KR100702777B1 - System and method for videotelphony mmc service in different networks - Google Patents

Abstract

Disclosed are a video mailbox service system and method for heterogeneous networks that provide a video mail service from one network-based video phone to the other network-based video phone when a packet network-based video call and a circuit network-based video call are interworked. . That is, a system for providing a video mailbox service between a packet network and a circuit network, the system comprising: a gatekeeper for providing a video telephone call processing and a subscriber DB for providing a video telephone service in a packet network; An IMG that performs protocol conversion between the packet network and the circuit network; IMSR, which is an integrated subscriber DB of the packet network subscriber and the circuit network subscriber; DHLR, the subscriber DB of the circuit network; MSCg serving as a gateway for routing between exchanges in the circuit network; MSC, which is an exchanger of said circuit network; A first video mailbox server connected to the GK and IMG to provide a video mailbox service to a video network based on a packet network, and a second video mailbox server connected to the MSC and IMG to provide a video mailbox service to a video network based on a circuit network. By providing a system including a, a video mailbox service can be provided to each video telephone between a heterogeneous network including a packet network based H.323 video telephone and a circuit network based 3G-324M video telephone.

Video call, packet network, circuit network, subscriber DB, IMG, video mailbox

Description

Video mailbox service system and its method in heterogeneous networks {SYSTEM AND METHOD FOR VIDEOTELPHONY MMC SERVICE IN DIFFERENT NETWORKS}

1 is a view showing a video mailbox service system in a heterogeneous network according to an embodiment of the present invention.

2A to 2B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a packet network to a circuit network according to the first embodiment of the present invention.

3A to 3B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a packet network to a circuit network according to a second embodiment of the present invention.

4A to 4B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a packet network to a circuit network according to a third embodiment of the present invention.

5A to 5B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a packet network to a circuit network according to a fourth embodiment of the present invention.

* Explanation of Codes on Major Parts of Drawings *

110: H.323 videophone

120: Gate Keeper

130: Interworking Medium Gateway (IMG)

140: IP Multimedia Subscriber Register (IMSR)

150: Dual-stack Home Location Register (DHLR)

160: MSCg (MSC gateway)

170, 190: MSC

180: 3G-324M video phone

210: 323 MMC (Multimedia Messaging Center based PS)

220: 324 MMC (Multimedia Messaging Center based CS)

The present invention relates to a video mailbox service system and a method thereof, and more particularly, to a video mailbox from one network based video telephony to the other network based video telephony when interworking with a packet network based video telephony and a circuit network based video telephony. The present invention relates to a video mailbox service system and a method for providing heterogeneous networks.

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.

Video telephony service in IMT-2000 network is provided based on wired circuit network in WCDMA network and standardized to 3G-324M protocol standard by partially changing ITU-T H.324 protocol specification to 3GPP standardization organization to wireless circuit network. On the other hand, ITU-T H.323 protocol standard used in wired packet network in CDMA2000 1x-EVDO network is optimized for wireless packet network without additional standard in wireless network.

On the other hand, Korean Patent Application No. 2003-09630 provides a video mailbox service to the calling terminal when a video phone call is not connected to the same network (CDMA2000 1x-EVDO network) or unconditionally provides a video mailbox service to the calling terminal. The video mailbox service system and method for leaving a video message even if not supported have been described.

Therefore, there is an urgent need for a method capable of providing a video mailbox service between the aforementioned heterogeneous networks, that is, a packet network based video telephone and a circuit network based video telephone.

The present invention has been drawn to solve the above problems, an object of the present invention is to provide a video mail service between a packet network-based video call and a circuit network-based video phone service in heterogeneous networks A system and method are provided.

In order to achieve the above object, a video mailbox service system in a heterogeneous network according to the present invention includes a gate keeper (GK) for providing a videophone call processing and subscriber DB for providing a videophone service in a packet network; An Interworking Media Gateway (IMG) for performing protocol conversion between the packet network and the circuit network; An IP Multimedia Subscriber Register (IMSR), which is an integrated subscriber DB of the packet network subscriber and the circuit network subscriber; Dual-stack Home Location Register (DHLR) which is a subscriber DB of the circuit network; MSC, which is an exchanger of said circuit network; An MSCg serving as a gateway for routing between exchanges in the circuit network; A first video mailbox server for providing a video mailbox service to the packet network based video telephone; And a second video mailbox server for providing a video mailbox service to the circuit-based video telephone.

On the other hand, the video mailbox service method in a heterogeneous network provided after a video call attempt from a packet network based video telephone (hereinafter referred to as an outgoing video telephone) to a circuit network based video telephone (hereinafter referred to as an incoming video telephone), Inquiring a video telephone corresponding to a called number in the packet network; (b) if the video call corresponding to the called number is not in the packet network, the calling video call performs a call connection to the called video call; (c) the outgoing video call attempting to connect to the first videomail server after performing a call transfer from the incoming videophone to the first videomail server; (d) providing the videomail service to the calling videophone by the first videomail server after performing an H.245 negotiation between the calling videophone and the first videomail server; And (e) the first video mailbox server terminating the call connection with the outgoing videophone.

