KR100923390B1 - Method for interworking between voip network and wcdma network - Google Patents

Abstract

The present invention relates to an interworking method between a VoIP network and a WCDMA network, and to provide an interworking method between a VoIP network and a WCDMA network capable of providing a video call service between a WCDMA terminal and a VoIP video terminal.

To this end, the present invention provides a method for interworking between a VoIP network and a WCDMA network, comprising: a message forwarding step of converting a video call request message from the VoIP network into an ISUP protocol message and transmitting it to the WCDMA network; A voice call call connection step of connecting a voice call call as the called WCDMA terminal is a video call impossible terminal; And converting and transmitting a voice call signal between the originating terminal of the VoIP network and the called WCDMA terminal into a corresponding protocol message, wherein the voice call call connection step is performed by a gateway mobile communication switching center through a home location register. Confirming whether the called WCDMA terminal is a terminal capable of a video call, and transmitting a video call failure message to the multimedia trunk gateway according to the terminal that is unable to make a video call; Transmitting, by the multimedia trunk gateway, a message including a cause of video call impossibility to a second soft switch; Sending, by the second softswitch, a voice call request message to a signaling gateway; And converting the voice call request message received by the signaling gateway into an initial address message (IAM) and transmitting the converted voice call request message to a public telephone network, which is used in a video call service between a VoIP network and a WCDMA network.

VoIP, WCDMA, Video Call, Number Transfer

Description

Interworking method between BIPIP network and BCDMA network {METHOD FOR INTERWORKING BETWEEN VOIP NETWORK AND WCDMA NETWORK}

The present invention relates to an interworking method between a VoIP network and a WCDMA network. More particularly, the interworking method for providing a video call service between a VoIP network and a WCDMA network by interworking a VoIP video call network and a WCDMA video call network. It is about.

Voice Over Internet Protocol (VoIP) is a core technology of Internet telephony, and provides a voice call service provided by a public switched telephone network (PSTN) using Internet Protocol (IP) technology.

Video call service has been commercialized in Internet-based VoIP networks. In a VoIP network, signaling is performed via H.323 or Session Initiation Protocol (SIP), voice data is encoded via G.711 or G.729, G.723.1, and H.263 or MPEG- The video call service is provided by encoding video data through 4 and exchanging packet data. In this case, SIP is a signaling protocol in which terminals to communicate on the Internet identify each other, find a location, and specify creation, deletion, and change of a multimedia communication session. SIP can be used in both Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), and the SIP URL is used to distinguish each user. do. SIP is a text-based protocol developed by borrowing much of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP). It is flexible and extensible to combine various protocols to create various services.

On the other hand, with the development of 3G mobile communication technology, video call service is enabled in mobile communication environment. The third generation mobile communication is divided into asynchronous wideband code division multiple access (WCDMA) and a synchronous CDMA2000 (code division multiple access 2000). In Korea, WCDMA services are being activated. In the WCDMA scheme, signaling is performed through the H.324M protocol of the 3rd Generation Partnership Project (3GPP), voice data is compressed through an Adaptive Multi-Rate (AMR) CODEC, and image data is transmitted through H.263 or MPEG-4. Is compressed and transmitted to provide a video call service.

As WCDMA video call service is recently activated, video call service interworking between VoIP network and WCDMA network is required. Therefore, a companion device capable of converting different protocols and media is required.

As a related art, Korean Patent Publication "Video call interworking system and method between broadband mobile communication network and high speed internet network (application number: 10-2003-0055732)" refers to video call interworking system and method between WCDMA network and high speed internet network. This has been presented. However, in such a prior art, a video call service is provided only between an H.324M terminal of a WCDMA network and an H.323 terminal of a high-speed Internet network, and a new interworking device for signal processing is required between a high-speed Internet network and a WCDMA network. For video signal addressing, the IP address and MSISDN (Mobile Station ISDN) number are used.

Accordingly, there is a need for an interworking method capable of providing a video call service between a VoIP network and a WCDMA network by processing voice and video signals by interworking a VoIP network and a WCDMA network without a separate new interworking device.

