terminal and the subscriber terminal subscriber information from the DHLR 440, and transmits it to the GK 120 again.

Then, the GK 120 transmits a call connection request message to the 3G-324M terminal 410 connected to the MSC 420 via the IMG 500 and the MSCg 430 (S204).

Subsequently, the H.323 terminal 110 negotiates a call connection with the 3G-324M terminal 410 through the IMG 500 (S205). For example, the IMG 500 and the 3G-324M terminal 410 perform H.245 based negotiation, but the negotiation of the H.323 terminal 110 and the IMG 500 may be omitted.

In addition, the H.323 terminal 110 connects the 3G-324M terminal 410 and the video / voice call path through the IMG (500) (S206). After the call is completed, the call is released through the IMG 500 (S207).

2) the called terminal is a SIP-based video telephone (hereinafter referred to as SIP terminal);

When the IMSR 600 detects that the called terminal is the SIP terminal 310 in the DB, the IMSR 600 transmits to the GK 120 that the called terminal is the SIP terminal 310 through a response message. Then, the GK 120 transmits a call connection request message to the SIP terminal 310 connected to the MSS 320 via the IMG 500 (S204). Subsequently, the H.323 terminal 110 negotiates a call connection with the SIP terminal 310 through the IMG 500 and then performs a video / voice call with the SIP terminal 310 through the IMG 500. The furnace is connected (S205-S206). After the call is completed, the call is released through the IMG 500 (S207).

3) the called terminal is a web-based video telephone (hereinafter referred to as web phone);

When the IMSR 600 detects that the called terminal is the web phone 210 in the DB, the IMSR 600 transmits to the GK 120 that the called terminal is the web phone 210 through a response message. Then, the GK 120 transmits a call connection request message to the web phone 210 connected to the web phone gateway 230 via the IMG 500 (S204). That is, the web phone gateway 230 checks whether the subscriber information of the web phone 210 is registered in the DB of the web phone server 220 and transmits a call connection request message to the web phone 210 if it is registered.

Subsequently, the H.323 terminal 110 negotiates a call connection with the web phone 210 through the IMG 500 and then connects the video / audio call path with the web phone 210 through the IMG 500. Connect it (S205-S206). After the call is completed, the call is released through the IMG 500 (S207).

Second Embodiment

A case where a 3G-324M based video telephone (hereinafter, referred to as 3G-324M terminal) is a calling terminal will be described.

First, the 3G-324M terminal 410 transmits a call setup request message (call setup) to the MSC 420 (S201). Subsequently, when the MSC 420 transmits the called terminal location lookup message to the DHLR 440, the DHLR 440 checks whether the called terminal is the 3G-324M terminal 410 (S202).

If the 3G-324M terminal 410 is not, the IMSR 600 transmits the incoming terminal information inquiry message. Then, the IMSR 600 can know through the DB search whether the called terminal is a video call based on which protocol the called terminal is (S203).

1) the called terminal is an H.323 protocol based video telephone (hereinafter referred to as an H.323 terminal);

When the IMSR 600 searches the DB that the called terminal is the H.323 terminal 110, it transmits a response message to the DHLR 440, and the DHLR 440 sends the MSC 420 to the type of the called terminal. Sending terminal subscriber information.

The MSC 420 broadcasts a call connection request message to at least one GK 120 via the MSCg 430 and the IMG 500. Then, the GK 120 interworking with the corresponding H.323 terminal 110 transmits a call connection request message to the H.323 terminal 110 (S204).

Subsequently, the 3G-324M terminal 410 performs negotiation for call connection with the H.323 terminal 110 through the IMG 500 (S205). For example, the IMG 500 and the 3G-324M terminal 410 perform H.245 based negotiation, but the negotiation of the H.323 terminal 110 and the IMG 500 may be omitted.

The 3G-324M terminal 410 connects the H.323 terminal 110 and the video / audio call path through the IMG 500 (S206). After the call is completed, the call is released through the IMG 500 (S207).

