KR100906952B1 - Rerouting method and system according to unsupproting video capacity of called terminal - Google Patents

Abstract

The present invention relates to a method and system for rerouting according to a video call between a mobile terminal and a VoIP terminal, which does not support the video capability of the called terminal or rejects the video call. According to an embodiment of the present invention, a method of rerouting according to an image support capability of a called terminal may include receiving an initial address message (IAM) from the mutual repeater according to a routing scheme of a mutual repeater, an inte corresponding to the initial address message. Sending a message to the called terminal, receiving a response message corresponding to the invite message from the called terminal, analyzing the response message, and the bearer capability of the called terminal is a video, and the video call response of the called terminal In this case, the method may include re-determining a routing scheme for the video call and performing routing according to the routing scheme.

Video call, video capability, routing, mobile terminal, VoIP terminal

Description

REROUTING METHOD AND SYSTEM ACCORDING TO UNSUPPROTING VIDEO CAPACITY OF CALLED TERMINAL}

1 is a diagram illustrating an overview of a rerouting method and system according to an unsupported receiver terminal video capability according to an embodiment of the present invention.

2 is a flowchart illustrating a rerouting method according to an unsupported receiver terminal video capability according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating call processing by a rerouting method according to an unsupported receiver terminal video capability according to an embodiment of the present invention.

4 is a flowchart illustrating a rerouting method according to an unsupported receiver terminal video capability according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating call processing by a rerouting method according to an unsupported receiver terminal video capability according to an embodiment of the present invention.

6 is a flowchart illustrating a rerouting method according to an unsupported receiver terminal video capability according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating a USSD message exposure screen for call back to a mobile terminal user according to one embodiment of the present invention.

FIG. 8 is a block diagram illustrating a rerouting system in which an incoming terminal video capability is not supported according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110: intelligent exchange equipment

111: VoIP terminal

120: mutual repeater

121: mobile terminal

140: video gateway

800: Rerouting system according to the video terminal's unsupported ability

The present invention relates to a method and a system for rerouting due to a rerouting issue of a called terminal in establishing a call between a mobile terminal and a VoIP terminal.

Recently, with the continuous evolution of communication networks, various wired / wireless communication networks such as mobile communication networks and VoIP networks, in addition to legacy communication networks such as conventional PSTN networks, have been provided. Due to the emergence of such various communication networks, the interworking between the respective communication networks is required, and there are various proposals for interworking for voice calls. In addition, due to the development of media and securing technology, video-based business is growing rapidly. Accordingly, various video calling methods for the video call are required, and in particular, a communication method for video call between different communication networks is required.

In response to such video demands, terminals capable of making video calls have recently been spread in various mobile networks, and various video terminals have also been spread in the mobile communication networks and VoIP networks. In addition, call setup and corresponding protocols for video calls among video terminals are widely spread.

However, there is a current shortage of related technologies in connection with the call setup control method and communication protocol development for the video call between the communication networks. Furthermore, since it is difficult to identify a terminal for a video call included in each network due to lack of technology for interworking with each other, there is a problem in that a smooth service cannot be provided in a video call between networks. In other words, when the calling terminal requests a call setup for a video call targeting the called terminal, when the called terminal is a terminal that is not capable of video calling, there is a problem because no processing method is provided.

That is, when a video call is not possible depending on the calling terminal and the called terminal, unless a method for re-determining a routing method for call processing is provided, a video call service between a plurality of communication networks cannot be performed smoothly. There is a problem.

The present invention has been made to solve the problems of the prior art as described above, according to a routing method determined as a call control from the mobile terminal to the destination terminal by a rerouting method and system according to the receiver terminal video capability not supported. Receive an initial address message (IAM) from a mutual relay, transmit an invite message corresponding to the initial address message to the called terminal, and then receive a predetermined response message from the called terminal, and receive the response. By re-determining the routing scheme reflecting the rerouting issue according to the called terminal by analyzing the message, and performing routing according to the routing scheme, an appropriate rerouting scheme occurs when a video call is not made by the called terminal. To bring the user back To provide you with the opportunity to automatically redial the request of the user can be a voice call is possible.

In order to achieve the above object and solve the above-mentioned problems of the prior art, the rerouting method according to the non-supporting terminal terminal video capability according to the first embodiment of the present invention is determined as a call control from the mobile terminal to the destination terminal. Receiving an initial address message (IAM) from a mutual relay according to a routing scheme, transmitting an invite message corresponding to the initial address message to the called terminal, and then receiving a predetermined response message from the called terminal Receiving, analyzing the response message, re-determining a routing scheme reflecting a rerouting issue according to the called terminal, and performing routing according to the routing scheme.

According to one aspect of the present invention, the step of re-determining the routing scheme reflecting the rerouting issue according to the destination terminal by analyzing the response message to analyze the response message according to the bearer capability and the video call response of the called terminal Re-determining the routing scheme.

According to another aspect of the present invention, the step of re-determining the routing scheme according to the bearer capability of the called terminal and the rejection of the video call may include analyzing the response message to determine whether the bearer capability of the called terminal is video. And when the bearer capability of the called terminal is an image, determining whether the called terminal responds to a video call by analyzing the response message, and as a result of the determination, the bearer capability of the called terminal is an image and If there is a video call response, re-determining a routing scheme for a video call between the mobile terminal and the called terminal and the determination result indicates that the bearer capability of the called terminal is voice or the video call response of the called terminal is If not, the agreed reason code is Re-determining the routing scheme to transmit to the late stage.

According to another aspect of the present invention, if it is determined that the bearer capability of the called terminal is voice or there is no video call response of the mobile terminal, routing to transmit a predetermined reason code to the mobile terminal. The step of re-determining the method transmits the reason code to the mutual repeater, the mutual repeater sends the received reason code to a mobile exchange, and the mobile exchange sends a USSD message corresponding to the received reason code. Re-determining a routing scheme to transmit a message to the mobile terminal.

In the second embodiment of the present invention, the rerouting method according to the unsupported terminal video capability is an initial address message (IAM) from the video gateway according to a predetermined routing scheme as call control from the VoIP terminal to the called terminal. Receiving a message, transmitting a request message (LOR: Letter Of Request) corresponding to the initial address message to a home location register associated with the called terminal, and receiving a predetermined response message from the home location register; Re-determining a routing scheme reflecting the rerouting issue according to the called terminal by analyzing the response message, and performing routing according to the routing scheme.

In the first embodiment of the present invention, a rerouting system that does not support the called terminal video capability is an initial address message (IAM) from the mutual relay according to a predetermined routing scheme as call control from the mobile terminal to the called terminal. Receiving unit for receiving a message, the sender and the receiver receiving a response message from the destination terminal after transmitting the invite message corresponding to the initial address message, the re-routing issue according to the receiver terminal by analyzing the response message And a re-determining unit for re-determining the reflected routing scheme and an performing unit for performing routing according to the routing scheme.

In a second embodiment of the present invention, a rerouting system that does not support the called terminal video capability is an initial address message (IAM) from the video gateway according to a predetermined routing scheme as call control from the VoIP terminal to the called terminal. ), A receiving unit for receiving a letter of request (LOR) corresponding to the initial address message to a home location register associated with the called terminal, and then receiving a predetermined response message from the home location register. And a re-determining unit for re-determining a routing scheme reflecting a re-routing issue according to the called terminal by analyzing the response message and a performing unit for performing routing according to the routing scheme.