In addition, even when the subscriber of the WCDMA network, which is a 3rd generation (3G) system, changes the service from the 2nd generation (2G) system (number transfer), the video call service should be provided, and when the video call request fails, the voice call A video call service that can be switched to should be provided.

The present invention has been proposed to meet the above requirements, and provides a video call service between a WCDMA terminal and a VoIP video terminal, but when the WCDMA terminal is a terminal that does not support a video call, providing a voice call service through a PSTN. The purpose of the present invention is to provide an interworking method between a VoIP network and a WCDMA network.

According to an aspect of the present invention, there is provided a method for interworking between a VoIP network and a WCDMA network, the method comprising: a message forwarding step of converting a video call request message from the VoIP network into an ISUP protocol message and delivering the message to the WCDMA network; A voice call call connection step of connecting a voice call call as the called WCDMA terminal is a video call impossible terminal; And converting and transmitting a voice call signal between the originating terminal of the VoIP network and the called WCDMA terminal into a corresponding protocol message, wherein the voice call call connection step is performed by a gateway mobile communication switching center through a home location register. Confirming whether the called WCDMA terminal is a terminal capable of a video call, and transmitting a video call failure message to the multimedia trunk gateway according to the terminal that is unable to make a video call; Transmitting, by the multimedia trunk gateway, a message including a cause of video call impossibility to a second soft switch; Sending, by the second softswitch, a voice call request message to a signaling gateway; And converting the voice call request message received by the signaling gateway into an initial address message (IAM) and transmitting the converted voice call request message to a public telephone network.

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As described above, the present invention can provide a video call service between a WCDMA terminal and a VoIP video terminal by interworking an existing VoIP network and an existing WCDMA network without a separate new interworking device. Even if the number is transferred to 3G, the video call service can be provided, and in case of a video call failure due to the WCDMA subscriber's terminal and other abnormalities, the call can be switched to the voice call to enable the call.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a network system to which the present invention is applied, and an embodiment of a VoIP network and a WCDMA network.

As shown in FIG. 1, a network system to which the present invention is applied includes a WCDMA terminal 101, a WCDMA network 103, a multimedia trunk gateway (MTG, 105), a VoIP network 107, and a VoIP terminal ( 109).

The WCDMA terminal 101 may be a 3G videophone WCDMA terminal supporting the H.324M protocol as an embodiment, but the present invention is not limited thereto.

The WCDMA network 103 includes a Mobile Switching Center (MSC, 111), a Gateway Mobile Communication Switching Station (Gateway MSC, GMSC, 113), and a Home Location Register (HLR) 115, and an ISUP. Signaling is performed using a protocol.

The MSC 111 is a WCDMA exchange performing a circuit switching function, the GMSC 113 is a gateway exchange performing an interworking function for other networks, and the HLR 115 is mobile subscriber information and location information, basic / It is a system for storing and managing additional service information.

Here, the ISUP, which stands for ISDN User Part (ISP), defines a procedure used for setting up, managing, and releasing a public switched telephone network (PSTN) for transmitting protocol, voice, and video data. In the present invention, the ISUP defines a procedure used for setting up, managing, and releasing a WCDMA network 103 connected to a VoIP network 107 instead of a general switched telephone network (PSTN).

The MTG 105 is a device for converting signaling and media between a wired IP network and a wireless WCDMA network, and is an image gateway system for converting voice and video signals for interworking video services between heterogeneous networks. For example, in order to exchange signals between the SIP protocol used in the VoIP network and the ISUP protocol in the WCDMA network, voice and video signals transmitted from the VoIP network are converted and transmitted to the WCDMA network.

The VoIP network 107 includes Softswitch-Class4, SSW-C4, 121, Softswitch-Class5, SSW-C5, 123, and Number Portability Database, NPDB, 125).

The SSW-C4 121 is a VoIP signal processing device for interworking with other networks, and processes protocols such as SIP, H.323, Megaco, etc., and the SSW-C5 123 is a VoIP signal for accepting a VoIP terminal. As a processing device, the SIP protocol is supported, and the NPDB 125 provides a number porting service when the subscriber changes the operator to another local telephone or mobile telephone provider without changing his or her telephone number.

