JP2009044314A - Media transfer method, apparatus and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a media transfer method and apparatus for housing a plurality of media terminals having different media transfer methods and determining a media transfer method with a small load every time a medium is transferred, and to provide a program. <P>SOLUTION: When a simultaneos fixing mode is inputted into a mode switching portion 11, a transfer model inputted simultaneously is transferred to a media transfer function portion 14, and media transfer is carried out with the transfer model. When a port designation mode is inputted, a port receiving a media signal simultaneously inputted and a transfer model corresponding to the port, are transmitted to the media transfer function portion 14. Then, media transfer is carried out with the transfer model corresponding to the port receiving a media signal to be transferred. When an automatic mode is inputted, SIP (Session Initiation Protocol)/SDP (Session Description Protocol) signals are analyzed by an SIP stack control function portion 12 and a B2BUA processing function portion 13 and a suitable transfer model is determined to be transmitted to the media transfer function portion 14. Media transfer is carried out with the transfer model. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention transfers information packets (hereinafter referred to as media or media signals) such as voice information, image information, and video information between home networks (in-home NW) or between the home NW and various servers. In particular, the present invention relates to a media transfer technology that supports a plurality of media transfer methods and reduces the processing load.

  Conventionally, a voice call service between a voice call terminal, an image, and a voice call terminal, a video call terminal, a video distribution terminal, and other terminal devices (media terminals) installed in the home NW and accommodated in the home NW. Media that provides various media services such as video call service (including audio) between call terminals and video distribution service for viewing video (including audio) distributed from a video distribution server on a video distribution terminal A transfer device is known (see, for example, Patent Document 1).

  FIG. 2 shows an example of a media service using a conventional media transfer device, in this case, an example of a voice call service. In FIG. 2, 20 is a home NW, 30 is a home NW on the opposite side of the voice call service, and 40 is External NW.

  Media transfer devices 21 and 31 are installed in the home NWs 20 and 30, respectively. Further, the media transfer devices 21 and 31 accommodate (connect) the voice call terminals 22 and 32, and also via ONUs (Optical Network Units) 23 and 33. Connected to the external NW 40.

  The media transfer devices 21 and 31 have inputs and outputs on the external NW side (hereinafter referred to as WAN side) and inputs and outputs on the voice call terminal side (hereinafter referred to as LAN side). It has a media transfer function of transferring an input media signal (in this case, an audio media signal) to the LAN side output and transferring a media signal input from the LAN side input to the WAN side output.

  In the voice call service, the media signal output from the voice call terminal 22 is input from the LAN side input of the media transfer device 21. The media transfer device 21 transfers the input media signal to the WAN side output. The output media signal reaches the partner premises NW 30 via the ONU 23 and the external NW 40, and is sent to the partner voice call terminal 32 via the ONU 33 and the media transfer device 31 in the partner premises NW 30.

  On the other hand, the media signal output from the other party voice call terminal 32 reaches the in-home NW 20 via the media transfer device 31, ONU 33 and the external NW 40 in the other party in-house NW 30, and through the ONU 23 in the in-home NW 20 It is input to the WAN side input of the media transfer device 21. The media transfer device 21 transfers the inputted media signal to the LAN side output, and the outputted media signal reaches the voice call terminal 22.

  In the case of the voice call service, the media signal transmitted from the voice call terminal 21 to the voice call terminal 31 and the media signal transmitted from the voice call terminal 31 to the voice call terminal 21 are exchanged in this way. A call is established.

  For this reason, when the media transfer processing delay in the media transfer devices 21 and 31 increases, the delay in voice exchange between the voice call terminals 22 and 32 increases and the comfort of the voice call is impaired. For this reason, in the voice call service, media transfer devices 21 and 31 that have a media transfer function using a termination model having a characteristic with a small processing delay are used.

  FIG. 3 shows another example of a media service using a conventional media transfer device, in this case, an example of an image call service. In FIG. 3, 20 is a home NW, 40 is an external NW, and 50 is an opposite of the image call service. This is the local NW on the side.

  Media transfer devices 21b and 51 are installed in the home NWs 20 and 50, respectively. Further, the media transfer devices 21b and 51 accommodate (connect) the image call terminals 24 and 52, and are connected to the external NW 40 via the ONUs 23 and 53. ing.