Terminals widely used in the present specification is a code division multiplexing access (CDMA) module, a Bluetooth module, an infrared ray, such as a wired telephone, a personal digital assistant (PDA), a smart phone, a handheld PC, a mobile phone, and the like. A communication terminal equipped with a predetermined communication module such as a communication module (IrDA), a wired / wireless LAN card, and equipped with a predetermined microprocessor, has a predetermined computing power, and H.323, SIP, MGCP (Media Gateway Control Protocol), Megaco, etc. A generic term for IP terminals that support VoIP related protocols.

MSC (Mobile Switching Center) widely used herein is an example of a mobile switch that is the heart of a mobile communication system that controls the entire mobile network, IGS (Interconnection Gateway System) widely used in the present specification is between the different communication networks It may be an example of a mutual repeater to relay the connection of.

Soft switch (SSW) widely used in the present specification is an example of intelligent switching equipment that controls call processing and sessions in a VoIP network, and a video gateway (VG) widely used in the present specification is an IP packet network (VoIP, etc.). ) Is an example of a device that provides a PSTN / PLMN exchanger and a TDM-based physical video call path, and a widely used voice gateway (TG) is a PSTN exchanger and a TDM-based physical voice in a VoIP network. It may be an example of an apparatus for providing a call path.

Home location register (HLR) widely used herein may be an example of a mobile subscriber database having terminal information, subscription information, location information, authentication function, and the like in a wireless communication exchange.

The MSC, IGS, SSW, video gateway, voice gateway, and HLR are names used for easy understanding of the present invention. Accordingly, the invention is not to be construed as limited or limited to the present invention.

In addition, although the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, the present invention is not limited or restricted by the embodiments.

1 is a diagram illustrating an overview of a rerouting method and system according to an unsupported receiver terminal video capability according to an embodiment of the present invention.

As shown, the mobile terminal 121 that can be connected to the mobile network and the VoIP terminal that can be connected to the VoIP network determine a routing scheme for video calls and routing is performed according to the routing scheme, the called terminal According to the re-routing system according to the routing method is performed according to a predetermined routing scheme for a video call, when the called terminal is a terminal that can not be a video call, or when the called terminal rejects a video call, It may provide information for a call back (Fall Back), and automatically re-determine the routing scheme for the voice call in accordance with the user's request to re-send, and may provide a service in which routing is performed according to the re-determined routing scheme.

The rerouting method according to the called terminal requires interworking between a mobile network, a VoIP network, and a PSTN network. The VoIP network is a data service packet network that has been used in the past for an Internet phone, and is a communication service network that enables a call in a general telephone network by converting video / audio data into Internet protocol data packets. The user may receive a communication service through the video / audio VoIP terminal 111 connected to the VoIP network.

The mobile network is connected to a mobile terminal 121 such as a 3G terminal and a 2G terminal including a 3G-324M terminal, and the user can receive a circuit-based wireless mobile communication service through the mobile network. The PSTN network is a public telephone switching network operated by a public telecommunication service provider, and may enable voice calls between the VoIP network and the mobile network through interworking with the VoIP network and the mobile network.

The rerouting method according to the called terminal may be performed through any one of the video gateway 140 and the mutual relay 120. In the case of the rerouting method according to the called terminal using the mobile terminal 121 as the calling terminal and the VoIP terminal 111 as the called terminal, the rerouting is performed using the video gateway 140 as the rerouting system according to the called terminal. In the case of the rerouting method according to the called terminal having the VoIP terminal 111 as the calling terminal and the mobile terminal 120 as the called terminal, the mutual repeater 120 is used as the rerouting system according to the called terminal. Rerouting can be done.

The VoIP network is a packet-based communication network, and the mobile network and the PSTN network are circuit-based communication networks. A gateway is needed between a packet network and a circuit network having different types of transmission signals so that two different networks can be mutually converted to transmit information. The rerouting method according to the called terminal according to the present invention may include a video gateway 140 and a voice gateway 150 for compatibility between the packet network and the circuit network. In particular, the video gateway 140 may operate as a compatible device for video telephony between the packet network and the circuit network, and the video gateway 140 may include a call control signal mapping unit, a bearer control signal mapping unit, and a media mapping unit. It may include.

In connection with a circuit network including a repeater 120, the call control signal mapping unit may use H.323 and session initiation protocol (SIP), and the bearer control signal mapping unit is H.245 and SIP (SDP). ) And the media mapping unit may use IP Stream (RTP / RTCP). In addition, in connection with a packet network including the intelligent switching equipment 110, the call control signal mapping unit may use ISUP and Q.931, the bearer control signal mapping unit may use H.245 / H223 The media mapping unit may use a TDM stream (H.223 MUX).

The H.323 and SIP may be a signaling protocol of an application layer in which intelligent terminals to communicate on a communication network identify each other, find a location thereof, and specify a procedure for creating or deleting a multimedia communication session with each other. ISUP means the user part of the ITU-T NO.7 signaling method considering the correspondence of various services of the integrated information communication network (ISDN), and Q.931 refers to the ITU-T that defines the call setup procedure in the ISDN user-network interface. It may be a recommendation. In addition, the H.245 and SIP (SDP) may be one of the protocols used in the circuit network, H.245 / H223 in the packet network. The exchange 130 may control the connection between the PSTN network and the rerouting system according to the called terminal.

The rerouting method according to the called terminal according to the present invention performed according to the rerouting method decision between the mobile terminal and the VoIP terminal may be divided into three embodiments as follows.

1) By analyzing the response message received from the called terminal with the calling terminal as the mobile terminal and the called terminal as the VoIP terminal, the routing scheme reflecting the rerouting issue according to the called terminal is re-determined and the rerouted routing is determined. A first embodiment for performing routing according to the scheme.

2) By analyzing the response message received from the home location register using the calling terminal as the VoIP terminal and the called terminal as the mobile terminal, the routing scheme reflecting the rerouting issue according to the called terminal is re-determined and the rerouted routing is determined. Embodiment 2-1 performing routing according to the scheme.

3) The routing scheme reflecting the rerouting issue according to the called terminal is analyzed by analyzing the response information received from the home location register and the terminal information extracted from the subscriber database using the calling terminal as the VoIP terminal and the called terminal as the mobile terminal. Embodiment 2-2, re-determining and performing routing according to the re-determined routing scheme;

As described above, the rerouting method according to the receiver terminal video capability not supported according to the present invention can be divided into each embodiment. Hereinafter, a method and a system for rerouting according to the video terminal not supporting the called terminal according to each embodiment will be described in more detail with reference to FIGS. 2 to 8.

FIG. 2 is a flowchart illustrating a rerouting method according to an unsupported receiver terminal video capability according to the first embodiment of the present invention.

The rerouting method according to the first terminal of the present invention, which does not support the video capability, may be performed using the calling terminal as the mobile terminal and the called terminal as the VoIP terminal. The rerouting method according to the called terminal may be performed in steps 201 to 215.

In step 201, the mutual relay receives the initial address message corresponding to the call setup message SETUP transmitted by the mobile terminal to the mobile terminal to the called terminal from the mobile switch, and routes the initial address message. You can decide how. The mobile switching center is the heart of the mobile communication system that controls the entire mobile network. The mobile switching center handles signals from and to each mobile phone base station, and provides a central control function for adjusting the mobile phone base station to operate efficiently. Can be. The mutual repeater may serve to relay a connection between the mobile network including the mobile terminal and the VoIP network including the called terminal, and the first routing before re-determining routing in the rerouting system according to the called terminal. It can play a role in determining.