2) the called terminal is a SIP-based video telephone (hereinafter referred to as SIP terminal);

When the IMSR 600 searches in the DB that the called terminal is the SIP terminal 310, the IMSR 600 transmits a response message to the DHLR 440, and the DHLR 440 sends the MSC 420 to the type and destination terminal of the called terminal. Send subscriber information.

The MSC 420 transmits a call connection request message to the MSS 320 in which the called terminal is registered via the MSCg 430 and the IMG 500. Then, the MSS 320 transmits the access request message to the corresponding SIP terminal 310 (S204).

Subsequently, the 3G-324M terminal 410 performs negotiation for call connection with the SIP terminal 310 through the IMG 500 (S205). The 3G-324M terminal 410 connects the video / audio call path with the SIP terminal 310 through the IMG 500 (S206). After the call is completed, the call is released through the IMG 500 (S207).

3) the called terminal is a web-based video telephone (hereinafter referred to as web phone);

When the IMSR 600 searches the DB that the called terminal is a web phone 210, the IMSR 600 transmits a response message to the DHLR 440, and the DHLR 440 sends the MSC 420 to the type of the called terminal and the called terminal subscriber. Send the information.

The MSC 420 transmits a call connection request message to the web phone gateway 230 to which the called terminal is connected through the MSCg 430, the IMG 500, and the web phone gateway 230. Then, the web phone gateway 230 transmits a call connection request message to the web phone 210 (S204).

Subsequently, the 3G-324M terminal 410 negotiates a call connection with the web phone 210 through the IMG 500 (S205). The 3G-324M terminal 410 connects the video phone / voice call path with the web phone 210 through the IMG 500 (S206). After the call is completed, the call is released through the IMG 500 (S207).

(Third Embodiment)

A case where a SIP-based video telephone (hereinafter referred to as SIP terminal) is a calling terminal will be described.

First, the SIP terminal 310 transmits a call setup request (INVITE) message to the MSS 320 (S201). Then, the MSS 320 transmits the location information request message of the called terminal to the IMSR 600. At this time, the IMSR 600 first checks whether the subscriber is a SIP subscriber, or otherwise, performs a DB search on which protocol-based video phone the called terminal is (S202-S203).

1) the called terminal is a 3G-324M based video telephone (hereinafter referred to as 3G-324M terminal);

When the IMSR 600 searches in the DB that the called terminal is a 3G-324M terminal 410, the IMSR 600 transmits an information inquiry message of the called terminal to the DHLR 440. In this way, the IMSR 600 receives the type of the called terminal and the subscriber terminal subscriber information from the DHLR 440 and transmits it to the MSS 320 again.

Then, the MSS 320 transmits a call connection request message to the 3G-324M terminal 410 connected to the MSC 420 via the IMG 500 and the MSCg 430 (S204).

Subsequently, the SIP terminal 310 negotiates a call connection with the 3G-324M terminal 410 through the IMG 500 (S205). For example, the IMG 500 and the 3G-324M terminal 410 perform H.245 based negotiation, but the negotiation of the SIP terminal 310 and the IMG 500 may be omitted.

In addition, the SIP terminal 310 connects the 3G-324M terminal 410 and the video / voice call path through the IMG (500) (S206). After the call is completed, the call is released through the IMG 500 (S207).

2) the called terminal is an H.323 protocol based video telephone (hereinafter referred to as an H.323 terminal);

When the IMSR 600 detects that the called terminal is the H.323 terminal 110 in the DB, it transmits to the MSS 320 that the called terminal is the H.323 terminal 110 through a response message. The MSS 320 then broadcasts the call connection request message to the at least one GK 120 via the IMG 500. Then, the GK 120 interworking with the corresponding H.323 terminal 110 transmits a call connection request message to the H.323 terminal 110 (S204).