  The media transfer devices 21b and 51 have inputs and outputs on the WAN side, inputs and outputs on the image call terminal side (hereinafter referred to as LAN side), and media signals (in this case, images) input from the WAN side input. (Audio media signal) is transferred to the LAN side output, and a media transfer function of transferring the media signal input from the LAN side input to the WAN side output is provided.

  In the image call service, the media signal output from the image call terminal 24 is input from the LAN side input of the media transfer device 21b. The media transfer device 21b transfers the input media signal to the WAN side output. The output media signal reaches the other party NW 50 via the ONU 23 and the external NW 40, and is sent to the other party image call terminal 52 via the ONU 53 and the media transfer device 51 in the other party NW 50.

  On the other hand, the media signal output from the partner video call terminal 52 reaches the home NW 20 via the media transfer device 51, the ONU 53 and the external NW 40 in the partner home NW 50, and passes through the ONU 23 in the home NW 20. It is input to the WAN side input of the media transfer device 21b. The media transfer device 21b transfers the input media signal to the LAN side output, and the output media signal reaches the image call terminal 24.

  In the case of the image call service, the media signal transmitted from the image call terminal 24 to the image call terminal 52 and the media signal transmitted from the image call terminal 52 to the image call terminal 24 are exchanged in this way. A call is established.

  For this reason, when the media transfer processing delay in the media transfer devices 21b and 51 becomes large, the delay in the exchange of images and sounds between the image call terminals 24 and 52 becomes large, and the comfort of the image call is impaired. For this reason, in the image call service, media transfer devices 21b and 51 that have a media transfer function using a termination model having a characteristic with a small processing delay are used as in the case of the voice call service.

  FIG. 4 shows still another example of a media service using a conventional media transfer apparatus, in this case, an example of a video distribution service. In FIG. 4, 20 is a home NW, 40 is an external NW, and 61 is a video distribution server. is there.

  A media transfer device 21 c is installed in the home NW 20, and the media transfer device 21 c accommodates (connects) the video distribution terminal 25 and is connected to the external NW 40 via the ONU 23. The video distribution server 61 is connected to the external NW 40.

  The media transfer device 21c has input and output on the WAN side, input and output on the video distribution terminal side (hereinafter referred to as LAN side), and media signals (in this case, video / audio) input from the WAN side input. A media transfer function for transferring a media signal input from the LAN side input to the WAN side output.

  In the video distribution service, the distribution media signal distributed from the video distribution server 61 reaches the home NW 20 via the external NW 40, and is input to the WAN side input of the media transfer device 21c via the ONU 23 in the home NW 20. The media transfer device 21 c transfers the input media signal to the LAN side output, and the output media signal reaches the video distribution terminal 25. Video distribution is established as described above.

  In the case of a video distribution service, since the transfer is a one-way transfer of media from the distribution server 61 to the video distribution terminal 25, the serviceability is not affected even if the processing delay is large. Instead, since a large amount of data is distributed as compared with the case of voice communication or normal image communication, high transfer performance capable of reliably transferring a large amount of data becomes important.

  As a method having such characteristics, there is a routing model method or a linked NAPT model method. Furthermore, the routing model is a transfer model when a terminal under the media transfer device has a global address, and the linked NAPT model assigns a private address to the terminal under the media transfer device, and the global address is set in the media transfer device. And transfer model when private address needs to be converted.

  For this reason, as the media transfer device 21c, a media transfer device having a routing model is used when a subordinate terminal has a global address, and the subordinate terminal does not have a global address, When it is necessary to assign a private address to a subordinate terminal in the transfer device and convert the global address and the private address, a media transfer device having a linked NAPT model is used.

As described above, conventionally, it is necessary to prepare a media transfer apparatus having a media transfer function according to a media terminal to be used.
JP 2005-252477 A

  The construction of next-generation networks is progressing, and a network environment that can use multiple services simultaneously in a wide band is being prepared. To enjoy the benefits of such a network environment, multiple media terminals that have been used separately can be simultaneously used. It became possible to use.

  However, when the media transfer functions required by the respective media terminals are different, the conventional method needs to prepare a plurality of types of media transfer apparatuses each having a media transfer function suitable for each media terminal.