The called terminal may include a VoIP terminal, which means a communication terminal used in a VoIP network. VoIP is a communication technology capable of making calls over the Internet, and uses a packet network for data communication, which has been used in the past, for Internet phones. A communication service technology that converts voice data into Internet protocol data packets to enable communication over a general telephone network. The VoIP network is a communication network including equipment and terminals for providing such a VoIP service, and protocols used in the VoIP network may include H.323, SIP, MGCP, and MEGACO. In addition, the VoIP network may be used as a concept including a wired network and a wireless network. A terminal used in a VoIP network is called a VoIP terminal, and the VoIP terminal includes a wired terminal including an H.323 / SIP video terminal and a SIP / H. A wireless terminal including a 323 video terminal may be included.

  In step 202, the mutual repeater analyzes the initial address message received from the mobile switch in the routing method of the initial address message, and determines whether the bearer capability of the mobile terminal is video / audio. If the bearer capability of the terminal is a video, a routing scheme is determined to transmit the initial address message, and if the bearer capability of the mobile terminal is voice as a result of the determination, for a voice call between the mobile terminal and the called terminal The routing scheme can be determined.

The mobile terminal may include a 2G terminal and a 3G terminal, and the mutual repeater may determine the routing method by analyzing an initial address message received from the mobile terminal. The 3G terminal is an International Telecommunication Union (ITU) standard applied to 3G devices in the development of mobile communication, and has appeared since the 1st generation of analog cellular phones and the 2nd generation of digital PCS phones. In the 3G, the transmission speed is much faster than that of the existing 2G, and the video can be exchanged. Accordingly, various color contents such as music videos, internet broadcasts, and news may be provided, and further, video call services may be supported.

The initial address message (IAM) is a predetermined call signal received from the mobile terminal, and may include bearer capability information of the mobile terminal and various information about the called terminal. In addition, the initial address message is a kind of ISUP message and may include a number and various information necessary for call processing and routing. Also, the initial address message may be a call request message of a mobile network associated with the mobile terminal. The bearer capability information may determine whether the mobile terminal, which is the originating terminal, is a 3G terminal capable of a video call or a 2G terminal capable of a video call.

The mutual repeater determines the bearer capability of the mobile terminal, and if the bearer capability is an image, transmits the initial address message to a rerouting system according to the called terminal to perform step 203, and the bearer If the capability is voice, then step 213 of determining a routing scheme for a voice call may be performed.

In step 203, the rerouting system may receive an initial address message (IAM) from the mutual relay according to the routing scheme of the mutual relay. At this time, the initial address message is received for the call setup from the mobile terminal to the destination terminal, the routing scheme is a routing scheme determined by the mutual repeater in step 202, the bearer capability of the mobile terminal is an image In this case, the routing method is determined.

In step 204, the rerouting system transmits an invite message corresponding to an initial address message to the called terminal, and then receives a predetermined response message from the called terminal, and receives an invite message with the called terminal. And in the transmission and reception of the response message, via the intelligent switching equipment. The predetermined response message may include an 18X (SDP) message. The SDP (Service Discovery Protocol) is a message that may include bearer capability information of the VoIP terminal in the VoIP network, and further, when the user of the VoIP terminal rejects the video call, includes the information according to the rejection. can do. The invite message may be a call request message of a called network associated with the called terminal, and the response message may be a call response message of the called network.

The intelligent switching equipment is a software-centric intelligent switching equipment that controls call processing by media gateways that bridge the circuit network including the mobile network and the packet network including the VoIP network, and provides a packet-based IP service. It can be used as a decentralized switching / control platform for circuit-to-packet call processing conversion, and the video gateway is an image between the VoIP network and the mobile network which are divided into a circuit network and a packet network as described above. You can perform signal conversion connections.

In step 205, the rerouting system may determine whether the bearer capability of the called terminal is an image by analyzing the response message. The rerouting system may re-determine a routing scheme reflecting a rerouting issue according to the called terminal by analyzing the response message.

The rerouting issue may refer to an issue in which the called terminal is unable to make a video call or rejects the video call in response to the invite message sent for the video call to the called terminal.

The rerouting system may re-determine the routing scheme according to the bearer capability of the called terminal and whether the video call is answered by analyzing the response message.

 Since the response message includes bearer information of the called terminal, the response message is analyzed to determine whether the bearer capability of the called terminal is an image, and if the bearer capability of the called terminal is an image, the determination result. If it is determined that the bearer capability of the called terminal is voice, step 210 may be performed.

In step 206, the rerouting system analyzes the response message to determine whether the called terminal has a video call response, and may perform step 206 when there is a video call response of the called terminal. If there is no video call response, step 210 may be performed. The answer of the video call is related to whether or not a video call is desired from the called terminal to the mobile terminal. In other words, it means whether the called terminal user has rejected the video call.

In steps 207 to 209, the rerouting system may re-determine a routing scheme for video call between the mobile terminal and the called terminal, and perform routing according to the re-determined routing scheme. After completing the call setup according to the call channel can be set for the video call. The re-determined routing scheme may be routing in the same path as the routing scheme determined in the mutual relay. In other words, when the bearer capability of the mobile terminal is a video, the mutual repeater determines a routing scheme to enable a video call with the called terminal. However, from another point of view, since there is an additional determination process in the routing process according to the routing method determined in the mutual relay, it may mean re-determined routing.

In steps 210 to 211, if the bearer capability of the called terminal is voice or there is no video call response from the called terminal, the rerouting system sends a predetermined reason code to the mobile terminal. The routing scheme may be re-determined to transmit the data, and routing may be performed according to the determined routing scheme. The reason code means a predetermined information code for each when the bearer capability of the called terminal is a video or the called terminal does not want a video call.

Further, the rerouting system re-determines a routing scheme to send the reason code to the mutual repeater, the mutual repeater sends the received reason code to a mobile exchange, and the mobile exchange corresponds to the received reason code. The USSD message may be transmitted to the mobile terminal. The unstructured supplementary services data (USSD) message is used as a means for transmitting specific information or a specific command on a network. Unlike the SMS message, the USSD message is not a store-and-forward method but a communication path setting release method like a data service, and a document length can be up to 182 characters. The USSD message may include a video call impossible message and a call back request message of the called terminal. That is, the mobile terminal may expose a video call impossible message through the USSD message, and may expose a redial request message, which is a form of inquiring whether the mobile terminal user re-sends.

In step 212, the mobile terminal exposes the received USSD message, and if the mutual repeater receives a voice mode call setup message (SETUP) according to a call back from the mobile terminal, step 213 is performed. Can be done.

In step 213, the mutual repeater automatically determines a routing scheme for a voice call between the mobile terminal and the called terminal, performs routing in accordance with the determined routing scheme in step 214, and After the call setup is completed, a call channel for voice call may be allocated 215. That is, when the voice mode call setup message is received from the mobile terminal according to the redial, the routing scheme for the voice call with the called terminal is automatically determined. The voice mode call setup message may be previously agreed upon in response to the redial.

If the bearer capability of the mobile terminal is voice in step 202, the mutual repeater automatically determines a routing scheme for voice call between the mobile terminal and the called terminal in step 213, and In 214, the call channel for voice call may be allocated 215 after performing routing according to the determined routing scheme and completing call setup according to the routing.

In the plurality of cases described above, call processing according to the routing will be described in more detail with reference to FIG. 3.

FIG. 3 is a diagram illustrating call processing by a rerouting method in accordance with a non-supporting destination terminal video capability according to the first embodiment of the present invention.

As shown, call processing by the rerouting method may be performed in steps 301 to 304.

In step 301, the mobile terminal sends a call setup message (SETUP) to a mobile switch center (MSC) and the mobile switch (MSC) sends an initial address message (IAM) corresponding to the received call setup message to the mutual relay. Send to (IGS). The mutual repeater analyzes the received initial address message, determines whether the bearer capability of the mobile terminal is an image, and transmits an initial address message to the rerouting system when the bearer capability of the mobile terminal is an image, and If the bearer capability of the mobile terminal is voice, the routing scheme for the voice call is determined to perform routing for the voice call in step 304.