The VoIP terminal 109 may be a VoIP video telephone VoIP terminal supporting the SIP protocol as an embodiment, but the present invention is not limited thereto. For example, the VoIP terminal 109 may be a VoIP terminal supporting the H.323 protocol.

FIG. 2 is a flowchart illustrating an interworking method in the case of WCDMA origination and VoIP reception. The protocol (for example, H.324M, etc.) described in FIG. 2 is illustrated as an embodiment.

As shown in Fig. 2, when the user of the WCDMA terminal 101 first presses the number of the user of the VoIP terminal 109 (for example, a number beginning with 070) and presses a video call button (here, the WCDMA terminal 101 Since the voice call button and the video call button are separately, for the video call with the VoIP terminal 109, the WCDMA terminal user presses the 070 number of the VoIP terminal and presses the video call button.}, The WCDMA terminal 101 A SETUP message is transmitted to the MSC 111 (s201).

The MSC 111 transmits a call proceeding message indicating that a call setup is in progress to the WCDMA terminal 101 (S202). (H.324M protocol)

Next, the MSC 111 transmits an IAM (Initial Address Message) to the GMSC 113 (s203). (ISUP protocol)

Here, IAM is a message transmitted to initiate the occupation of the relay line and transmit the number and other information necessary for signal processing and route setting, and has the same meaning as a SETUP message.

Next, the GMSC 113 transmits the IAM transmitted from the MSC 111 to the MTG 105 (s204). (ISUP protocol)

Next, the MTG 105 converts the IAM transmitted from the GMSC 113 into an INVITE message, and transmits the INVITE message to the SSW-C4 121 (s205). (SIP protocol)

In this case, the INVITE message is a message transmitted from a user agent client (UAC) initiating a SIP request to a server when starting a SIP session, that is, making a call. It may be sent directly to the responding user agent server (UAS).

The INVITE message includes Prefix / Postfix information and includes Session Description Protocol (SDP) information of the VoIP terminal 109 for media negotiation.

Next, the SSW-C4 121 transmits the INVITE message transmitted from the MTG 105 to the SSW-C5 123 (S206). (SIP protocol)

Next, the SSW-C5 123 transmits the INVITE message transmitted from the SSW-C4 121 to the VoIP terminal 109 (s207). (SIP protocol)

Next, the VoIP terminal 109 transmits a 180 ringing message to the SSW-C5 123 indicating that the VoIP terminal 109 is ringing (S208).

Here, the 180 ring message is an information message used in response to the information requested by the client.

Next, the SSW-C5 123 transmits the 180 ring message transmitted from the VoIP terminal 109 to the SSW-C4 121 (s209). (SIP protocol)

Next, the SSW-C4 121 transmits the 180 ring message transmitted from the SSW-C5 123 to the MTG 105 (S210). (SIP protocol)

Next, the MTG 105 converts the transmitted 180 ring message into an address assignment complete message (ADDRESS COMPLETE MASSAGE, ACM) used in the ISUP protocol, and transmits the ACM to the GMSC 113 (s211). (ISUP protocol)

Here, the ACM is a message indicating that all address information necessary for signal setting up to the called party has been received.

Next, the GMSC 113 transmits the ACM transmitted from the MTG 105 to the MSC 111 (s212). (ISUP protocol)

Next, the MSC 111 transmits an Alerting message transmitted from the GMSC 113 to the WCDMA terminal 101 (s213). (H.324M protocol)

Here, the alerting message is a message having the same meaning as the ACM of the ISUP protocol in the H.324M protocol.

Next, when the user of the VoIP terminal 109 receives a call, the VoIP terminal 109 transmits a 200 OK message, which is a response to the INVITE message, to the SSW-C5 123 (s214). (SIP protocol)

The 200 OK message is a successful message for the INVITE message.

Next, the SSW-C5 123 transmits the 200 OK message transmitted from the VoIP terminal 109 to the SSW-C4 121 (s215). (SIP protocol)

Next, the SSW-C4 121 transmits the 200 OK message transmitted from the SSW-C5 123 to the MTG 105 (S216). (SIP protocol)

Next, the MTG 105 converts the transmitted 200 OK message into a response message (Answer Messege, ANM), and transmits the ANM to the GMSC 113 (s217). (ISUP protocol)

The ANM is a message indicating that the called party responds to the signal.