  As a method for solving this problem, the media transfer method appropriate for the media terminal is analyzed by analyzing the SIP information, etc. by supporting all media transfer functions (media transfer methods) of the termination model, routing model, and linked NAPT model. It is possible to select media and perform media transfer. However, in this method, since it is necessary to select a media transfer method every time, that is, every time media transfer is performed, there is a problem that a load of determination is imposed as compared with a case where the method is fixed.

  For example, when only one type of media transfer method terminal is connected to the media transfer device, media transfer can be performed by fixing to the corresponding media transfer method. In the above method, the media transfer method is selected each time. There was a first problem that it took a load to do.

  In addition, when using a media transfer device, it is common to continue to use the connection system when the terminal is connected to the subordinate. However, even when the port and transfer method are fixedly determined as described above, This method has a second problem that a load for selecting a media transfer method is applied each time.

  The present invention solves the above-described problem, can accommodate a plurality of media terminals with different media transfer methods, and determines the media transfer method every time media transfer is performed depending on the actually accommodated media terminals. The present invention provides a media transfer method, an apparatus, and a program that are not burdened with the above.

  In order to solve the above-described problems, the present invention provides a media transfer method for performing media transfer using a plurality of different media transfer methods using a computer, wherein the computer includes a batch fixed mode, a port designation mode, and an automatic mode. A step of receiving a media transfer method designation input for the batch fixed mode and a port for receiving a media signal and a corresponding media transfer method designation input for the port designation mode, together with selection input for one of the operation modes. When the batch fixed mode is selected and input, the step of performing media transfer according to the specified and input media transfer method, and when the port specifying mode is selected and input, the port corresponding to the port to which the media signal is input Media transfer by the specified media transfer method When the automatic mode is selected and input, the SIP / SDP signal before media transfer is analyzed to determine the media transfer method, and the necessary transfer for media transfer from the SDP unit according to the determined media transfer method The present invention proposes a media transfer method for extracting information and executing the media transfer method and the step of performing media transfer according to the transfer information.

  The present invention also provides a media transfer apparatus that performs media transfer using a plurality of different media transfer methods, and performs batch fixing together with selection input of an operation mode of a batch fixing mode, a port designation mode, and an automatic mode. When the mode transfer unit accepts the media transfer method designation input for the mode, and the port selection mode accepts the media signal input port and the corresponding media transfer method designation input, and the batch fixed mode is selected and input, Collective fixed mode media transfer means for performing media transfer in accordance with the designated input media transfer method, and when the port designation mode is selected and inputted, the designated and inputted media transfer method corresponding to a port to which a media signal is inputted Port designation mode media transfer with media transfer When the transfer means and the automatic mode are selected and input, the media transfer method is determined by analyzing the SIP / SDP signal before the media transfer, and transfer information necessary for the media transfer is obtained from the SDP unit according to the determined media transfer method. The present invention proposes a media transfer apparatus that includes an automatic mode media transfer means that extracts and performs media transfer according to the media transfer method and transfer information.

  Further, the present invention is a media transfer apparatus that performs media transfer using a plurality of different media transfer methods, and includes a mode switching unit, a SIP stack control function unit, a B2BUA control function unit, and a media transfer function unit. , The mode switching unit receives the selection input for the operation mode from the batch fixed mode, port designation mode, and automatic mode, the media transfer method designation input for the batch fixed mode, and the media signal for the port designation mode. When the designated input of the input port and the corresponding media transfer method is accepted and the batch fixed mode is selected and inputted, the designated media transfer method is transferred to the media transfer function unit and the flag is set to “0” Is transferred to the SIP stack control function unit and the media transfer function unit. When the mode is selected and input, the port to which the designated input media signal is input and the corresponding media transfer method are transferred to the media transfer function unit, and the flag set to “1” is set to the SIP stack control function unit and the media. When the automatic mode is selected and input, the flag set to “2” is transferred to the SIP stack control function unit and the media transfer function unit. The SIP stack control function unit Only when the flag set to "" is received, it has a function to transfer the SIP / SDP signal before the media transfer to the B2BUA control function unit. The B2BUA control function unit has the SIP / SDP transferred from the SIP stack control function unit. The SDP part is extracted from the signal and the media transfer method is determined by analyzing the extracted information of the SDP part. A function of extracting transfer information necessary for media transfer from the SDP unit according to the determined media transfer method, and transferring the extracted transfer information to the media transfer function unit together with the determined media transfer method; When the function unit receives the flag set to “0”, it performs media transfer by the media transfer method transferred from the mode switching unit, and when it receives the flag set to “1”, it switches the mode. Perform media transfer using the media transfer method corresponding to the port to which the media signal transferred from the input port and the port to which the media signal to be transferred is input out of the corresponding media transfer methods are set to “2” Received, the media transfer method and transfer information transferred from the B2BUA control function unit A media transfer apparatus having a function of performing media transfer is proposed.