In step 301, the rerouting system receiving the initial address message from the mutual relay transmits the invite message to the intelligent exchange equipment, and the intelligent exchange equipment receiving the invite message receives the invite message. Send to the incoming (VoIP) terminal. The called terminal receiving the invite message transmits a response (18X) message corresponding to the invite message to the intelligent switching equipment, and the intelligent switching equipment reroutes the response message received from the called terminal. Send to the system. The rerouting system analyzes the received response message, determines whether there is a rerouting issue of the called terminal, and if there is a rerouting issue at the called terminal, transmits a REL procedure (Reason Code) through step 303. Re-determine the routing scheme to make), and if there is no re-routing issue in the called terminal, the routing scheme is determined to make the video call through step 302.

In step 302, if there is no rerouting issue in the called terminal, the rerouting system transmits an address complete message (ACM) and an address response message (ANM) to the mutual repeater. The repeater transmits the received address complete message and address response message to the mobile exchange, and the mobile exchange receiving the address complete message and address response message sends an Alert message corresponding to the address complete message to the mobile terminal and the message. The CONNECT message corresponding to the address response message is transmitted, and the mobile terminal receiving the CONNECT message transmits a CONNECT response message corresponding to the CONNECT message to the mobile exchange. After transmission of the CONNECT response message, a call channel is allocated between the mobile terminal and the called terminal and video call is started.

In the video call, a video call may be made through a TDM stream (H.223 MUX) in a mobile network including the mobile terminal, and an IP stream (RTP / RTCP) may be performed in a VoIP network including a called terminal. Through video call can be made. TDM time division multiplexing means that several low-speed subchannels share one high-speed transmission line by dividing the data transmission time of one transmission line by a predetermined time interval, and the Real-time Transport Protocol (RTP) Transport layer communication protocol for transmitting and receiving voice and video calls in real time, and Real-time Transport Control Protocol (RTCP) is a protocol used together to maintain the QoS of RTP.

In step 303, the rerouting system transmits a reason code to the mutual relay, and the mutual repeater receiving the reason code transmits the reason code to the mobile exchange, and receives the reason code. Sends a USSD message to the mobile terminal. The mobile terminal receiving the USSD message transmits a call setup message in a voice mode to the mobile switcher when a request for redialing is received from the user after providing information for a call back to the mobile terminal user. The mobile exchange receiving the call setup message transmits an initial address message corresponding to the call setup message to the mutual relay.

In step 304, the mutual repeater performs routing according to the routing method determined for the voice call in steps 301 and 303 to allocate a channel for voice call, and between the mobile terminal and the called terminal. Start a voice call. In the voice call, a video call may be made through a TDM stream (H.223 MUX) in a mobile network including the mobile terminal, and an IP stream (RTP / RTCP) may be performed in a VoIP network including a called terminal. Through video call can be made.

FIG. 4 is a flowchart illustrating a rerouting method according to an embodiment of the present invention, which does not support the receiver terminal video capability. The rerouting method according to the second terminal of the present invention, which does not support the video capability, may be performed using the calling terminal as the VoIP terminal and the called terminal as the mobile terminal. The rerouting method according to the called terminal may be performed in steps 401 to 415.

In step 401, the intelligent switching equipment may receive an INVITE message for the called terminal from the VoIP terminal and analyze the invite message to determine a routing method of the invite message. The called terminal may include a mobile terminal, and the mobile terminal may mean a communication terminal used in a mobile network, and may include a 3G terminal and a 2G terminal.

In step 402, the intelligent exchange equipment analyzes the invite message to determine whether the bearer capability of the VoIP terminal is a video / voice, and if the bearer capability of the VoIP terminal is a video, the video gateway. Determine a routing scheme to transmit the initial address message corresponding to the invite message, and if the bearer capability of the VoIP terminal is voice, routing for a voice call between the VoIP terminal and the called terminal. You can decide how.

The intelligent switching equipment may determine the routing scheme by analyzing the initial address message received from the mobile terminal. The VoIP terminal refers to a communication terminal used in the VoIP network. VoIP is a communication technology capable of making calls over the Internet, and uses a packet network for data communication, which has been used in the past, for Internet phones. A communication service technology that converts voice data into Internet protocol data packets to enable communication over a general telephone network. The VoIP network is a communication network including equipment and terminals for providing such a VoIP service, and protocols used in the VoIP network may include H.323, SIP, MGCP, and MEGACO. In addition, the VoIP network may be used as a concept including a wired network and a wireless network. A terminal used in a VoIP network is called a VoIP terminal, and the VoIP terminal includes a wired terminal including an H.323 / SIP video terminal and a SIP / H. A wireless terminal including a 323 video terminal may be included.

The intelligent switching equipment is a software-centric intelligent switching equipment that controls call processing by media gateways that bridge the circuit network including the mobile network and the packet network including the VoIP network, and provides a packet-based IP service. It can be used as a decentralized switching / control platform for circuit-to-packet call processing conversion, and the video gateway is an image between the VoIP network and the mobile network which are divided into a circuit network and a packet network as described above. You can perform signal conversion connections.

The INVITE message is a predetermined outgoing signal received from the VoIP terminal, and may include bearer capability information of the VoIP terminal and various information about the called terminal. In addition, the invite message may be a call request message of a VoIP network associated with the VoIP terminal. The bearer capability information may determine whether the VoIP terminal, which is the originating terminal, is a terminal capable of a video call or a terminal that is not capable of a video call.

The intelligent switching equipment determines the bearer capability of the VoIP terminal, and when the bearer capability is a video, transmits the invite message to an image gateway to perform step 403, and when the bearer capability is voice. In operation 413, the routing scheme for the voice call may be determined.

In step 403, the rerouting system may receive an initial address message (IAM) from the video gateway according to the routing scheme of the intelligent switching equipment. At this time, the initial address message is received for the call setup from the VoIP terminal to the destination terminal, and the routing scheme is a routing scheme determined by the intelligent switching equipment in step 402, wherein the bearer capability of the mobile terminal is displayed. In this case, the routing scheme is determined. The video gateway may transmit the initial address message corresponding to the invite message received from the intelligent switching device. As described above, the video gateway may perform a video signal conversion connection between the VoIP network and the mobile network which are divided into a circuit network and a packet network.

In step 404, the rerouting system may transmit a request message corresponding to the initial address message to a home location register associated with the called terminal, and receive a predetermined response message from the home location register. The home location register may transmit a pseudorandom noise (PRN) message corresponding to the received request message to the mobile exchange, and receive a pseudo random number response message for the pseudo random number message from the mobile exchange. The predetermined response message may include a Letter Of Request (LOR) message. The pseudo random number message and the LOR message may be used as a control signal for call establishment in a mobile network. The initial address message may be a call request message of a called network associated with the called terminal, the request message may be an information request message of the called network, and the response message may be an information response message of the called network. At this time, the called network may be a VoIP network.

In step 405, the rerouting system may analyze the response message to determine whether the bearer capability of the called terminal is an image. The rerouting system may re-determine a routing scheme reflecting a rerouting issue according to the called terminal by analyzing the response message.

The rerouting issue may refer to an issue in which the called terminal is unable to make a video call or rejects the video call in response to a predetermined request message sent for the video call to the called terminal. .

The rerouting system may re-determine the routing scheme according to the bearer capability of the called terminal and whether the video call is answered by analyzing the response message.