In addition, a video mail service method in a heterogeneous network provided after an attempt to make a video call from a circuit network based video call (hereinafter referred to as an outgoing video call) to a packet network based video call (hereinafter referred to as an incoming video call) is provided. Retrieving a video call corresponding to a called number in the circuit network; (b) if the video call corresponding to the called number is not in the circuit network, the outgoing video call attempts to connect to the incoming video call; (c) the outgoing video call performing a call connection to the video mailbox server; (d) after the H.245 negotiation between the calling videophone and the videomail server, the videomail server providing the videomail service to the calling videophone; And (e) the videomail server terminating the call connection with the outgoing videophone.

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 view showing a video mailbox service system in a heterogeneous network according to an embodiment of the present invention.

As shown in Fig. 1, the system provides a video mailbox service between a packet network (H.323 video phone 110 is connected) and a circuit network (3G-324M video phone 180 is connected). A system comprising: a gatekeeper (Gate Keeper, GK) 120 for providing a videophone call processing and subscriber DB for providing a videophone service in a packet network; An IMG (Interworking Media Gateway, 130) for performing protocol conversion between the packet network and the circuit network; An IP Multimedia Subscriber Register (IMSR) 140 which is an integrated subscriber DB of the packet network subscriber and the circuit network subscriber; A dual-stack home location register (DHLR) 150 which is a subscriber DB of the circuit network; An MSCg (MSCg) 160 serving as a gateway for routing between exchanges in the circuit network; MSC 170, which is an exchanger of the circuit network; A first video mailbox server (323 Multimedia Messaging Server, 323 MMC, 210) connected to the GK (120) and the IMG (130) to provide a video mailbox service for a packet network based video call, and the MSC (170) and IMG ( And a second video mailbox server (324 Multimedia Messaging Server, 324MMC, 220) that is connected to the network 130 and provides a video mail service to a circuit network based video phone.

Here, the GK 120 processes functions interworking with other multimedia systems in the H.323 protocol system, heterogeneous networks (circuit networks in this embodiment), call setup, protocol conversion for release, media conversion, and the like. The GK 120 communicates with the H.323 videophone 110 using H.225 (call signaling) or H.245 (control signaling) as well as providing an H.323 videophone subscriber DB. .

In addition to the video phone subscriber DB role, the IMSR 140 plays the role of a subscriber DB for additional services such as IM, PTT, coloring, video mailbox service, and the like.

The MSCg 160 is an MSC serving as a gate of the packet network and the circuit network as an MSC gateway, and the MSC 170 and the MSC 170 represent an exchange in a home network and an exchange in a visited network, respectively.

The 323MMC 210 and the 324MMC 220 each include a video mailbox DB (not shown) for storing and managing video and audio information.

Hereinafter, a video mailbox service method in a heterogeneous network according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(First embodiment)

When a video call is attempted from a packet network-based video telephone (hereinafter referred to as a called terminal) to a circuit network-based video telephone (hereinafter referred to as a called terminal) according to the first embodiment of the present invention, the power of the called terminal is turned off (Power Off). ) Describes the video mailbox service provided.

2A to 2B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a packet network to a circuit network according to the first embodiment of the present invention.

1) Inquiry of incoming terminal in packet network

First, when the calling terminal 110 transmits an outgoing request message (ARQ, Admission Request) to the GK 120, the GK 120 searches for the subscriber in the H.323 video call in its DB, and then H. If it is not the subscriber of the 323 video phone, the message (Cx_LIR (Location Information Request)) requesting the subscriber location information of the called terminal 170 is transmitted to the IMSR 140 (S201-S202).

The IMSR 140 checks the called subscriber in its DB based on the request message from the GK 120 (ie, whether to subscribe to a video call service), and then sends a subscriber information request message (DHLR 150) to the circuit network. When the MAP_AnyTimeSubInterrogation) is transmitted, the DHLR 150 transmits a response message (MAP_AnyTimeSubInterrogation_Ack) to the subscriber information request message to the IMSR 140, and the IMSR 140 sends the called terminal 180 to the GK 120. It transmits a Cx_LIA (Location Information Ack) message indicating that this is a 3G-324M video phone (S203-S205). At this time, the response message transmits the video telephone type information (eg, H.323 video telephone, SIP video telephone, 3G-324M video telephone, etc.) of the called terminal 180.

Subsequently, the GK 120 transmits a location information request message (LRQ, Location Request) of the called terminal 180 to the IMG 130, and the IMG 130 checks the location with the response message of the LRQ to the GK 120. The message (LCF, Location Confirm) is transmitted (S206-S207). Subsequently, the GK 120 transmits an Admission Confirm (ACF) message for the ARQ message to the calling terminal 110 (S208).

Based on the above-described process, the GK 120 knows that the called terminal 180 is a 3G-324M video phone based on a circuit network.

2) Packet network based video call is sent to circuit network based video call

Thereafter, the calling terminal 110 transmits a call setup request message (setup) to the IMG 130 through the GK 120 (S209-S210), and the IMG 130 sends the calling terminal through the GK 120. The call setup progress message (Call Proceeding) message is transmitted to (110) (S211-S212). At the same time, the IMG 130 transmits a pre-call setup request message (IAM (TMR, USI)) to the MSCg 160 to access the circuit network (S213).