  According to the present invention, a program for causing a computer to realize the functions described in claim 3 is proposed.

  The present invention performs media transfer by a designated media transfer method (one type) according to a preselected operation mode, or media by a media transfer method designated corresponding to a port to which a media signal is input. It is characterized in that the transfer is performed or the media transfer is performed by automatically determining an appropriate media transfer method according to the contents of the SDP.

  As a result, multiple media terminals with different media transfer methods can be simultaneously accommodated under one media transfer device, and when using a fixed terminal, the load of determination can be reduced by specifying the media transfer method. It is a method that can. As a result, when only one type of media transfer method terminal is connected to the media transfer device, it is difficult to select the method every time by specifying the media transfer method in advance. The problem can be solved. In addition, as a method of using the media transfer device, if the correspondence between the port and the media transfer method is fixed, the method can be changed each time by specifying the correspondence between the port and the media transfer method in advance. The second problem that a load is applied to select can be solved.

  As described above, according to the present invention, various media terminals can be accommodated at the same time. As a result, the benefits of NGN (Next Generation Network) services can be enjoyed, and media transfer can be performed using designated parameters. The determination load can be reduced by fixing the method.

  FIG. 1 shows an example of an embodiment of a media transfer apparatus according to the present invention. This media transfer apparatus 10 includes a mode switching unit 11, a SIP stack control function unit 12, a B2BUA control function unit 13, and a media transfer. It consists of a functional unit 14.

  The mode switching unit 11 is fixed together with a selection input of one of three operation modes from an input device (not shown) such as a keyboard, that is, a batch fixing mode, a port designation mode, and an automatic mode. For the mode, it accepts the media transfer method designation input. For the port designation mode, it accepts the port to which the media signal is input and the media transfer method designation input corresponding to this. The media transfer method is transferred to the media transfer function unit 14 and the flag set to “0” is transferred to the SIP stack control function unit 12 and the media transfer function unit 14. When the port designation mode is selected and inputted, it is designated and inputted. Select the port to which the media signal is input and the corresponding media transfer method. The flag set to “1” is transferred to the transfer function unit 14 and transferred to the SIP stack control function unit 12 and the media transfer function unit 14. When the automatic mode is selected and input, the flag set to “2” is set to SIP. Transfer to the stack control function unit 12 and the media transfer function unit 14.

  The operation in the mode switching unit 11 will be described according to the flow of FIG.

  First, the operation mode selected and input to the mode switching unit 11 is confirmed (determined) (step s1).

  When the batch fixed mode is selected and input, the mode switching unit 11 transfers the flag set to “0” and the designated and input media transfer method to the media transfer function unit 14 (step s2). Further, the flag set to “0” is transferred from the mode switching unit 11 to the SIP stack control function unit 12 (step s3).

  When the port designation mode is selected and input, the flag set to “1” from the mode switching unit 11 to the media transfer function unit 14 and the port to which the designated input media signal is input and the fixed media transfer method corresponding thereto Is transferred (step s4). Further, the flag set to “1” is transferred from the mode switching unit 11 to the SIP stack control function unit 12 (step s5).

  When the automatic mode is selected and input, the flag set to “2” is transferred from the mode switching unit 11 to the media transfer function unit 14 and the SIP stack control function unit 12 (step s6).

  When the flag transferred from the mode switching unit 11 is “2”, the SIP stack control function unit 12 receives the SIP / SDP signal input from the media terminal under the media transfer device or the opposite media terminal before the media transfer. The data is transferred to the B2BUA control function unit 13.

  The SIP stack control function unit 12 does not perform the subsequent operations when the flag transferred from the mode switching unit 11 is “0” or “1”.