Next, the GMSC 113 transmits the ANM transmitted from the MTG 105 to the MSC 111 (s218). (ISUP protocol)

Next, the MSC 111 transmits a CONNECT message indicating the response of the VoIP terminal 109 to the WCDMA terminal 101 (s219). (H.324M protocol)

The CONNECT message is a message having the same meaning as the ANM of the ISUP protocol in the H.324M protocol.

Next, the MTG 105 transmits an acknowledgment (ACK) message, which is a response to the INVITE message, to the SSW-C4 121 (S220). (SIP protocol)

The ACK message is a user agent client (UAC) receives a final response message for the INVITE message, a reply message for the final response message, the ACK message is transmitted whether the final response is successful (Success) or failed (Fail) .

Next, the SSW-C4 121 transmits an ACK message transmitted from the MTG 105 to the SSW-C5 123 (S221). (SIP protocol)

Next, the SSW-C5 123 transmits the ACK message transmitted from the SSW-C4 121 to the VoIP terminal 109 (s222). (SIP protocol)

Next, when the line is connected in step 201 to step 222, H.245 media negotiation is performed between the WCDMA terminal 101 and the MTG 105 (s223). (H.324M protocol)

Here, H.245 is a control signal protocol for H.323 multimedia communication, and is used to exchange H.245 messages in communication between H.323 terminals, and the H.245 messages exchange terminal credentials and logical channels. Message to open and close. Therefore, H.245 media negotiation means communication negotiation between terminals using H.245.

Next, after the media negotiation is completed, voice and video data are transmitted between the WCDMA terminal 101 and the VoIP terminal 109 (s224).

Here, media is transmitted in a time division multiplexer (TDM) manner between the WCDMA terminal 101 and the MTG 105 (line section), and an RTP between the MTG 105 and the VoIP terminal 109 (IP section). Media is transmitted in a real-time transport protocol.

In addition, the TDM scheme means time division multiplexing, in which a plurality of low-speed subchannels share one high-speed transmission line by sequentially dividing a data transmission time of one transmission line by a time slot. As a transport layer communication protocol for transmitting and receiving voice and moving pictures in real time, unlike a resource reservation protocol (RSVP), it is executed between terminals without depending on a communication network device such as a router.

In addition, the RTP scheme is a transport layer communication protocol for transmitting and receiving voice and moving pictures in real time, and is characterized in that it is executed between terminals without depending on a communication network device such as a router. In the RTP scheme, the sender can abandon a packet with a high delay by using a time stamp, and the receiver checks a transmission delay or bandwidth and notifies a higher level application of the sender to service by adjusting the coding rate. Quality can be controlled.

3 is a flowchart illustrating an interworking method in the case of VoIP origination and WCDMA reception, and the protocol described in FIG. 3 (for example, H.324M, etc.) is illustrated as an embodiment.

As shown in FIG. 3, when a user of the VoIP terminal 109 first transmits a video signal to communicate with the WCDMA terminal 101, the VoIP terminal 109 transmits an INVITE message to the SSW-C5 123. (S301). The INVITE message includes Prefix / Postfix information and includes SDP (Session Description Protocol) information of the VoIP terminal 109 for media negotiation. (SIP protocol)

Here, since the VoIP terminal 109 does not have a voice call button and a video call button separately, there are three methods for transmitting a video signal from the VoIP terminal 109 to the WCDMA terminal 101 as follows.

[1] Prefix + 010 + Call Button

[2] 010 number + Postfix + Call button

[3] 010 number + video call button (When the VoIP terminal has a voice call button and a video call button separately, and when the video call button is pressed, the same method as the first method is used. have.)

Prefix / Postfix used in the above three methods is used to route signals from SSW to MTG, and signals without Prefix are routed to voice signals through SSW-C4.