 Since the response message includes bearer information of the called terminal, the response message is analyzed to determine whether the bearer capability of the called terminal is an image, and if the bearer capability of the called terminal is an image, the determination result. In operation 406, if the bearer capability of the called terminal is voice, the operation 410 may be performed.

In step 406, the rerouting system analyzes the response message to determine whether the called terminal has a video call response, and may perform step 406 when there is a video call response of the called terminal. If there is no video call response, step 410 may be performed. The answer of the video call is related to whether or not a video call is desired from the called terminal to the mobile terminal. In other words, it means whether the called terminal user has rejected the video call.

In steps 407 to 409, the rerouting system may re-determine a routing scheme for video call between the VoIP terminal and the called terminal, and perform routing according to the re-determined routing scheme. After completing the call setup according to the call channel can be set for the video call. The re-determined routing scheme may be routing along the same path as the predetermined routing scheme in the intelligent switching equipment. In other words, when the bearer capability of the mobile terminal is a video, the intelligent switching device determines a routing scheme to enable a video call with the called terminal. However, from another point of view, since there is an additional determination process in the routing process according to the routing scheme determined by the intelligent switching equipment, it may mean re-determined routing.

In steps 410 to 411, if the bearer capability of the called terminal is voice or there is no video call response from the called terminal, the rerouting system sends a predetermined reason code to the VoIP terminal. The routing scheme may be re-determined to transmit the data, and routing may be performed according to the determined routing scheme. The reason code means a predetermined information code for each when the bearer capability of the called terminal is a video or the called terminal does not want a video call.

Further, the rerouting system transmits the reason code to the video gateway, the video gateway transmits the received reason code to the intelligent switching device, and the intelligent switching device sends the received reason code to the VoIP terminal. can do.

In step 412, the VoIP terminal exposes a Call Back message corresponding to the received reason code, and the voice mode inv (INVITE) according to the call back from the VoIP terminal by the intelligent switching equipment. If a message is received, step 413 may be performed.

In step 413, the intelligent switching equipment automatically determines a routing scheme for voice call between the VoIP terminal and the called terminal, performs routing in accordance with the determined routing scheme in step 414, and After the call setup is completed, a call channel for voice call may be allocated (415). That is, when the voice mode call setup message is received from the VoIP terminal according to the redial, the routing method for the voice call with the called terminal is automatically determined. The voice mode call setup message may be previously agreed upon in response to the redial.

If the bearer capability of the VoIP terminal is voice in step 402, the intelligent switching equipment automatically determines a routing scheme for voice call between the VoIP terminal and the called terminal in step 413, In operation 414, the call channel for the voice call may be allocated after performing the routing according to the determined routing scheme and completing the call setup according to the routing. The called terminal may include a mobile terminal.

In the plurality of cases described above, call processing according to the routing will be described in more detail with reference to FIG. 5.

FIG. 5 is a diagram illustrating call processing by a re-routing method in accordance with 2-1 of the present invention, which does not support the called terminal video capability.

As shown, call processing by the rerouting method may be performed in steps 501 to 504.

In step 501, the VoIP terminal transmits an INVITE message to the intelligent exchange device, and the intelligent exchange device analyzes the received invite message to determine whether the bearer capability of the VoIP terminal is a video. When the bearer capability of the VoIP terminal is a video, the invite message is transmitted to a video gateway, and when the bearer capability of the mobile terminal is voice, a routing scheme for a voice call is determined and the routing for the voice call is performed in step 504. Do this.

In step 501, the video gateway receiving the invite message from the intelligent switching device transmits the received invite message to the rerouting system. The rerouting system receiving the invite message from the video gateway transmits a letter of request (LOR) to a home location register, and the home location register receiving the request message has a PRN corresponding to the request message. Send a message to the mobile exchange. The mobile exchange sends a PRN response message to the home location register in response to the received PRN message, and the home location register sends a response message corresponding to the received PRN response message to the rerouting system. The rerouting system analyzes the received response message, determines whether there is a rerouting issue of the called terminal, and if there is a rerouting issue at the called terminal, transmits a REL procedure (Reason Code) through step 503. Re-determining the routing scheme to make), and if there is no re-routing issue in the called terminal, the routing scheme is determined to make the video call through step 502.

In step 502, the rerouting system sends an initial address message to the mobile exchange if there is no rerouting issue at the destination terminal, and the mobile exchange sends a PAGING message, a SETUP message and a CONNECT corresponding to the initial address message. The mobile terminal transmits a PAGING response message, a CALL COMFIRMED message, an ALERT message, and a CONNECT response message corresponding to the received PAGING message, SETUP message, and CONNECT message to the mobile exchange.

The mobile exchange sends an address complete message (ACM) and an address response message (ANM) to the rerouting system in response to the received CONNECT response message, and the rerouting system sends the received address. Sends a completion message and an address response message to the video gateway, and the video gateway sends an 18X (SDP) message and a 200 OK message corresponding to the received address completion message and address response message to the intelligent switching device, and The intelligent switching equipment sends the received 18X (SDP) message and the 200 OK message to the VoIP terminal. The VoIP terminal transmits an ACK message to the intelligent switching device in response to the 18X (SDP) message and the 200 OK message, and the intelligent switching device receiving the ACK message transmits the ACK message to the video gateway. After the transmission of the ACK message, a call channel is allocated between the VoIP terminal and the called (mobile) terminal and a video call is started.

In the video call, a video call can be made through a TDM stream (H.223 MUX) in a mobile network including the mobile (receive) terminal, and an IP stream (RTP / Video call can be made through RTCP). TDM time division multiplexing means that several low-speed subchannels share one high-speed transmission line by dividing the data transmission time of one transmission line by a predetermined time interval, and the Real-time Transport Protocol (RTP) Transport layer communication protocol for transmitting and receiving voice and video calls in real time, and Real-time Transport Control Protocol (RTCP) is a protocol used together to maintain the QoS of RTP.

In step 503, the rerouting system transmits a reason code to the video gateway, and the video gateway receiving the reason code transmits the reason code to the intelligent switching equipment and receives the reason code. The switching equipment sends the reason code to the VoIP terminal. The VoIP terminal, having received the reason code, provides information for a call back to the VoIP terminal user and then, upon receiving a redial request from the user, exchanges the call setup message (INVITE) according to the voice mode. Send to the equipment.

In step 504, the mutual repeater performs routing according to the routing method determined for voice call in steps 501 and 503 to allocate a channel for voice call, and between the VoIP terminal and the called terminal. Start a voice call. In the voice call, a video call can be made through a TDM stream (H.223 MUX) in a mobile network including the called terminal, and an IP stream (RTP / RTCP) in a VoIP network including an originating terminal. Through video call can be made.

FIG. 6 is a flowchart illustrating a rerouting method according to non-support of called terminal video capability in embodiment 2-2 of the present invention.

In the second embodiment of the present invention, the rerouting method according to the non-supporting of the terminal terminal video capability may be performed using the calling terminal as the VoIP terminal and the called terminal as the mobile terminal. The rerouting method according to the called terminal may be performed in steps 601 to 616.

As shown, steps 601 to 603 are performed to be the same as steps 601 to 603 of FIG. 4 discussed above, and steps 607 to 615 of FIG. 4 discussed above. Steps 607 to 615 may be performed in the same manner. Therefore, the differences from the rerouting method according to the embodiment 2-1 will be described.

In step 616, the rerouting system may extract the terminal information of the called terminal from the called network subscriber database using the linkage with the subscriber database. The subscriber database may be included in the called network as a database including terminal information of the called (mobile) terminal.