  Here, SIP (Session Initiation Protocol) is a protocol for establishing, changing, and disconnecting a multimedia session, and includes a request line, a header, and a message body. Among these, in the message body, information related to the multimedia session is described by a protocol called SDP (Session Description Protocol). For example, in the format of m = “value”, the media type (audio, video, text, etc.), the port number for receiving the media, and the transport protocol (RTP, TCP, etc.) used for media reception are described as information about the media. Is done. Further, for example, in the format of c = “value”, the network type, the IP version (IPv4, IPv6, etc.), and the IP address for receiving the media are described as connection information.

  The B2BUA control function unit 13 further includes a B2BUA processing function unit 15, an SDP processing function unit 16, and a media transfer control function unit 17.

  The B2BUA processing function unit 15 extracts the SDP unit from the SIP / SDP signal transferred from the SIP stack control function unit 12 and transfers the extracted information of the SDP unit to the SDP processing function unit 16. The SDP processing function unit 16 analyzes the information of the SDP unit transferred from the B2BUA processing function unit 15 to determine a media transfer method (media transfer model), and sends the determined media transfer model to the B2BUA processing function unit 15. Forward.

  The operation of determining the media transfer model in the SDP processing function unit 16 will be described according to the flow of FIG.

  First, among the information of the SDP part transferred from the B2BUA processing function part 15, the IP version of the C line is checked to distinguish between IPv4 and IPv6 (steps s11 and s12). Here, if the IP version of the C line is IPv6, the routing model is determined as the media transfer model (step s13).

  On the other hand, if the IP version of the C line is IPv4, the transport of the m line in the information of the SDP part is further checked to distinguish between RTP / AVP and other (steps s14 and s15). At this time, if the transport of m rows is RTP / AVP, the termination model is determined as the media transfer model (step s16). If the transport of m rows is other than RTP / AVP, the linked NAPT model is determined as the media transfer model (step s17).

  Finally, the media transfer model information determined in steps s13, s16, and s17 is transferred from the SDP processing function unit 16 to the B2BUA processing function unit 15 (step s18).

  When the B2BUA processing function unit 15 receives the media transfer model information from the SDP processing function unit 16, the B2BUA processing function unit 15 transfers the media transfer model together with the SDP unit to the media transfer control function unit 17.

  The media transfer control function unit 17 extracts transfer information necessary for media transfer from the SDP unit in accordance with the transfer model transferred from the B2BUA processing function unit 15 and the extracted transfer information together with the determined media transfer model. Transfer to the media transfer function unit 13.

  The operation of extracting transfer information in the media transfer control function unit 17 will be described according to the flow of FIG.

  First, the media transfer model transferred from the B2BUA processing function unit 15 is confirmed (determined) (step s21).

  When the media transfer model is a termination model, information on the IP address and port number for receiving the media of the media terminal under the media transfer device and the opposite media terminal is extracted from the SDP unit (step s22). If the media transfer model is the linked NAPT model, the IP address / port number information for receiving the media of the opposite media terminal is extracted from the SDP unit (step s23). Furthermore, the transfer information necessary for the media transfer extracted in steps s22 and s23 is transmitted to the media transfer function unit 14 together with the media transfer model transferred from the B2BUA processing function unit 15 (step s24).

  When the media transfer model transferred from the B2BUA processing function unit 15 is a routing model, only the media transfer model (routing model) is transmitted to the media transfer function unit 14 (step s25).

  The media transfer function unit 14 performs media transfer and SDP rewrite according to the flag / transfer model / transfer information transferred from the mode transfer unit 11 or the media transfer control function unit 17 of the B2BUA control function unit 13 and performs the rewrite. The SDP unit is transferred to the SIP stack control function unit 12 via the media transfer control function unit 17 and the B2BUA processing function unit 15 of the B2BUA control function unit 13.

  Operations for performing media transfer and SDP rewriting in the media transfer function unit 14 will be described with reference to the flowchart of FIG.

  First, the flag transferred from the mode switching unit 11 is confirmed (determined) (step s31). If the flag is “0”, the media transfer model transferred from the mode switching unit 11 is confirmed (step s32). . When the flag is “1”, the correspondence between the port transferred from the mode switching unit 11 and the media transfer model is confirmed, and the media transfer model corresponding to the port of the transmitted media signal is confirmed (step s33). If the flag is “2”, the media transfer model transferred from the media transfer control function unit 17 is confirmed (step s34).