 Next, the SSW-C5 123 transmits a 100 Trying message indicating that the signal connection is in progress to the VoIP terminal 109 (s302). (SIP protocol)

Next, the SSW-C5 123 transmits an INVITE message to the SSW-C4 121 using a prefix / postfix transmitted from the VoIP terminal 109 (s303). (SIP protocol)

Next, the SSW-C4 121 transmits an INVITE message transmitted from the SSW-C5 123 to the MTG 105 (s304). (SIP protocol)

Next, the MTG 105 converts the INVITE message transmitted from the SSW-C4 121 into IAM, and transmits the IAM to the GMSC 113 (s305). (ISUP protocol)

Next, the GMSC 113 performs an inquiry to the HLR 115 for subscriber information confirmation (s306). In the HLR query process, it is checked whether the WCDMA terminal 101 is a terminal capable of a normal video call.

Next, when the WCDMA terminal 101 is a terminal capable of a normal video call, the GMSC 113 transmits the IAM transmitted from the MTG 105 to the MSC 111 (s307). (ISUP protocol)

Here, the case in which the WCDMA terminal 101 is a terminal for which video communication is normally impossible will be described in detail with reference to FIG. 5.

Next, the MSC 111 transmits a SETUP message for a signal connection request to the WCDMA terminal 101 (S308). (H.324M protocol)

Next, the WCDMA terminal 101 transmits an alerting message to the MSC 111 (s309). (H.324M protocol)

Next, the MSC 111 is connected to the line and sends the ACM to the GMSC 113 (s310). (ISUP protocol)

Next, the GMSC 113 transmits the ACM to the MTG 105 (s311). (ISUP protocol)

Next, the MTG 105 converts the ACM transmitted from the GMSC 113 into a 180 ringing message, and the WCDMA terminal 101 transmits a 180 ring message to the SSW-C4 121. (s312). (SIP protocol)

Next, the SSW-C4 121 transmits the 180 ring message transmitted from the MTG 105 to the SSW-C5 123 (S313). (SIP protocol)

Next, the SSW-C5 123 transmits the 180 ring message transmitted from the SSW-C4 121 to the VoIP terminal 109 (S314).

Next, when the user of the WCDMA terminal 101 receives a call, the WCDMA terminal 101 transmits a Connect message to the MSC 111 (S315). (H.324M protocol)

Next, the MSC 111 transmits an ANM indicating that the WCDMA terminal 101 has responded to the GMSC 113 (s316). (ISUP protocol)

Next, the GMSC 113 transmits the ANM transmitted from the MSC 111 to the MTG 105 (s317). (ISUP protocol)

Next, the MTG 105 converts the ANM transmitted from the GMSC 113 into a 200 OK message, and transmits the 200 OK message to the SSW-C4 121 (s318). (ISUP protocol)

Next, the SSW-C4 121 transmits a 200 OK message transmitted from the MTG 105 to the SSW-C5 123 (s319). (SIP protocol)

Next, the SSW-C5 123 transmits a 200 OK message to the VoIP terminal 109 (s320). (SIP protocol)

Next, the VoIP terminal 109 transmits an ACK message to the SSW-C5 123 as a response to the 200 OK message (s321). (SIP protocol)

Next, the SSW-C5 123 transmits the ACK message transmitted from the VoIP terminal 109 to the SSW-C4 121 (s322). (SIP protocol)

Next, the SSW-C4 121 transmits an ACK message transmitted from the SSW-C5 123 to the MTG 105 (S323). (SIP protocol)

Next, when the line is connected in step S301 to step S323, H.245 media negotiation is performed between the WCDMA terminal 101 and the MTG 105 (s324). (H.324M protocol)

Next, after the media negotiation is completed, voice and video data are transmitted between the WCDMA terminal 101 and the VoIP terminal 109 (s325).

Here, media is transmitted in a time division multiplexer (TDM) manner between the WCDMA terminal 101 and the MTG 105 (line section), and an RTP between the MTG 105 and the VoIP terminal 109 (IP section). Media is transmitted in a real-time transport protocol.

FIG. 4 is a case of VoIP origination and WCDMA reception, and is an embodiment flowchart showing a part of the interworking method when the WCDMA subscriber number is ported from 2G to 3G. The protocol described in FIG. ) Is illustrated as one embodiment.