In step 604, the rerouting system may transmit a request message corresponding to the initial address message to a home location register associated with the called terminal, and then receive a predetermined response message from the home location register. The home location register may transmit a pseudorandom noise (PRN) message corresponding to the received request message to the mobile exchange, and receive a pseudo random number response message for the pseudo random number message from the mobile exchange. The predetermined response message may include a Letter Of Request (LOR) message. The pseudo random number message and the LOR message may be used as a control signal for call establishment in a mobile network.

In step 605, the rerouting system may determine whether the bearer capability of the called terminal is an image with reference to the terminal information. The rerouting system may re-determine a routing scheme reflecting a rerouting issue according to the called terminal by analyzing the response message.

The rerouting issue may refer to an issue in which the called terminal is unable to make a video call or rejects the video call in response to a predetermined request message sent for the video call to the called terminal. .

The rerouting system may re-determine the routing scheme according to the bearer capability of the called terminal and whether the video call is answered by analyzing the response message.

 Since the response message includes bearer information of the called terminal, the response message is analyzed to determine whether the bearer capability of the called terminal is an image, and if the bearer capability of the called terminal is an image, the determination result. In operation 606, if the bearer capability of the called terminal is voice, the operation 610 may be performed.

In step 606, the rerouting system analyzes the response message to determine whether the called terminal has a video call response, and may perform step 606 when there is a video call response of the called terminal. If there is no video call response, step 610 may be performed. The answer of the video call is related to whether or not a video call is desired from the called terminal to the mobile terminal. In other words, it means whether the called terminal user has rejected the video call.

FIG. 7 is a diagram illustrating a USSD message exposure screen for call back to a mobile terminal user according to one embodiment of the present invention.

By analyzing the response message received from the called terminal using the calling terminal as the mobile terminal and the called terminal as the VoIP terminal, the routing method reflecting the rerouting issue according to the called terminal is re-determined and the determined routing method is determined. In the first embodiment of performing routing according to the above, the mobile terminal receives the USSD message corresponding to the reason code from the mobile switch because the destination terminal reflects a rerouting issue. When received, the USSD message may be exposed to the mobile terminal user, and may wait to receive an input of the user's redial request. The USSD message may include a video call impossible message and a redial request message.

By analyzing the response message received from the home location register associated with the called terminal with the calling terminal as the VoIP terminal and the called terminal as the mobile terminal, the routing scheme reflecting the rerouting issue according to the called terminal is re-determined. In a second embodiment of performing routing according to a re-determined routing scheme, the VoIP terminal may expose the redial code corresponding to the reason code to the VoIP terminal user, and receive the redial request of the user. I can wait. The redial message may include a video call impossible message and a redial request message.

FIG. 8 is a block diagram illustrating a rerouting system in which a receiver terminal video capability is not supported in the first embodiment of the present invention. As shown in FIG. 8, the rerouting system 800 according to the receiver terminal video capability not supported may include a receiver 801, a transceiver 802, a re-determiner 803, and a performer 804.

The receiver 801 may receive an initial address message (IAM) from a mutual repeater according to a predetermined routing scheme as a call control from a mobile terminal to a called terminal. The transceiver 802 may receive an invite message corresponding to the initial address message to the called terminal, and then receive a response message from the called terminal. The re-determining unit 803 may analyze the response message to receive a re-determining the routing method reflecting the rerouting issue according to the called terminal, and the execution unit 804 may perform the routing according to the routing method.

The mutual repeater may receive the initial address message corresponding to a call setup message (SETUP) transmitted by the mobile terminal to the destination terminal from the mobile exchange, and determine a routing scheme of the initial address message. . In the routing method of the initial address message, it is determined whether the bearer capability of the mobile terminal is a video / voice by analyzing the initial address message received from the mobile exchange. Determine a routing scheme to transmit the initial address message, and if the bearer capability of the mobile terminal is voice, determine a routing scheme for a voice call between the mobile terminal and the called terminal and determine the routing scheme. According to the routing may be characterized.

The transmission / reception unit 802 may transmit and receive an invite message and a response message with the called terminal through an intelligent switching device.

The re-determination unit 803 may include a routing re-determination unit for analyzing the response message and re-determining the routing scheme according to the bearer capability of the called terminal and whether the video call is answered. The image determining unit determines whether the bearer capability of the called terminal is a video by analyzing the response message. When the bearer capability of the called terminal is a video, the routing re-determination unit analyzes the response message and the incoming call is analyzed. A response determining unit that determines whether the terminal answers the video call; if the bearer capability of the called terminal is a video and the called terminal has a video call response, routing for a video call between the mobile terminal and the called terminal The video determining unit re-determining the scheme and the determination result, if the bearer capability of the called terminal is voice or if there is no video call response from the called terminal, transmit a predetermined reason code to the mobile terminal. It may include a voice determination unit for re-determining the routing scheme.

The voice determination unit transmits the reason code to the mutual repeater, the mutual repeater transmits the received reason code to a mobile exchange, and the mobile exchange sends a USSD message corresponding to the received reason code to the mobile terminal. It may include a USSD message unit for re-determining the routing scheme to transmit.

The called terminal may include a VoIP terminal.

According to the second embodiment of the present invention, the receiving unit 801 receives an initial address message (IAM) from the video gateway according to a predetermined routing scheme as a call control from the VoIP terminal to the called terminal, and the transceiver unit 802 transmits a letter of request (LOR) corresponding to the initial address message to a home location register associated with the called terminal, receives a predetermined response message from the home location register, and then re-determining unit. 803 may determine the routing scheme reflecting the rerouting issue according to the called terminal by analyzing the response message, and the execution unit 804 may perform routing according to the routing scheme.

The video gateway may transmit the initial address message corresponding to the invite message received from the intelligent switching equipment, and the intelligent switching equipment receives an INVITE message for the called terminal from the VoIP terminal. By analyzing the invite message, a routing scheme of the invite message may be determined.

The routing method of the invite message analyzes the invite message to determine whether the bearer capability of the VoIP terminal is a video / audio, and if the bearer capability of the VoIP terminal is a video, determining that the bearer capability of the VoIP terminal is the video. Determine a routing scheme to transmit the initial address message corresponding to an invite message, and if the bearer capability of the VoIP terminal is voice, determine a routing scheme for a voice call between the VoIP terminal and the called terminal. Determine and perform routing according to the routing scheme.

The transceiver 802 transmits a pseudorandom noise (PRN) corresponding to the received request message to the mobile switch, and receives a pseudo random number response message for the pseudo random message from the mobile switch. It may be characterized by receiving.

The re-determination unit 803 may re-determine the routing scheme according to the bearer capability of the called terminal and the answer of the video call by analyzing the response message. Routing re-decision unit may be included. The image determining unit determines whether the bearer capability of the called terminal is a video by analyzing the response message. When the bearer capability of the called terminal is a video, the routing re-determination unit analyzes the response message and the incoming call is analyzed. A response determining unit that determines whether the terminal answers the video call, and if the bearer capability of the called terminal is a video and the called terminal has a video call response, routing for a video call between the VoIP terminal and the called terminal The video determining unit re-determining the method and the determination result, if the bearer capability of the called terminal is voice or there is no video call response of the called terminal, transmit a predetermined reason code to the VoIP terminal. It may include a voice determination unit for re-determining the routing scheme.

The rerouting system 800 may further include an extracting unit for extracting terminal information of the called terminal from the subscriber database using interworking with a subscriber database of the called network. The re-determining unit 803 analyzes the terminal information to determine whether the bearer capability of the called terminal is an image, and if the bearer capability of the called terminal is an image, analyzing the response message. A response determining unit determining whether the called terminal has a video call response, and if the bearer capability of the called terminal is a video and there is a video call response of the called terminal, the video call between the VoIP terminal and the called terminal is established. In order to re-determine the routing scheme, and the determination result, if the bearer capability of the called terminal is voice or there is no video call response from the called terminal, a reason code (Reason Code) agreed upon is transmitted to the VoIP terminal. It may include a voice determination unit for re-determining the routing scheme to transmit.