  The following operations are performed according to the media transfer model confirmed in steps s32, s33, and s34.

  If the media transfer model is a termination model, the direction of the SIP / SDP signal is confirmed (step s35). If the SIP / SDP signal is transferred from the LAN side to the WAN side, the c / m-line of the SDP unit is used. The IP address / port number for receiving the media of the media terminal under the media transfer device described in the above is rewritten to the IP address / port number for receiving the media on the WAN side of the media transfer device, and passes through the B2BUA control function unit 13 In the case of a SIP / SDP signal transferred from the WAN side to the LAN side (step s36), the opposite media terminal described in the c / m-line of the SDP unit is transferred to the SIP stack control function unit 12 (step s36). IP address and port number for receiving media, and media on the LAN side of the media transfer device Rewriting the IP address and port number, and transfers the SIP stack control function unit 12 via the B2BUA control function unit 13 (step s37).

  The SIP stack control function unit 12 assembles the SDP unit transferred from the B2BUA control function unit 13 into a SIP signal, and in the case of a SIP / SDP signal transferred from the LAN side to the WAN side, the WAN of the media transfer device In the case of a SIP / SDP signal that is output to the LAN side and transferred from the WAN side to the LAN side, it is output to the LAN side of the media transfer apparatus.

  The opposite media terminal receives the SIP / SDP signal output to the WAN side of the media transfer apparatus, and the media terminal under the media transfer apparatus receives the SIP / SDP signal output to the LAN side of the media transfer apparatus. In this way, a session (communication) is established by exchanging SIP signals / SDP signals with each other between the media terminal under the media transfer apparatus and the opposite media terminal.

  After the session is established, the media transfer function unit 14 of the media transfer apparatus 10 transmits the media signal transferred from the WAN side to the IP address and port number for receiving the media on the WAN side of the media transfer apparatus. The media signal transferred from the LAN side to the IP address / port number for receiving the media of the terminal and transferred from the LAN side to the IP address / port number for receiving the media on the LAN side of the media transfer device is transferred to the media of the opposite media terminal. The received IP address / port number is transferred (step s38).

  If the media transfer model is a linked NAPT model, the direction of the SIP / SDP signal is confirmed (step s39). If the SIP / SDP signal is transferred from the LAN side to the WAN side, the c / m− The IP address / port number for receiving media of the media terminal under the media transfer device described in the line is rewritten to the IP address / port number for receiving media on the WAN side of the media transfer device, and the B2BUA control function unit 13 is changed. In the case of a SIP / SDP signal transferred to the SIP stack control function unit 12 via the WAN side (step s40) and transferred from the WAN side to the LAN side, the opposite media described in the c / m-line of the SDP unit The IP address / port number for receiving the media of the terminal is sent via the B2BUA control function unit 13 to S Transmitting transferred to P stack control function unit 12 (step s41).

  The SIP stack control function unit 12 assembles the SDP unit transferred from the B2BUA control function unit 13 into a SIP signal, and in the case of a SIP / SDP signal transferred from the LAN side to the WAN side, the WAN of the media transfer device In the case of a SIP / SDP signal that is output to the LAN side and transferred from the WAN side to the LAN side, it is output to the LAN side of the media transfer apparatus.

  The opposite media terminal receives the SIP / SDP signal output to the WAN side of the media transfer apparatus, and the media terminal under the media transfer apparatus receives the SIP / SDP signal output to the LAN side of the media transfer apparatus. In this way, a session (communication) is established by exchanging SIP signals / SDP signals with each other between the media terminal under the media transfer apparatus and the opposite media terminal.

  After the session is established, the media transfer function unit 14 of the media transfer apparatus 10 transmits the media signal transferred from the WAN side to the IP address and port number for receiving the media on the WAN side of the media transfer apparatus. The media signal transferred to the IP address and port number for receiving the media of the terminal and transferred to the IP address and port number for receiving the media of the opposite media terminal from the LAN side is transferred as it is (step s42).