When the MSCg 160 requests the location information (MAP_SRI (UDI)) of the called terminal 180 to the DHLR 150 according to the preset call setup message, the DHLR 150 sends the MSC 170 to the called terminal. Request for routing information provision (MAP_PRN (UDI)) (180) (S214-S215).

3) After the call transfer is performed from the called terminal to the 324 video mailbox server 220, the call is connected to the 323 video mailbox server 210.

Regarding the routing information request message for the destination terminal 180 of the DHLR 150, the MSC 170 confirms that the destination terminal 170 is powered off, and the DHLR 150 for the routing request message. In step S216, status information (MAP_PRN_Ack (Absent Subscriber)) of the called terminal 170 is transmitted. At this time, the DHLR 150 transmits the routing number 324MMC 220 previously set as the response message to the request message of the MSCg 160 to the MSCg 160 (S217).

Accordingly, the MSCg 160 sends a pre-call setup request message (IAM (TMR, USI)) to the 324MMC 220 through the MSC 170 in order to provide the video mailbox service to the calling terminal 110 through the response message. It transmits (S218-S219). At this time, the USI of the ISUP message includes a routing number for connection to the 324MMC 220.

On the other hand, when the 324MMC 220 sends a session release request message (REL) to the MSC 170, the MSC 170 releases the session with the response message (ACM) that has confirmed the request message (IAM) of step 218 The request message REL is transmitted to the IMG 130 via the MSCg 160 (S220-S222). At this time, the REL message includes the location information of the 323MMC (210).

Subsequently, the IMG 130 notifies the GK 120 that the release of the session has been completed (RelCom (Release Complete)) with respect to the session release request message (S223). At this time, the session release completion message includes a routing number of 323MMC (210).

Thereafter, the GK 120 transmits a call setup request message (Setup) to the 323MMC 210, which is the video mailbox server specified in the session release completion message (S224). Then, the 323MMC 210 transmits the GK 120. ) Transmits an ARQ (Admission Request) message, which is an acceptance request message, and the GK 120 transmits an ACF (Admission Confirm) message to the 323MMC 210 as an acknowledgment message for the ARQ message (S225-226). In this case, the ACF message includes a call signaling channel transport address to the GK 120.

In addition, the 323MMC 210 transmits a call setup progress request message (Call Proceeding) in response to the setup message of step 224 to the call signaling channel transport address, and includes its call signaling channel transport address in the Facility message. Send it to the calling terminal 110 through the GK (120), and "Connecting to the video mailbox. After being connected, a call charge will be added ”to the calling terminal 110 (S227-S230).

4) H.245 Negotiation and Video Mailbox Service

Subsequently, the 323MMC 210 starts an H.245 negotiation for call connection with the calling terminal 110 (S231). In this case, the 323MMC 210 and the calling terminal 110 negotiate a master / slave decision (MSD), a codec and a media capability set (TCS) that can be supported between both video phones. Perform.

After the negotiation is completed, when the 323MMC 210 transmits a call connection request message (connect) to the calling terminal 110 via the GK 120, the 323MMC 210 is an image to the calling terminal 110 Mailbox service can be provided (S232-S224). That is, the calling terminal 110 may record a video message, or leave a confirmation, e-mail, or the like in the video mailbox DB.

5) Terminate call connection with video mailbox server

Thereafter, when the video mailbox service is completed, the 323MMC 210 transmits a call release completion message to the calling terminal 110 through the GK 120, and the GK 120 transmits the call completion message. After receiving the call termination message (Disengage Request, DRQ) from the 323MMC 210 and the originating terminal 110, respectively, and sends a confirmation message (DCF, Disengage Confirm) for the DRQ terminal 110 and the 323MMC (210) By transmitting to the call connection is released (S225-S240).

Second Embodiment

When there is no response of the called terminal when a video call is attempted from a packet network based video telephone (hereinafter referred to as a called terminal) to a circuit network based video telephone (hereinafter referred to as a called terminal) according to the second embodiment of the present invention (No Answer) ), The provided video mailbox service method.

3A to 3B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a packet network to a circuit network according to a second embodiment of the present invention.

1) Inquiry of incoming terminal in packet network

First, when the calling terminal 110 transmits an ARQ (Admission Request) message to the GK 120, the GK 120 searches for the subscriber of the H.323 video call in its DB, and then H If it is not the subscriber of the .323 video phone, the message (Cx_LIR (Location Information Request)) requesting the subscriber location information of the called terminal 170 is transmitted to the IMSR 140 (S301-S302).

The IMSR 140 checks the called subscriber in its DB based on the request message from the GK 120 (ie, whether to subscribe to a video call service), and then requests a subscriber information to the DHLR 150 of the circuit network (MAP_AnyTimeSubInterrogation). Message, the DHLR 150 transmits a response message (MAP_AnyTimeSubInterrogation_Ack) to the subscriber information request message to the IMSR 140, and the IMSR 140 sends the called terminal 180 to the GK 120. It sends a Cx_LIA (Location Information Ack) message indicating that this is a 3G-324M video phone (S303-S305). At this time, the response message transmits the video telephone type information (eg, H.323 video telephone, SIP video telephone, 3G-324M video telephone, etc.) of the called terminal 180.