The voice determination unit transmits the reason code to the video gateway, the video gateway transmits the received reason code to the intelligent switching device, and the intelligent switching device sends the received reason code to the VoIP terminal. It may include a reason code section for re-determining the routing scheme.

The called terminal may include a mobile terminal.

The rerouting method according to the present invention, which does not support the receiver terminal image capability, may be implemented in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

The rerouting method and system according to the present invention, which does not support the terminal terminal video capability, receives an initial address message (IAM) from a mutual relay according to a predetermined routing scheme as a call control from the mobile terminal to the destination terminal. After receiving an invite message corresponding to the initial address message to the called terminal, receiving a predetermined response message from the called terminal, analyzing the response message, the routing scheme reflecting the rerouting issue according to the called terminal By re-determining and performing routing according to the routing scheme, if an issue occurs in which video calling is impossible by the called terminal, a proper rerouting scheme is provided to provide a user with a chance to redial, and the user re-sends a request. Automatically voice calls to Neunghage can. As a result, a user can automatically receive a voice call service as a workaround for a video call, and can simplify the unnecessary call setup procedure to a minimum, which can have a great effect on the efficient service performance of a network operator.

Claims (41)

Receiving, at a receiving unit, an initial address message (IAM) from the mutual relay according to a routing scheme of the mutual relay, wherein the initial address message is received for call setup from a mobile terminal to a destination terminal; The transceiver transmits an invite message corresponding to the initial address message to the called terminal. Receiving a response message corresponding to the invite message from the called terminal; Re-determining, by the re-determining unit, analyzing the response message and re-determining a routing scheme for a video call when the bearer capability of the called terminal is a video and there is a video call response of the called terminal; And In the performing unit, performing the routing according to the routing scheme, The initial address message is a call request message of a mobile network associated with the mobile terminal, the invite message is a call request message of a destination network associated with the destination terminal, and the response message is a call response message of the destination network. A rerouting method according to a called terminal. The method of claim 1, The mutual repeater, Receiving the initial address message corresponding to a call setup message (SETUP) transmitted by the mobile terminal to the mobile terminal from the mobile terminal, And a routing method of the initial address message is determined. The method of claim 2, Routing scheme of the initial address message, Analyzing the initial address message received from the mobile exchange to determine whether the bearer capability of the mobile terminal is a video / voice, If the bearer capability of the mobile terminal is a result of the determination, determine a routing scheme to transmit the initial address message, and When the bearer capability of the mobile terminal is voice as a result of the determination, the routing method for the voice call between the mobile terminal and the called terminal is determined and routing is performed according to the routing method. Routing method. The method of claim 1, The step of transmitting an invite message corresponding to the initial address message to the called terminal and receiving a response message corresponding to the invite message from the called terminal, Rerouting method according to a called terminal, characterized in that via the intelligent switching equipment for transmitting the invite message and the response message. delete The method of claim 1, If the bearer capability of the called terminal is a video by analyzing the response message and there is a video call response of the called terminal, the step of re-determining a routing scheme for the video call, Analyzing whether the bearer capability of the called terminal is an image by analyzing the response message; If the bearer capability of the called terminal is a video, determining whether the called terminal answers the video call by analyzing the response message; Re-determining a routing scheme for a video call between the mobile terminal and the called terminal when the bearer capability of the called terminal is a video and the video call response of the called terminal is determined; And Re-determining a routing scheme to transmit a predetermined reason code to the mobile terminal if the bearer capability of the called terminal is voice or if there is no video call response of the called terminal. Rerouting method according to the called terminal comprising a. The method of claim 6, In the determining that the bearer capability of the called terminal is voice or there is no video call response of the called terminal, re-determining a routing scheme to transmit a previously agreed reason code to the mobile terminal, Re-determine a routing scheme to send the reason code to the mutual repeater, And the mutual relay transmits the reason code to the mobile exchange, and the mobile exchange transmits a USSD message corresponding to the reason code to the mobile terminal. The method of claim 7, wherein The mobile terminal exposes the USSD message, When the mutual repeater receives a voice mode call setup message (SETUP) according to a call back from the mobile terminal, automatically determines a routing scheme for a voice call between the mobile terminal and the called terminal. And rerouting according to the automatically determined routing scheme. The method of claim 1, And the called terminal comprises a VoIP terminal. Receiving, at a receiving unit, an initial address message (IAM) from an image gateway according to a routing scheme of an intelligent switching equipment, wherein the initial address message is received for call establishment from a VoIP terminal to a called terminal; The transceiver transmits a letter of request (LOR) corresponding to the initial address message to a home location register associated with the called terminal, Receiving a response message corresponding to the request message from the home location register; Re-determining, by the re-determining unit, analyzing the response message and re-determining a routing scheme for a video call when the bearer capability of the called terminal is a video and there is a video call response of the called terminal; And In the performing unit, performing the routing according to the routing scheme, The initial address message is a call request message of a called network associated with the called terminal, the request message is an information request message of the called network, and the response message is an information response message of the called network. Rerouting method accordingly. The method of claim 10, The video gateway, And transmitting the initial address message corresponding to the invite message received from the intelligent switching device. The invite message is a call request message of a VoIP network associated with the VoIP terminal. The method of claim 11, The intelligent exchange equipment, Receiving an INVITE message for the called terminal from the VoIP terminal, The routing method according to the called terminal, characterized in that for determining the routing scheme of the invite message by analyzing the invite message. The method of claim 12, Routing scheme of the invite message, Analyzing the invite message to determine whether the bearer capability of the VoIP terminal is video / audio; Determining that a routing scheme is to transmit the initial address message corresponding to the invite message to the video gateway when the bearer capability of the VoIP terminal is a video; and When the bearer capability of the VoIP terminal is voice as a result of the determination, the routing method for the voice call between the VoIP terminal and the called terminal is determined and routing is performed according to the routing method. Routing method. The method of claim 10, The home location register, And a pseudo random number message (PRN) corresponding to the request message to a mobile exchange, and receiving a pseudo random number response message for the pseudo random number message from the mobile exchange. . delete The method of claim 10, If the bearer capability of the called terminal is a video by analyzing the response message and there is a video call response of the called terminal, the step of re-determining a routing scheme for the video call, Analyzing whether the bearer capability of the called terminal is an image by analyzing the response message; If the bearer capability of the called terminal is a video, determining whether the called terminal answers the video call by analyzing the response message; Re-determining a routing scheme for a video call between the VoIP terminal and the called terminal when the bearer capability of the called terminal is a video and the video call response of the called terminal is determined as the determination result; And If the bearer capability of the called terminal is voice or if there is no video call response of the called terminal, re-determining a routing scheme to transmit a predetermined reason code to the VoIP terminal; Rerouting method according to the called terminal comprising a. The method of claim 10, Extracting terminal information of the called terminal from the subscriber database using an interworking with a home location register (HLR) of a called network; Rerouting method according to the called terminal further comprising. The method of claim 17, If the bearer capability of the called terminal is a video by analyzing the response message and there is a video call response of the called terminal, the step of re-determining a routing scheme for the video call, Analyzing the terminal information to determine whether a bearer capability of the called terminal is an image; If the bearer capability of the called terminal is a video, determining whether the called terminal answers the video call by analyzing the response message; Re-determining a routing scheme for a video call between the VoIP terminal and the called terminal when the bearer capability of the called terminal is a video and the video call response of the called terminal is determined as the determination result; And If the bearer capability of the called terminal is voice or if there is no video