In case of WCDMA subscriber number porting from 2G in domestic mobile telecommunications, the number of mobile phone numbering rules (Query on Release, QoR) is applied. QoR means that when an originating exchange transmits a signal requesting a ported number to a destination exchange (the destination exchange of a number porting operator), the destination exchange releases the transmitted signal and notifies the calling party of the cause of signal release. A method of obtaining information to be transmitted from a database to a new destination exchange (the recipient's destination exchange after number transfer).

Therefore, when the VoIP subscriber 109 makes a call to the WCDMA number mobile subscriber 101, the signal is not immediately connected but released (Release (Ported Out)}. Next, the VoIP network 107 queries the NPDB 125 to obtain number porting information, and makes a signal connection request to the destination exchange again.

As shown in FIG. 4, when the user of the VoIP terminal 109 first transmits a video signal to communicate with the WCDMA terminal 101, the VoIP terminal 109 transmits an INVITE message to the SSW-C5 123. In addition, the SSW-C5 123 transmits an INVITE message to the SSW-C4 121 using a prefix / postfix transmitted from the VoIP terminal 109 (s401).

Next, the SSW-C4 121 transmits an INVITE message transmitted from the SSW-C5 123 to the MTG 105 (S402).

Next, the MTG 105 converts the INVITE message transmitted from the SSW-C4 121 into IAM, and transmits the IAM to the GMSC 113 (s403).

Next, the GMSC 113 transmits a Location Request (LOR) message to the HLR 115 to obtain subscriber information on the called number (s404).

Next, the HLR 115 transmits a LOR ACK (Location Request Acknowledge) message including subscriber information to the GMSC 113 (s405). The LOR ACK message includes information indicating whether or not the WCDMA subscriber ported from 2G.

Next, when the GMSC 113 cannot normally make a video call with the WCDMA terminal 101, the GMSC 113 transmits a release (Release, REL) message to the MTG 105 (s406). The REL message includes a cause for the call unavailable.

Next, the MTG 105 transmits a 30X message to the SSW-C4 121 when the cause value of the REL message is ported-out by number porting (s407). The 30X message is a Redirect message, which is generated when using a SIP Redirect server. When a call is requested from UAC, the SIP Redirect server informs the address of the UAS, which is the final destination. Accordingly, the SIP Redirect server transmits a Redirect message as a response to the client's INVITE message, and provides session information of the final destination client. The 30X message may be '301 Moved Permanently' or '302 Moved Temporarily' or may be defined as any message between operators.

Next, the SSW-C4 121 queries the NPDB 125 with number porting information when a 30X message is transmitted from the MTG 105 (s408).

Next, the NPDB 125 transmits an NPDB query result to the SSW-C4 121 (s409). The NPDB query result includes the virtual number generated by the number transfer of the called number.

Next, the SSW-C4 121 transmits an INVITE message to the MTG 105 using the NPDB query result (S410).

Next, the MTG 105 converts the INVITE message transmitted from the SSW-C4 121 into IAM, and transmits the IAM to the GMSC 113 (s411).

Next, the GMSC 113 transmits an LOR message to the HLR 115 to obtain subscriber information for the called number (S412). The LOR message includes the 3G virtual number of the number port subscriber.

Next, the HRL 115 transmits subscriber information to the GMSC 113 (s413).

Next, the GMSC 113 transmits an IAM for circuit connection to the MSC 111 using the transmitted subscriber information (S414).

After step s413, the method of interworking with the VoIP origination and the WCDMA call is the same as the steps s308 to s325.

FIG. 5 is a flowchart illustrating a method of connecting with a voice signal in case of VoIP origination and WCDMA reception, and in case of video signal connection failure, one protocol (for example, H.324M, etc.) described in FIG. It is illustrated as an example of.

Currently, the WCDMA terminal distinguishes between 2G and 3G networks, and thus, voice call buttons and video call buttons exist. When requesting a video call to the WCDMA terminal 101, if the other terminal is a 2G terminal or a terminal that does not support the video call, the video call connection is not made. In this case, the user must request a voice call again.

However, the VoIP terminal 109 negotiates voice and video media during SIP signaling in the IP network, and performs voice and video calls according to the negotiated result. That is, the VoIP terminal 109 may exist as one call button without distinguishing between the voice call button and the video call button. In this case, when the incoming WCDMA terminal 101 does not support a video call, a method for automatically connecting to a voice call in a VoIP network is required.