Subsequently, the GK 120 requests the location information (LRQ) of the called terminal 180 to the IMG 130, and the IMG 130 sends the location message (LCF) to the GK 120 as a response message of the LRQ. It transmits (S306-S307). Then, the GK 120 transmits an acknowledgment message (ACF) for the ARQ message to the calling terminal 110 (S308).

Based on the above-described process, the GK 120 knows that the called terminal 180 is a 3G-324M video phone based on a circuit network.

2) Packet network based video call is sent to circuit network based video call

The calling terminal 110 transmits a call setup request message (setup) to the IMG 130 through the GK 120 (S309-S310), and the IMG 130 sends the calling terminal 110 through the GK 120. Call setup progress message (Call Proceeding) message (S311-S312). At the same time, the IMG 130 transmits a pre-call setup request message (IAM (TMR, USI)) to the MSCg 160 (S313).

Subsequently, the MSCg 160 requests the location information (MAP_SRI (UDI)) of the called terminal 180 from the DHLR 150, and the DHLR 150 sends routing information of the called terminal 180 to the MSC 170. Request for provision (MAP_PRN (UDI)) (S314-S315).

In response to the routing information request message for the destination terminal 180 of the DHLR 150, the MSC 170 transmits a response message MAP_PRN_Ack (MSRN) to the DHLR 150 (S316). In this case, the MSRN indicates routing information to the called terminal 180. The DHLR 150 transmits a response message (MAP_SRI (UDI, MSRN)) to the MAP_SRI (UDI) message to the MSCg 160 (S317). That is, the position information on the video call is transmitted, and the MSCg 160 transmits a pre-call setup request message (IAM (TMR, USI)) for transmitting the video call to the MSC 170 (S318).

Through the above-described process, the IMG 130 obtains the location information of the called terminal 180 in the circuit network, and transmits an ISUP message to the MSC 170 linked with the called terminal 180.

Subsequently, when the MSC 170 transmits a Setup message to the called terminal 180 (S319), the called terminal 180 passes through the MSC 170, the MSCg 160, the IMG 130, and the GK 120. An incoming response message is transmitted to the calling terminal 110, that is, the setup message and the alerting message, which is a response message for the ISUP message, and an ACM (Address Confirm) message, respectively (S320-S324).

3) After the call transfer is performed from the called terminal to the 324 video mailbox server 220, the call is connected to the 323 video mailbox server 210.

On the other hand, in step 319, when there is no response from the called terminal 180 with respect to the Setup message from the MSC 170 to the called terminal 180 (No Answer), the video terminal service is provided to the calling terminal 110. To provide, the MSC 170 transmits a pre-call setup request message (IAM (TMR, USI)) to the 324MMC 220 (S325). At this time, the USI of the ISUP message includes a routing number for access to the 324MMC 220.

Thereafter, the 324MMC 220 transmits a session release request message (REL) to the MSC 170, and the MSC 170 transmits the REL message to the IMG 130 via the MSCg 160 (S326-S328). . At this time, the REL message includes the location information of the 323MMC (210).

The IMG 130 transmits a RelCom (Release Complete) message to the GK 120 indicating that the session release is completed with respect to the session release request message REL (S329). At this time, the session release completion message includes a routing number of 323MMC (210).

Accordingly, the GK 120 transmits a request message (setup) to set up a call to the 323MMC 210, which is a video mailbox server designated in the session release completion message (S330). Subsequently, when the 323MMC 210 transmits an acceptance request message (ARQ) to the GK 120, the GK 120 transmits an acknowledgment message (ACF) for the ARQ message to the 323MMC 210 (S331-). S332). In this case, the ACF message includes a call signaling channel transport address to the GK 120.

Then, after the 323MMC 210 transmits a call setup progress request message (Call Proceeding) to the call signaling channel transport address, the 323MMC 210 requests the call connection to the calling terminal 110 through the GK 120. When the message (connect) is transmitted, its call signaling channel transmission address is included in the facility message and transmitted to the calling terminal (110) via the GK (120), and is connected to the video mailbox. After being connected, a call charge will be added ”to send the announcement message to the calling terminal 110 (S333-S338).

4) H.245 Negotiation and Video Mailbox Service

The 323MMC 210 starts an H.245 negotiation for call connection with the calling terminal 110 (S339). In this case, the 323MMC 210 and the calling terminal 110 negotiate a master / slave decision (MSD), a codec and a media capability set (TCS) that can be supported between both video phones. Perform.

After the negotiation is completed, the 323MMC 210 may provide a video mailbox service to the calling terminal 110 (S340). That is, the calling terminal 110 may record a video message, or leave a confirmation, e-mail, or the like in the video mailbox DB.

5) Termination of call to video mailbox server

Thereafter, when the video mailbox service is provided, the 323MMC 210 transmits a call release completion message to the calling terminal 110 through the GK 120, and the GK 120 sends the 323MMC. After receiving the call termination message (Disengage Request, DRQ) from the 210 and the originating terminal 110, respectively, by transmitting a DCF (Disengage Confirm) to the originating terminal 110 and the 323MMC 210, the call connection is released (S341-S346).

(Third Embodiment)

In the case where a video call is attempted from a circuit network based video telephone (hereinafter referred to as a called terminal) to a packet network based video telephone (hereinafter referred to as a called terminal) according to the third embodiment of the present invention, the power of the called terminal is turned off (Power Off) ), When the called terminal sets the call transfer to the unconditional video mailbox (MMC Unconditional, MMCU), and the called terminal is busy (Busy) describes the video mailbox service method provided.