Subsequently, after the SIP terminal 310 negotiates a call connection with the H.323 terminal 110 through the IMG 500, the SIP terminal 310 performs video / video with the H.323 terminal 110 through the IMG 500. The voice call path is connected (S205-S206). After the call is completed, the call is released through the IMG 500 (S207).

3) the called terminal is a web-based video telephone (hereinafter referred to as web phone);

When the IMSR 600 detects that the called terminal is a web phone 210 in the DB, the IMSR 600 transmits a response message that the called terminal is the web phone 210 to the MSS 320. Then, the MSS 320 transmits the call connection request message to the web phone 210 connected to the web phone gateway 230 via the IMG 500. That is, the web phone gateway 230 checks whether the subscriber information of the web phone 210 is registered in the web phone server 220, and if so, transmits a call connection request message to the web phone 210 (S204).

Subsequently, the SIP terminal 310 negotiates a call connection with the web phone 210 through the IMG 500 and then connects the video / voice call path with the web phone 210 through the IMG 500. (S205-S206). After the call is completed, the call is released through the IMG 500 (S207).

(Example 4)

The case where the web-based video telephone (hereinafter referred to as web phone) is the calling terminal will be described.

First, the call setup request message is transmitted from the web phone 210 to the web phone gateway 230 (S201). Then, the web phone gateway 230 retrieves from the web phone server 220 whether the called terminal requested by the web phone 210 is a web-based video telephone subscriber (S202).

If the called terminal is not a web-based video telephone subscriber, the web phone gateway 230 transmits a location information request message of the called terminal to the IMSR 600 (S203). At this time, the IMSR 600 can know which protocol-based video phone is the called terminal through a DB search.

1) the called terminal is a 3G-324M based video telephone (hereinafter referred to as 3G-324M terminal);

When the IMSR 600 searches in the DB that the called terminal is a 3G-324M terminal 410, the IMSR 600 transmits an information inquiry message of the called terminal to the DHLR 440. Through this, the IMSR 600 receives the type of the called terminal and the subscriber terminal subscriber information from the DHLR 440, and transmits it to the web phone gateway 230 again.

Then, the web phone gateway 230 transmits a call connection request message to the 3G-324M terminal 410 connected to the MSC 420 via the IMG 500 and the MSCg 430 (S204).

Subsequently, the web phone 210 performs negotiation for call connection with the 3G-324M terminal 410 through the IMG 500 (S205). For example, the IMG 500 and the 3G-324M terminal 410 perform H.245 based negotiation, but the negotiation of the web phone 210 and the IMG 500 may be omitted.

In addition, the web phone 210 connects the 3G-324M terminal 410 and the video / voice call path through the IMG (500) (S206). After the call is completed, the call is released through the IMG 500 (S207).

2) the called terminal is an H.323 protocol based video telephone (hereinafter referred to as an H.323 terminal);

When the IMSR 600 searches that the called terminal is the H.323 terminal 110 in the DB, the IMSR 600 transmits to the web phone gateway 230 that the called terminal is the H.323 terminal 110 through a response message. The web phone gateway 230 then broadcasts the call connection request message to the at least one GK 120 via the IMG 500. Then, the GK 120 interworking with the corresponding H.323 terminal 110 transmits a call connection request message to the H.323 terminal 110 (S204).

Subsequently, the web phone 210 negotiates a call connection with the H.323 terminal 110 through the IMG 500 and then performs video / audio with the H.323 terminal 110 through the IMG 500. The call paths are connected (S205-S206). After the call is completed, the call is released through the IMG 500 (S207).

3) the called terminal is a SIP-based video telephone (hereinafter referred to as SIP terminal);

When the IMSR 600 retrieves that the called terminal is the SIP terminal 310 in the DB, the IMSR 600 transmits the response message that the called terminal is the SIP terminal 310 to the web phone gateway 230. Then, the web phone gateway 230 transmits a call connection request message to the SIP terminal 310 connected to the MSS 320 via the IMG 500. That is, the MSS 320 checks whether the subscriber information of the SIP terminal 310 is registered in its DB, and if so, transmits a call connection request message to the corresponding SIP terminal 310 (S204).