  When the media transfer model is a routing model, the IP address / port number for receiving the media of the media terminal under the media transfer device described in the c / m-line of the SDP unit, and the media of the opposite media terminal Is transparently transferred to the SIP stack control function unit 12 via the B2BUA control function unit 13 (step s43).

  The SIP stack control function unit 12 assembles the SDP unit transferred from the B2BUA control function unit 13 into a SIP signal, and in the case of a SIP / SDP signal transferred from the LAN side to the WAN side, the WAN of the media transfer device In the case of a SIP / SDP signal that is output to the LAN side and transferred from the WAN side to the LAN side, it is output to the LAN side of the media transfer apparatus.

  The opposite media terminal receives the SIP / SDP signal output to the WAN side of the media transfer apparatus, and the media terminal under the media transfer apparatus receives the SIP / SDP signal output to the LAN side of the media transfer apparatus. In this way, a session (communication) is established by exchanging SIP signals / SDP signals with each other between the media terminal under the media transfer apparatus and the opposite media terminal.

  After the session is established, the media transfer function unit 14 of the media transfer device 10 transfers the media signal transferred from the WAN side to the IP address / port number for receiving the media of the media terminal under the media transfer device as it is. The media signal transferred to the IP address / port number for receiving the media of the opposite media terminal is transferred as it is (step s44).

  The effects of the present invention will be described below with reference to FIGS. 9, 10, and 11. In the figure, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals. That is, 10 is a media transfer device, 11 is a mode switching unit, 12 is a SIP stack control function unit, 13 is a B2BUA control function unit, 14 is a media transfer function unit, 20 is a home NW, and 30 is a voice call service opposite side. In-house NW, 40 is an external NW, 50 is an in-home NW on the opposite side of the image call service, 23, 33 and 53 are ONUs, 22 and 32 are voice call terminals, 24 and 52 are image call terminals, and 251 is a private address video. A distribution terminal, 252 is a video distribution terminal having a global address, and 611 and 612 are video distribution servers.

  Here, the voice call terminals 22 and 32 and the image call terminals 24 and 52 are terminals that need to take a termination model in order to provide a real-time call service. The video distribution terminal 251 is a terminal that needs to take a linked NAPT model because it is necessary to ensure transfer performance and to convert a global address and a private address. Furthermore, the video distribution terminal 252 is a terminal that needs to take a routing model because it needs to secure transfer performance and does not require conversion between a global address and a private address.

  As shown in FIG. 9, when only the terminal model voice call terminals 22 and 32 are used, it is not necessary to determine the media transfer method by selecting the batch fixed mode and specifying the terminal model. For this reason, it can be used without applying a determination load.

  Also, as shown in FIG. 10, when the terminal model voice call terminal 22, the linked NAPT model video distribution terminal 251 and the routing model video distribution terminal 252 are used, and the correspondence between the port and the terminal is fixed. By selecting the port designation mode and designating the correspondence between the port to be used and the media transfer model, it is not necessary to determine the media transfer method. For this reason, it can be used without applying a determination load.

  Further, as shown in FIG. 11, when a terminal model voice call terminal 22, a linked NAPT model video distribution terminal 251, and a routing model video distribution terminal 252 are used, there is a possibility of terminal replacement. In this case, by selecting the automatic mode, automatically selecting an appropriate model from the SIP signal and exchanging media, it is possible to simultaneously connect a plurality of media transfer system terminals without setting. it can.

  The mode selection section referred to in the claims is configured by the mode switching section 11 described above, and the batch fixed mode media transfer means described in the claims is configured by the mode switching section 11 and the media transfer function section 14 described above. The port designation mode media transfer means in the claims is constituted by the mode switching unit 11 and the media transfer function unit 14 described above, and the automatic mode media transfer means in the claims includes the mode switching unit 11 and the SIP stack control described above. The function unit 12, the B2BUA control function unit 13, and the media transfer function unit 14 are configured.

  The above-described media transfer apparatus can also be realized by installing a program having the procedures shown in the flowcharts of FIGS. 5 to 8 in a known computer via a medium or a communication line.

The block diagram which shows an example of embodiment of the media transfer apparatus of this invention Explanatory drawing which shows an example of the media service using the conventional media transfer apparatus Explanatory drawing which shows the other example of the media service using the conventional media transfer apparatus. Explanatory drawing which shows the further another example of the media service using the conventional media transfer apparatus. Operation flow chart of mode switching unit Operation flow chart of SDP processing function unit Operation flow chart of media transfer control function unit Operation flow chart of media transfer function unit The figure explaining the effect of this invention The figure explaining the other effect of this invention The figure explaining the further another effect of this invention.