4A to 4B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a circuit network to a packet network according to a third embodiment of the present invention.

1) Search incoming terminal in circuit network

When the 3G-324M video telephone 180 (hereinafter referred to as a calling terminal) dials the called number, a call setup message is transmitted to the MSC 170 (S401). The MSC 170 requests the location information (MAP_SRI (UDI)) of the terminal corresponding to the called number to the DHLR 150 (S402). The DHLR 150 transmits a MAP_SRI message to the MSC 170 informing that the terminal corresponding to the called number is an H.323 subscriber, not a circuit based terminal (S403). Then, the MSC 170 transmits a pre-call setup request message (IAM (TMR, USI)) to the IMG 130 via the MSCg 160 (S404).

The MSC 170 interworking with the calling terminal 180 through the above-described process knows that the called terminal 110 does not exist in the circuit network and transmits an ISUP message including the called number to the IMG 130.

2) Incoming terminal in packet network

Therefore, when the IMG 130 broadcasts the location information request message (LRQ) of the H.323 video phone 110 (hereinafter referred to as a called terminal) corresponding to the called number to at least one or more GKs 120, the incoming call is received. The GK 120 interworking with the terminal 110 transmits a response message (LCF) of the LRQ to the IMG 130 (S405-S406). At this time, the LCF includes the current state information of the called terminal 110. For example, the status information includes a case in which the power is off, the video mailbox unconditional switching (MMCU) state, or the busy state.

3) Call connection to video mailbox server

Thereafter, the IMG 130 transmits a call setup request message (setup) with the 323MMC 210 to the GK 120, and the GK 120 also transmits a setup message to the 323MMC 210 (S407-S408). Accordingly, the 323MMC 210 transmits an acceptance request message (ARQ) to the GK 120, and the GK 120 transmits a call setup response message (ACF) to the 323MMC 210 (S409-S410).

In addition, the 323MMC 210 transmits a Call Proceeding message to the IMG 130 through the GK 120 in response to the Setup message of step 409, and then sets the call to the IMG 130. The request message (Connect) is transmitted (S411-S412).

Then, the IMG 130 transmits an acknowledgment message (ACM) to the MSC 170 in response to the ISUP message of step 404, and the MSC 170 alerts in response to the call setup message of step 401. The message is transmitted to the calling terminal 180 (S413-S414). Subsequently, when the IMG 130 transmits an acknowledgment message (ANM) to the MSC 170 based on the call setup request message Connect from the 323MMC 210 of step 412, the MSC 170 sends the calling terminal 180. ) And call connection (S415-S416).

4) H.245 Negotiation and Video Mailbox Service

Then, the IMG 130 performs an H.245 negotiation with the calling terminal 180 (S417). That is, the calling terminal 180 and the IMG 130 determine a master / slave determination (MSD), a codec and media capability set (terminal capability set (TCS)) that can be supported between both video phones, and open a logical channel. Negotiate information for call access, such as Open Logical Channel (OLC) and Multiplex Table Signaling (MES).

In addition, the IMG 130 performs an H.245 negotiation with the 323MMC 210 (S418). At this time, information for master / slave determination (MSD), terminal capability set (TCS) logical channel open (OLC), and call connection are negotiated.

323MMC (210) is connected to the video mailbox. After being connected, a call charge will be added ”to the calling terminal 180 (S419).

After transmitting the guide message, the 323MMC 210 may provide a video mailbox service to the calling terminal 180 (S420). That is, the calling terminal 180 may record a video message, or leave a confirmation, e-mail, or the like in the video mailbox DB.

5) Call termination with video mailbox server

Then, when the video mailbox service is completed, the 323MMC 210 transmits a call release completion message to the IMG 130 via the GK 120 and ends the call to the GK 120. After transmitting a message (Disengage Request, DRQ), and receives a DCF (Disengage Confirm) to the 323MMC 210 (S421-S424). When the IMG 130 transmits a session release request message REL to the MSC 170, the MSC 170 transmits a release completion message RLC to the IMG 130 (S425-S426). . Then, the MSC 170 transmits the session release message (Release) to the calling terminal 180, the call connection is released (S427).

(Example 4)

When a video call is attempted from a circuit network based video telephone (hereinafter referred to as a called terminal) to a packet network based video telephone (hereinafter referred to as a called terminal) according to the fourth embodiment of the present invention, there is no response of the called terminal (No Answer), how to provide video mailbox service.

5A to 5B are flowcharts illustrating a video mailbox service method after an attempt to make a video call from a circuit network to a packet network according to a fourth embodiment of the present invention.

1) Search incoming terminal in circuit network

When the 3G-324M video telephone 180 (hereinafter referred to as a calling terminal) dials the called number, a call setup message is transmitted to the MSC 170 (S501). The MSC 170 requests the location information of the terminal corresponding to the called number (MAP_SRI (UDI)) to DHLR (S502). In addition, the DHLR 150 transmits to the MSC 170 a MAP_SRI message indicating that the terminal corresponding to the called number is not a circuit network based terminal but an H.323 subscriber (S503). Then, the MSC 170 transmits a pre-call setup request message (IAM (TMR, USI)) to the IMG 130 via the MSCg 160 (S504).