call response of the called terminal, re-determining a routing scheme to transmit a predetermined reason code to the VoIP terminal; Rerouting method according to the called terminal comprising a. The method according to claim 16 or 18, In the determining that the bearer capability of the called terminal is voice or the mobile terminal does not have a video call response, the step of re-determining a routing scheme to transmit a predetermined reason code to the VoIP terminal, Re-determine a routing scheme to send the reason code to the video gateway, The video gateway transmits the reason code to the intelligent switching device, and the intelligent switching device sends the reason code to the VoIP terminal. The method of claim 19, The VoIP terminal exposes a call back message corresponding to the reason code, The intelligent switching equipment automatically determines a routing scheme for a voice call between the VoIP terminal and the called terminal when receiving the voice mode INVITE message according to the call back from the VoIP terminal. And rerouting according to the automatically determined routing scheme. The method of claim 10, The called terminal comprises a mobile terminal rerouting method according to the called terminal. The method of claim 1, Assigning a call channel between the mobile terminal and the called terminal with reference to the call setting after completing call setup according to the routing; Rerouting method according to the called terminal further comprising. The method of claim 10, Assigning a call channel between the VoIP terminal and the called terminal with reference to the call setting after completing call setup according to the routing; Rerouting method according to the called terminal further comprising. A computer for recording a program for executing the method of any one of claims 1 to 4, 6 to 14, 16 to 18, and 21 to 23. Recordable media readable from. A receiving unit for receiving an initial address message (IAM) from the mutual relay according to a routing scheme of the mutual relay, wherein the initial address message is received for call setup from a mobile terminal to a called terminal; Send an invite message corresponding to the initial address message to the called terminal; A transceiver for receiving a response message corresponding to the invite message from the called terminal; A re-determination unit for re-determining a routing method for a video call when analyzing the response message and the bearer capability of the called terminal is a video and the called terminal has a video call response; And Including the performing unit for performing routing according to the routing scheme, The initial address message is a call request message of a circuit network associated with the mobile terminal, the invite message is a call request message of a packet network associated with the called terminal, and the response message is a call response message of the packet network. A rerouting system according to a called terminal. The method of claim 25, The mutual repeater, Receiving the initial address message corresponding to a call setup message (SETUP) transmitted by the mobile terminal to the mobile terminal from the mobile terminal, And a routing method of the initial address message is determined. The method of claim 26, Routing scheme of the initial address message, Analyzing the initial address message received from the mobile exchange to determine whether the bearer capability of the mobile terminal is a video / voice, If the bearer capability of the mobile terminal is a result of the determination, determine a routing scheme to transmit the initial address message, and When the bearer capability of the mobile terminal is voice as a result of the determination, the routing method for the voice call between the mobile terminal and the called terminal is determined and routing is performed according to the routing method. Routing system. delete The method of claim 25, The re-determination unit, An image determination unit determining whether a bearer capability of the called terminal is an image by analyzing the response message; A response determination unit for determining whether the called terminal responds to a video call by analyzing the response message when the bearer capability of the called terminal is a video; An image determining unit re-determining a routing scheme for a video call between the mobile terminal and the called terminal when the bearer capability of the called terminal is a video and the video call response of the called terminal is determined; And The voice determination unit re-determining a routing scheme to transmit a predetermined reason code to the mobile terminal when the bearer capability of the called terminal is voice or when there is no video call response of the called terminal. Rerouting system according to the called terminal comprising a. The method of claim 29, The voice determination unit, Re-determine a routing scheme to send the reason code to the mutual repeater, And the mutual relay transmits the received reason code to the mobile exchange, and the mobile exchange transmits a USSD message corresponding to the received reason code to the mobile terminal. The method of claim 30, The mobile terminal exposes the USSD message, When the mutual repeater receives a voice mode call setup message (SETUP) according to a call back from the mobile terminal, automatically determines a routing scheme for a voice call between the mobile terminal and the called terminal. And rerouting according to the automatically determined routing scheme. A receiving unit for receiving an initial address message (IAM) from an image gateway according to a routing scheme of an intelligent switching equipment, wherein the initial address message is received for call setup from a VoIP terminal to a called terminal; Send a request message (LOR: Letter Of Request) corresponding to the initial address message to a home location register associated with the called terminal; A transceiver for receiving a response message corresponding to the request message from the home location register; A re-determination unit for re-determining a routing method for a video call when analyzing the response message and the bearer capability of the called terminal is a video and the called terminal has a video call response; And Including the performing unit for performing routing according to the routing scheme, The initial address message is a call request message of a called network associated with the called terminal, the request message is an information request message of the called network, and the response message is an information response message of the called network. According to the rerouting system. 33. The method of claim 32, The video gateway, And transmitting the initial address message corresponding to the invite message received from the intelligent switching device. And the invite message is a call request message of a VoIP network associated with the VoIP terminal. The method of claim 33, wherein The intelligent exchange equipment, Receiving an INVITE message for the called terminal from the VoIP terminal, Rerouting system according to the receiving terminal, characterized in that for determining the routing scheme of the invite message by analyzing the invite message. The method of claim 34, wherein Routing scheme of the invite message, Analyzing the invite message to determine whether the bearer capability of the VoIP terminal is video / audio; Determining that a routing scheme is to transmit the initial address message corresponding to the invite message to the video gateway when the bearer capability of the VoIP terminal is a video; and When the bearer capability of the VoIP terminal is voice as a result of the determination, the routing method for the voice call between the VoIP terminal and the called terminal is determined and routing is performed according to the routing method. Routing system. delete 33. The method of claim 32, The re-determination unit, An image determination unit determining whether a bearer capability of the called terminal is an image by analyzing the response message; A response determination unit for determining whether the called terminal responds to a video call by analyzing the response message when the bearer capability of the called terminal is a video; An image determining unit re-determining a routing scheme for a video call between the VoIP terminal and the called terminal when the bearer capability of the called terminal is a video and a video call response of the called terminal is determined; And If the bearer capability of the called terminal is voice or if there is no video call response of the called terminal, the voice determining unit re-determines a routing scheme to transmit a predetermined reason code to the VoIP terminal. Rerouting system according to the called terminal comprising a. 33. The method of claim 32, Extraction unit for extracting the terminal information of the called terminal from the subscriber database using the interworking with the subscriber database of the destination network Rerouting system according to the called terminal further comprising. The method of claim 38, The re-determination unit, An image determination unit determining whether a bearer capability of the called terminal is an image by analyzing the terminal information; A response determination unit for determining whether the called terminal responds to a video call by analyzing the response message when the bearer capability of the called terminal is a video; An image determining unit re-determining a routing scheme for a video call between the VoIP terminal and the called terminal when the bearer capability of the called terminal is a video and a video call response of the called terminal is determined; And If the bearer capability of the called terminal is voice or if there is no video call response of the called terminal, the voice determining unit re-determines a routing scheme to transmit a predetermined reason code to the VoIP terminal. Rerouting system according to the called terminal comprising a. The method of claim 37 or 39, The voice determination unit, Re-determine a routing scheme to send the reason code to the video gateway, And the video gateway transmits the reason code to the intelligent switching device, and the intelligent switching device re-determines a routing scheme to send the reason code to the VoIP terminal. The method of claim 40, The VoIP terminal exposes a call back message corresponding to the reason code, The intelligent switching equipment automatically determines a routing scheme for a voice call between the VoIP terminal and the called terminal when receiving the voice mode INVITE message according to the call back from the VoIP terminal. And rerouting according to the called terminal according to the automatically determined routing scheme.

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