Subsequently, the web phone 210 negotiates a call connection with the SIP terminal 310 through the IMG 500 and then connects the video / audio call path with the SIP terminal 310 through the IMG 500. (S205-S206). After the call is completed, the call is released through the IMG 500 (S207).

While the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will recognize that various modifications or changes can be made without departing from the spirit and scope of the invention.

As described above, according to the present invention, it is possible to provide a video call service between heterogeneous networks, so that the user can talk to other network subscribers without any inconvenience.

Claims (25)

A video telephone network including an H.323 protocol based network for H.323 protocol based video telephony service and a WCDMA network for 3G-324M based video telephony service; Internet for SIP or web-based video telephone service for SIP (Session Initiation Protocol) based video telephone service further included in the video telephone network; A subscriber integration DB which integrates and manages video telephone service subscribers of the video telephone network; And A protocol converter for performing protocol conversion between the networks; The H.323 protocol based network, At least one gatekeeper that not only communicates with H.323 protocol based video telephony using H.225 (call signaling) or H.245 (control signaling) but also provides H.323 protocol based video telephony subscriber DB. Include, The WCDMA network, Dual-stack Home Location Register (DHLR) providing the 3G-324M based video telephone subscriber DB; A gateway for routing between exchanges in the WCDMA network; And At least one exchanger, The SIP network, The SIP-based videophone is assigned a simple IP address or a mobile IP address, performs a SIP registration by accessing the IP address, and stores the SIP information registered by the SIP-based videophone. At least one SIP server, The internet is A web phone gateway which assigns a specific IP to a web-based video telephone identification phone number and provides the web-based video telephone service through the IP; And A web phone server for storing an IP address corresponding to the identification phone number and providing the web-based video telephone subscriber DB; The protocol converter, When the H.323 protocol based network, the WCDMA network and the Internet are the calling networks, the video call subscription network of the called terminal is first checked through a gatekeeper, a dual-stack home location register (DHLR), and a web phone server. If the videophone subscription network of the called terminal is not based on the calling network, the type of the called terminal and the information on the called terminal subscriber are provided by confirming the videophone subscription network of the called terminal through the subscriber integration DB. Through the video call connection between the originating network and the destination network, When the SIP network is the calling network, the video call connection is performed between the calling network and the called network through the type of the called terminal and the called terminal subscriber information provided by integrating and determining the video telephone subscription network of the called terminal through the subscriber integration DB. Heterogeneous video telephone interworking system, characterized in that the execution. delete delete delete delete delete In a heterogeneous video telephone interworking method for an H.323 protocol based video telephone (hereinafter referred to as an H.323 terminal) to set up a call using a SIP protocol or a web protocol based video telephone, (a) the H.323 terminal transmitting a call setup request message to the GK; (b) a GK retrieving from the GK whether the called terminal requested by the H.323 terminal is an H.323 protocol based video telephone subscriber; (c) if the called terminal is not an H.323 subscriber, the GK sends a location information request message of the called terminal to a subscriber integration DB and receives a response to the message; And (d) after the GK transmits a call connection request message to the incoming video call based on the corresponding protocol based on the response, establishing a call path between the H.323 terminal and the incoming video call through a protocol converter; Heterogeneous video phone interworking method characterized in that. delete The method of claim 7, wherein step (d), (d-1) if the response is a SIP-based video call (hereinafter referred to as SIP terminal), the subscriber integration DB transmitting the response message that the called terminal is a SIP terminal to the GK; (d-2) the GK transmitting a call connection request message to the SIP terminal registered with the SIP server via a protocol converter; (d-3) the H.323 terminal negotiating a call connection with the SIP terminal through the protocol converter; And (d-4) The H.323 terminal heterogeneous video telephone interworking method comprising the step of connecting the SIP / video and voice call path through the protocol converter. The method of claim 7, wherein step (d), (d-1) if the response is a web-based video call (hereinafter referred to as a web phone), the subscriber integration DB transmitting the response message that the called terminal is a web phone to the GK; (d-2) the GK transmitting a call connection request message to a web phone connected to a web phone gateway via a protocol converter; (d-3) the H.323 terminal negotiating a call connection with the web phone through the protocol converter; And (d-4) heterogeneous video telephone interworking method comprising the step of connecting the web phone and the video / voice call through the H.323 terminal protocol converter. In a heterogeneous video telephone interworking method for a 3G-324M protocol based video telephone (hereinafter referred to as H.323 terminal) to set up a call using a SIP protocol or a web protocol based video telephone, (a) the 3G-324M terminal transmitting a call setup request message to an MSC; (b) when the MSC sends the called terminal location lookup message to DHLR, the DHLR checking whether the called terminal is a 3G-324M terminal; (c) if the called terminal is not a 3G-324M terminal subscriber as a result of the checking, transmitting a called terminal information inquiry message to the subscriber integration DB and receiving a response to the message; And (d) the MSC transmitting a call connection request message to the incoming video call based on the corresponding protocol based on the response, and then establishing a call path between the 3G-324M terminal and the incoming video call through a protocol converter; Heterogeneous video phone interworking method characterized in that. delete The method of claim 11, wherein step (d) (d-1) if the response is a SIP-based video call (hereinafter referred to as a SIP terminal), the subscriber integration DB transmitting a response message to a DHLR by the subscriber terminal as a SIP terminal; (d-2) the DHLR transmitting the type of the called terminal and the called terminal subscriber information to an MSC; (d-3) the MSC transmitting a call connection request message to the SIP server in which the called terminal is registered through the MSCg and the protocol converter; (d-4) the SIP server transmitting a connection request message to a corresponding SIP terminal; (d-5) the 3G-324M terminal negotiating a call connection with a SIP terminal through the protocol converter; And and (d-6) the 3G-324M terminal connecting the SIP terminal and the video / audio call path through the protocol converter. The method of claim 11, wherein step (d) (d-1) if the response is a web-based video call (hereinafter referred to as a web phone), the subscriber integration DB transmitting a response message to the DHLR via the response message that the called terminal is a web phone; (d-2) the subscriber integration DB transmitting the type of the called terminal and the called terminal subscriber information to an MSC; (d-3) the MSC transmitting a call connection request message to the web phone gateway to which the called terminal is connected via MSCg and a protocol converter; (d-4) the web phone gateway transmitting a call connection request message to the web phone; (d-5) the 3G-324M terminal negotiating a call connection with the web phone through the protocol converter; And (d-6) the 3G-324M terminal connecting the web phone and the video / voice call via the protocol converter; heterogeneous video telephone interworking method comprising a. (a) transmitting a call setup request message to a SIP server by a SIP-based video telephone (hereinafter referred to as a SIP terminal); (b) the SIP server transmitting a location information request message of the called terminal to the subscriber integration DB and receiving a response to the message; And (c) the SIP server transmitting a call connection request message to the incoming video call based on the corresponding protocol based on the response, and establishing a call path between the SIP terminal and the incoming video call through a protocol converter; Heterogeneous video phone interworking method, characterized in that. The method of claim 15, wherein step (c) is (c-1) if the response is a 3G-324M based video telephone (hereinafter, referred to as 3G-324M terminal), the subscriber integration DB sending an information inquiry message of the called terminal to DHLR; (c-2) receiving, by the subscriber integration DB, the type of the called terminal and the called terminal subscriber information from the DHLR, and transmitting the received information to the SIP server; (c-3) the SIP server transmitting a call connection request message to a 3G-324M terminal connected to the MSC via a protocol converter and MSCg; (c-4) the SIP terminal negotiating a call connection with a 3G-324M terminal via the