The MSC 170 interworking with the calling terminal 180 through the above-described process knows that the called terminal 110 does not exist in the circuit network and transmits an ISUP message including the called number to the IMG 130.

2) Incoming terminal in packet network

Therefore, when the IMG 130 broadcasts the location information request message (LRQ) of the H.323 video phone 110 (hereinafter referred to as a called terminal) corresponding to the called number to at least one or more GKs 120, the incoming call is received. The corresponding GK 120 interworking with the terminal 110 transmits a response message (LCF) of the LRQ to the IMG 130 (S505-S506).

Thereafter, when the IMG 130 transmits a call setup request message with the destination terminal 110 to the GK 120, the GK 120 synchronizes the TCP connection with the destination terminal 110. When the TCP Sync control message is transmitted and the terminating terminal 110 transmits a TCP connection setup message for establishing a TCP connection to the GK 120, the GK 120 sets up a call setup request message to the terminating terminal 110. It transmits (S507-S510).

Subsequently, when the called terminal 110 transmits an acceptance request message (ARQ) to the GK 120, the GK 120 transmits a call setup response message (ACF) to the called terminal 110 (S511-S512).

The incoming terminal 110 transmits a call setup progress message to the IMG 130 through the GK 120 and then responds to the setup message through the GK 120 and the IMG 130. The message (Alerting) is transmitted, and the IMG 130 transmits a response message (ACM, Alert) for the ISUP message to the calling terminal 180 through the MSCg 160 and the MSCo 190 (S513-S517). .

3) Call connection to video mailbox server

Here, the GK 120 knows that the called terminal 110 does not have a response (No Answer), and transmits a call release completion message (Release Complete) to the called terminal 110, provides a video mailbox service The call transfer is performed to the 323MMC 210 (S518).

That is, when the GK 120 transmits a call setup request message (setup) to the 323MMC 210, the 323MMC 210 transmits an acceptance request message (ARQ) message to the GK 120 and the GK 120. The call setup response message (ACF) is transmitted to the 323MMC 210 (S519-S520).

In addition, the 323MMC 210 transmits a call setup progress message to the GK 120, and then transmits a connect message for call connection to the GK 120, and the GK 120 transmits an IMG 130. ) Transmits a connect message for a call connection (S521-S523). Subsequently, when the IMG 130 transmits an acknowledgment message (ANM) to the MSC 170, the MSC 170 connects a call with the calling terminal 170 (S524-S525).

4) H.245 Negotiation and Video Mailbox Service

Subsequently, when the 323MMC 210 transmits a Facility message to the IMG 130, the IMG 130 performs an H.245 negotiation with the calling terminal 180 (S526-S528). That is, the originating terminal 180 and the IMG 130 have a master / slave decision (MSD), terminal capability set (TCS), open logical channel (OLC), multiplex table signaling (Multiplex). Negotiate information for call access, such as Table Signaling (MES).

The IMG 130 also performs H.245 negotiation with the 323MMC 210. At this time, Master / Slave Determination (MSD), Codec and Media Capability Set (TCS) that can be supported between both video phones, Open Logical Channel (OLC), Call connection Negotiate information.

323MMC (210) is connected to the video mailbox. After the connection is made, a call charge is added to the call message ”to the calling terminal 180 (S529).

After transmitting the guide message, the 323MMC 210 may provide a video mailbox service to the calling terminal 180 (S530). That is, the calling terminal 180 may record a video message, or leave a confirmation, e-mail, or the like in the video mailbox DB.

5) Call termination with video mailbox server

Then, when the video mailbox service is completed, the 323MMC 210 transmits a call release completion message to the IMG 130 via the GK 120 and ends the call to the GK 120. After transmitting a message (Disengage Request, DRQ), and receives a DCF (Disengage Confirm) to the 323MMC 210 (S531-S534). When the IMG 130 transmits a session release request message REL to the MSC 170, the MSC 170 transmits a release completion message RLC to the IMG 130 (S535-S536). . Then, the MSC 170 transmits a session release message (Release) to the originating terminal 180, the call connection is released (S537).

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 mailbox service to each video phone between a heterogeneous network including a packet network-based H.323 video phone and a circuit network-based 3G-324M video phone.

Claims (25)