Explanation of symbols

  10: Media transfer device, 11: Mode switching unit, 12: SIP stack control function unit, 13: B2BUA control function unit, 14: Media transfer function unit, 15: B2BUA processing function unit, 16: SDP processing function unit, 17: Media transfer control function part.

Claims (4)

A media transfer method for performing media transfer by a plurality of different media transfer methods using a computer,
In the computer,
In addition to the selection input for the operation mode of the batch fixed mode, port specification mode, or automatic mode, the media transfer method specification input is specified for the batch fixed mode, and the media signal input port for the port specification mode. Receiving a designated input of a corresponding media transfer method;
When the batch fixed mode is selected and input, the step of performing media transfer by the specified input media transfer method;
When the port designation mode is selected and input, performing media transfer according to the media transfer method specified and input corresponding to a port to which a media signal is input; and
When the automatic mode is selected and input, the media transfer method is determined by analyzing the SIP / SDP signal before the media transfer, and transfer information necessary for the media transfer is extracted from the SDP unit according to the determined media transfer method, A media transfer method comprising: performing a media transfer method and a step of performing media transfer according to transfer information. A media transfer device that performs media transfer by a plurality of different media transfer methods,
In addition to the selection input for the operation mode of the batch fixed mode, port specification mode, or automatic mode, the media transfer method specification input is specified for the batch fixed mode, and the media signal input port for the port specification mode. A mode selection unit that accepts designation input of the corresponding media transfer method;
When the batch fixed mode is selected and input, the batch fixed mode media transfer means for performing the media transfer by the designated input media transfer method;
When port designation mode is selected and input, port designation mode media transfer means for carrying out media transfer according to the designated and inputted media transfer method corresponding to a port to which a media signal is input;
When the automatic mode is selected and input, the media transfer method is determined by analyzing the SIP / SDP signal before the media transfer, and the transfer information necessary for the media transfer is extracted from the SDP unit according to the determined media transfer method, An automatic mode media transfer means for performing media transfer according to a media transfer method and transfer information. A media transfer device that performs media transfer using a plurality of different media transfer methods,
The mode switching unit, the SIP stack control function unit, the B2BUA control function unit, and the media transfer function unit,
The mode switching unit inputs the selection of the operation mode from the batch fixed mode, port designation mode, and automatic mode, as well as the media transfer method designation input for the batch fixed mode and the media signal for the port designation mode. When the designated input of the port to be transferred and the corresponding media transfer method is received, and the batch fixed mode is selected and input, the designated media transfer method is transferred to the media transfer function unit and a flag set to “0” is set. When the port designation mode is selected and input, the port to which the designated input media signal is input and the media transfer method corresponding to the port are transferred to the media transfer function unit. In addition, the flag set to “1” is set to the SIP stack control function part and Transferred to media transfer function unit, if the automatic mode is selected and input with the function of transferring the set a flag in SIP stack control function and a media transfer function unit to "2",
The SIP stack control function unit has a function to transfer the SIP / SDP signal before media transfer to the B2BUA control function unit only when the flag set to “2” is received,
The B2BUA control function unit extracts the SDP unit from the SIP / SDP signal transferred from the SIP stack control function unit, analyzes the information of the extracted SDP unit, determines the media transfer method, and determines the determined media transfer A function of extracting transfer information necessary for media transfer from the SDP unit according to a method, and transferring the extracted transfer information to the media transfer function unit together with the determined media transfer method;
When the media transfer function unit receives the flag set to “0”, the media transfer function unit performs media transfer according to the media transfer method transferred from the mode switching unit, and receives the flag set to “1”. The media transfer is performed by the media transfer method corresponding to the port to which the media signal transferred from the mode switching unit is input and the port to which the media signal to be transferred among the media transfer methods corresponding to the port is input. A media transfer device comprising a function of performing media transfer according to a media transfer method and transfer information transferred from the B2BUA control function unit when a flag set in the above is received.   The program for making a computer implement | achieve each function of Claim 3.

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