protocol converter; And (c-5) the heterogeneous video telephone interworking method comprising the step of connecting the video terminal / voice call path with the 3G-324M terminal through the protocol converter. The method of claim 15, wherein step (c) is (c-1) if the response is an H.323 protocol based video telephone (hereinafter referred to as an H.323 terminal), the subscriber integration DB transmitting the H.323 terminal to the SIP server through a response message; ; (c-2) the SIP server broadcasting a call connection request message to at least one GK via a protocol converter; (c-3) transmitting a call connection request message to the H.323 terminal by a GK interworking with the corresponding H.323 terminal; (c-4) the SIP terminal negotiating a call connection with an H.323 terminal through the protocol converter; And and (c-5) the SIP terminal connecting the H.323 terminal with a video / voice call through the protocol converter. The method of claim 15, wherein step (c) is (c-1) if the response is a web-based video call (hereinafter referred to as a web phone), the subscriber integration DB transmitting the response message indicating that the called terminal is a web phone to the SIP server; (c-2) the SIP server transmitting a call connection request message to a web phone connected to a web phone gateway via a protocol converter; (c-3) the SIP terminal negotiating a call connection with the web phone through the protocol converter; And (c-4) heterogeneous video telephone interworking method comprising the step of connecting the video phone and the voice call to the web phone via the SIP protocol protocol converter. (a) transmitting a call setup request message to a web phone gateway by a web-based video telephone (hereinafter referred to as a web phone); (b) searching, at the web phone server, whether the called terminal requested by the web phone is a web phone subscriber; (c) if the called terminal is not a web phone subscriber, transmitting a location information request message of the called terminal to the subscriber integration DB and receiving a response to the message; And (d) the web phone gateway transmitting a call connection request message to the incoming video call based on the corresponding protocol based on the response, and setting up a call path between the web phone and the incoming video call through a protocol converter; Heterogeneous video phone interworking method characterized in that. The method of claim 19, wherein step (d) (d-1) if the response is a 3G-324M based video telephone (hereinafter, referred to as 3G-324M terminal), the subscriber integration DB sending an information inquiry message of the called terminal to DHLR; (d-2) receiving, by the subscriber integration DB, the type of the called terminal and the called terminal subscriber information from the DHLR, and transmitting the received information to the web phone gateway; (d-3) the web phone gateway transmitting a call connection request message to a 3G-324M terminal connected to the MSC via a protocol converter and MSCg; (d-4) the web phone negotiating a call connection with a 3G-324M terminal via the protocol converter; And (d-5) the heterogeneous video telephone interworking method comprising the step of connecting the web phone with a 3G-324M terminal and a video / voice call through the protocol converter. The method of claim 19, wherein step (d) (d-1) if the response is an H.323 protocol based video telephone (hereinafter referred to as an H.323 terminal), the subscriber integration DB transmitting a response message to the web phone gateway that the called terminal is an H.323 terminal. ; (d-2) the web phone gateway broadcasting a call connection request message to at least one GK via a protocol converter; (d-3) transmitting a call connection request message to the H.323 terminal by a GK interworking with the corresponding H.323 terminal; (d-4) the web phone negotiating a call connection with an H.323 terminal through the protocol converter; And (d-5) the heterogeneous video telephone interworking method comprising the step of the web phone connecting the video / audio call path with the H.323 terminal through the protocol converter. The method of claim 19, wherein step (d) (d-1) if the response is a SIP-based video telephone (hereinafter referred to as SIP terminal), the subscriber integration DB transmitting the response message that the called terminal is a SIP terminal to the web phone gateway; (d-2) the web phone gateway transmitting a call connection request message to the SIP terminal registered in the SIP server via a protocol converter; (d-3) the web phone negotiating a call connection with the SIP terminal through the protocol converter; And (d-4) heterogeneous video telephone interworking method comprising the step of the web phone to connect the video / voice call path with the SIP terminal through the protocol converter. delete delete delete

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