A gate keeper (GK) providing a videophone call processing and subscriber DB for providing a videophone service in a packet network; An Interworking Media Gateway (IMG) for performing protocol conversion between the packet network and the circuit network; An IMSR (IP Multimedia Subscriber Register) which is an integrated subscriber DB for the video mailbox service subscribed to by the packet network subscriber and the circuit network subscriber; Dual-stack Home Location Register (DHLR) which is a subscriber DB of the circuit network; MSC, which is an exchanger of said circuit network; An MSCg serving as a gateway for routing between exchanges in the circuit network; A first video mailbox server for providing a video mailbox service to the packet network based video telephone; And And a second video mailbox server for providing a video mailbox service to the circuit network-based video telephone. delete delete In a video mail service method in a heterogeneous network provided after an attempt to make a video call from a packet network based video telephone (hereinafter referred to as an outgoing video telephone) to a circuit network based video telephone (hereinafter referred to as an incoming video telephone), (a) querying a video call corresponding to a called number in the packet network; (b) if the video call corresponding to the called number is not in the packet network, the calling video call performs a call connection to the called video call; (c) the outgoing video call attempting to connect to the first videomail server after performing a call transfer from the incoming videophone to the first videomail server; (d) providing the videomail service to the calling videophone by the first videomail server after performing an H.245 negotiation between the calling videophone and the first videomail server; And and (e) the first video mailbox server terminating the call connection with the outgoing video telephone. The method of claim 4, wherein step (b) comprises: (b-1) the originating video call transmitting a call setup request message (setup) to the IMG via a GK; (b-2) the IMG sending a pre-call setup request message to MSCg for access to a circuit network; (b-3) when the MSCg requests the location information of the incoming video call to DHLR, the DHLR requesting the MSC to provide routing information of the incoming video call; And and (b-4) the MSC transmitting the status information of the incoming video call to the DHLR. 6. The method of claim 5, wherein the state information of the incoming video telephone is in a power off state. The method of claim 4 or 5, wherein the step (a), (a-1) the originating video call sending an ARQ message to the GK; (a-2) the GK acquiring subscriber information of an incoming video call through IMSR and DHLR; And (a-3) the video mail service method in a heterogeneous network, wherein the GK transmits a call setup response message to the outgoing video telephone. The method of claim 4 or 5, wherein step (c) (c-1) the MSC performing a call connection with a second video mailbox server based on state information of an incoming video telephone; (c-2) the second video mailbox server releasing the session with the GK, and then transmitting location information of the first video mailbox server to the GK; (c-3) transmitting, by the GK, a call setup request message to the first video mailbox server; (c-4) establishing a call with the GK by the first video mailbox server; (c-5) The first video mailbox server comprises the step of transmitting a guide message to the outgoing video telephone video mailbox service method in a heterogeneous network. The method of claim 4 or 5, wherein the step (d), (d-1) negotiating, by the first video mailbox server and the outgoing video call, a determination of a master / slave codec and a media capability; (d-2) after the negotiation is completed, transmitting, by the first video mailbox server, a call connection request message (connect) to the outgoing video telephone 110 through the GK; And and (d-3) the first video mailbox server providing a video mailbox service to the outgoing video call. In a video mail service method in a heterogeneous network provided after a video call attempt from a packet network-based video phone (hereinafter referred to as an outgoing video call) to a circuit network-based video call (hereinafter referred to as an incoming video call), (a) querying a video call corresponding to a called number in the packet network; (b) if the video call corresponding to the called number is not in the packet network, the calling video call attempts to connect to the incoming video call; (c) performing a call connection to the first video mailbox server after the outgoing video telephone performs a call transfer from the incoming video telephone to a first video mailbox server; (d) providing the videomail service to the calling videophone by the first videomail server after performing an H.245 negotiation between the calling videophone and the first videomail server; And (e) the first video mailbox server terminating the call connection with the outgoing video call, wherein step (b) comprises: (b-1) the originating video call transmitting a call setup request message (setup) to the IMG via a GK; (b-2) the IMG sending a pre-call setup request message to MSCg for access to a circuit network; (b-3) the MSCg acquiring the location information of the incoming video call through DHLR and the MSC; (b-4) the MSCg transmitting a pre-call setup request message to the MSC for transmitting the video telephone call based on the obtained location information of the incoming video telephone; (b-5) the MSC sending a setup message to the incoming videophone; And (b-6) the MSC transmitting the status information of the incoming videophone to the outgoing videophone via the MSC, MSCg, IMG, and GK. The video mailbox service method in a heterogeneous network according to claim 10, wherein the status information of the incoming video telephone is No Answer. The method of claim 10, wherein step (a) comprises: (a-1) the originating video call sending an ARQ message to the GK; (a-2) the GK acquiring subscriber information of an incoming video call through IMSR and DHLR; And (a-3) the video mail service method in a heterogeneous network, wherein the GK transmits a call setup response message to the outgoing video telephone. The method of claim 10 or 12, wherein step (c) (c-1) the MSC performing a call connection with a second video mailbox server based on state information of an incoming video telephone; (c-2) after the second video mailbox server releases the session with the GK, transmitting location information of the first video mailbox server to the GK; (c-3) transmitting, by the GK, a call setup request message to the first video mailbox server; (c-4) establishing a call with the GK by the first video mailbox server; And (c-5) The first video mailbox server comprises the step of transmitting a guide message to the outgoing video telephone video mailbox service method in a heterogeneous network. The method of claim 10 or 12, wherein the step (d), (d-1) negotiating, by the first video mailbox server and the outgoing video call, a determination of a master / slave codec and a media capability; (d-2) after the negotiation is completed, transmitting, by the first