As illustrated in FIG. 5, the VoIP terminal 109 transmits an INVITE message for a video call request to the SSW-C5 123 (S501).

Next, the SSW-C5 123 transmits an INVITE message transmitted from the VoIP terminal 109 to the SSW-C4 121 (s502).

Next, the SSW-C4 121 transmits an INVITE message transmitted from the SSW-C5 123 to the MTG 105 (s503).

Next, the MTG 105 converts the INVITE message transmitted from the SSW-C4 121 into an IAM, and transmits the IAM to the GMSC 113 (s504).

Next, the GMSC 113 performs an inquiry to the HLR 115 for subscriber information confirmation (S505). In the HLR query process, it is checked whether the WCDMA terminal 101 is a terminal capable of a normal video call.

Next, when the WCDMA terminal 101 is a terminal that cannot normally video call, the GMSC 113 transmits a release message to the MTG 105 (s506).

Next, the MTG 105 transmits a 4XX message including the cause of the video call to the SSW-C4 121 (s507). The 4XX message sent to the SSW-C4 121 is transmitted to the SSW-C5 123 and the VoIP terminal 109. The 4XX message is defined between VoIP providers.

Next, if the cause of the video call failure is a terminal (eg, 2G terminal) that does not support the video, the SSW-C4 121 transmits an INVITE message back to a signaling gateway (SG) (s508). Here, SG is a gateway for converting a SIP message for a voice signal into an ISUP message and transmitting it to a public switched telephone network (PSTN).

Next, the SG converts the INVITE message transmitted from the SSW-C4 121 into IAM and transmits the same to the PSTN. Next, the voice signal is connected to the 2G terminal via the mobile phone switch through the PSTN.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a configuration diagram of a network system to which the present invention is applied and an embodiment of a VoIP network and a WCDMA network.

2 is a flowchart illustrating an interworking method in case of WCDMA origination and VoIP reception.

3 is a flowchart illustrating an interworking method in case of VoIP origination and WCDMA reception.

Figure 4 is a case of VoIP origination and WCDMA reception, and an embodiment flow diagram showing a part of the interworking method when the WCDMA subscriber number is ported from 2G to 3G.

FIG. 5 is a flowchart illustrating a method for connecting with a voice signal in case of VoIP origination and WCDMA reception, and in case of video signal connection failure. FIG.

Claims (28)

delete In the interworking method between the VoIP network and the WCDMA network, A message forwarding step of converting the video call request message from the VoIP network into an ISUP protocol message and delivering the message to the WCDMA network; A voice call call connection step of connecting a voice call call as the called WCDMA terminal is a video call impossible terminal; And Converting and transmitting a voice call signal between the originating terminal of the VoIP network and the called WCDMA terminal into a corresponding protocol message; The voice call call connection step, Checking, by the gateway mobile communication switching station, whether the incoming WCDMA terminal is a video call terminal through a home location register, and transmitting a video call failure message to the multimedia trunk gateway according to the terminal that is not capable of video call; Transmitting, by the multimedia trunk gateway, a message including a cause of video call impossibility to a second soft switch; Sending, by the second softswitch, a voice call request message to a signaling gateway; And Converting the voice call request message received by the signaling gateway into an initial address message (IAM) and transmitting the converted voice call request message to a public telephone network; Interworking method between a VoIP network and a WCDMA network comprising a. The method of claim 2, The message delivery step, Transmitting, by the originating terminal of the VoIP network, a video call request message to the multimedia trunk gateway through a first soft switch and the second soft switch; And Converting the video call request message received by the multimedia trunk gateway into an IAM and transmitting the converted video call request message to the gateway mobile communication switching center; Interworking method between a VoIP network and a WCDMA network comprising a. The method of claim 2 or 3, The video call request message and the voice call request message, An interworking method between a VoIP network and a WCDMA network, which is an INVITE message. The method of claim 2 or 3, The incoming WCDMA terminal, An interworking method between a VoIP network and a WCDMA network, wherein a voice call button and a video call button are distinguished. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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