video mailbox server, a call connection request message (connect) to the outgoing video telephone 110 through the GK; And and (d-3) the first video mailbox server providing a video mailbox service to the outgoing video call. In a video mail service method in a heterogeneous network provided after an attempt to make a video call from a circuit network based video telephone (hereinafter referred to as an outgoing video telephone) to a packet network based video telephone (hereinafter referred to as an incoming video telephone) (a) querying a video telephone corresponding to a called number in the circuit network; (b) if the video call corresponding to the called number is not in the circuit network, the outgoing video call attempts to connect to the incoming video call; (c) the outgoing video call performing a call connection to the video mailbox server; (d) after the H.245 negotiation between the calling videophone and the videomail server, the videomail server providing the videomail service to the calling videophone; And and (e) the videomail server terminating the call connection with the outgoing videophone. The method of claim 15, wherein step (c) is (c-1) the IMG transmitting a call setup request message to the video mailbox server through a GK; (c-2) when the video mailbox server transmits an ARQ (Admission Request) message to the GK, the GK transmitting an ACF (Admission Confirm) message to the video mailbox server; (c-3) The video mailbox server sends a call setup request message to the IMG through the GK in response to the setup message of step (c-1), and then a call setup request message to the IMG ( Connect); And (c-4) if the IMG transmits a response message to the MSC, the MSC performs a call connection with the outgoing videophone. The method of claim 15 or 16, wherein step (a) is, (a-1) when the outgoing video call dials a predetermined called number, a call setup message is transmitted to the MSC; (a-2) the MSC transmitting a message requesting the location information of the incoming video call corresponding to the called number to DHLR; (a-3) the DHLR transmitting a message indicating to the MSC that the incoming video call corresponding to the called number is not a circuit network based video telephone subscriber but a packet network based video telephone subscriber; And (a-4) The MSC sends a pre-call setup request message to the IMG via the MSCg. The method of claim 15 or 16, wherein step (b) is (b-1) the IMG broadcasting a Location Request (LRQ) message for requesting location information of an incoming video call to at least one or more GKs; And and (b-2) transmitting the LCF (Location Confirm) message to the IMG as a response message of the LRQ to a corresponding GK interworking with the incoming videophone. 19. The heterogeneous method of claim 18, wherein the LCF message includes status information of any one of a state in which the incoming video telephone is powered off, an unconditional switching to a video mailbox, and a busy state. Video mailbox service method in network. The method of claim 15 or 16, wherein step (d), (d-1) the IMG performing H.245 negotiation with the originating videophone with the host / species determination, supportable codec and media capability determination, logical channel opening, and multiplex table signaling; (d-2) performing, by the IMG, H.245 negotiation with the video mailbox server on the determination of a master / slave, supportable codec and media capability, and logical channel opening; (d-3) the videomail server transmitting a guide message to the outgoing videophone; And (d-4) the video mailbox server providing a video mailbox service to the outgoing video telephone. In a video mail service method in a heterogeneous network provided after an attempt to make a video call from a circuit network based video telephone (hereinafter referred to as an outgoing video telephone) to a packet network based video telephone (hereinafter referred to as an incoming video telephone), (a) querying a video telephone corresponding to a called number in the circuit network; (b) if the video call corresponding to the called number is not in the circuit network, the outgoing video call attempts to connect to the incoming video call; (c) the outgoing video call performing a call connection to the video mailbox server; (d) after the H.245 negotiation between the calling videophone and the videomail server, the videomail server providing the videomail service to the calling videophone; And (e) the video mailbox server terminating the call connection with the outgoing videophone, wherein step (b) includes: (b-1) the IMG broadcasting a Location Request (LRQ) message for requesting location information of an incoming video call to at least one or more GKs; (b-2) transmitting, by the corresponding GK interworking with the incoming videophone, an LCF (Location Confirm) message to the IMG as a response message of the LRQ; (b-3) the IMG attempting to set up a call to the incoming videophone via the GK; (b-4) the incoming video call transmitting a response message to the calling terminal through the GK, IMG, and MSC to the call establishment attempt; And (b-5) the GK transmitting a call release completion message to the incoming videophone. 22. The method of claim 21, wherein the response message of step (b-4) includes status information of a current incoming video call in an unresponsive state. The method of claim 21, wherein step (a), (a-1) when the outgoing video call dials a predetermined called number, a call setup message is transmitted to the MSC; (a-2) the MSC transmitting a message requesting the location information of the incoming video call corresponding to the called number to DHLR; (a-3) the DHLR transmitting a message indicating to the MSC that the incoming video call corresponding to the called number is not a circuit network based video telephone subscriber but a packet network based video telephone subscriber; And (a-4) The MSC sends a pre-call setup request message to the IMG via the MSCg. The method of claim 21, wherein step (c) comprises: (c-1) the GK transmitting a call setup request message to the video mailbox server; (c-2) when the video mailbox server transmits an ARQ (Admission Request) message to the GK, the GK transmitting an ACF (Admission Confirm) message to the video mailbox server; (c-3) the video mailbox server transmitting a call setup progress message to a local GK, and then transmitting a call setup request message (Connect) to the IMG via the GK; And (c-4) The IMG sends an ANM message to the MSC, and the MSC performs a call connection with the outgoing videophone. The method of claim 21, wherein step (d) (d-1) the IMG performing H.245 negotiation with the originating videophone with the host / species determination, supportable codec and media capability determination, logical channel opening, and multiplex table signaling; (d-2) performing, by the IMG, H.245 negotiation with the video mailbox server on the determination of a master / slave, supportable codec and media capability, and logical channel opening; (d-3) the videomail server transmitting a guide message to the outgoing videophone; And (d-4) the video mailbox server providing a video mailbox service to the outgoing video telephone.

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