JP4555005B2 - Protocol conversion server - Google Patents

Description

  The present invention relates to a SIP conversion server for transmitting / receiving information between information processing apparatuses adopting different protocols, and more particularly to a protocol conversion server capable of transmitting / receiving information without going through a protocol conversion GW.

  FIG. 7 shows a configuration of a conventional IPv4 / IPv6 conversion GW system. The conventional IPv4 / IPv6 conversion GW system includes an information processing terminal 1, a SIP call processing device 3, a SIP conversion device 8, a SIP call processing device 9, and an information processing terminal 2.

  The information processing terminal 1 is a SIP terminal compatible with IPv4. The information processing terminal 2 is a SIP terminal compatible with IPv6, and is connected to an IPv6 network. The SIP call processing device 3 is generally called a SIP server and performs an operation compliant with SIP, and includes a message management unit 31 and a routing unit 36. The message management unit 31 receives an SIP message from an external device (such as the information processing terminal 1), accumulates the message in a memory in the SIP call processing device 3, determines a transfer destination by the routing unit 36, and transfers the transfer destination. Send a SIP message to The routing unit 36 analyzes a message stored in the memory of the SIP call processing device 3 and determines a transfer destination. Here, the SIP converter 8 is assumed to be the transfer destination.

  The SIP conversion apparatus 8 includes a message management unit 81, an IPv4 / IPv6 conversion unit 82, and a conversion correspondence table 83. The message management unit 81 receives the SIP message of the external device (SIP call processing device 3 or the like), stores it in the memory in the SIP conversion device 8, and transmits the SIP message to the transfer destination. The IPv4 / IPv6 conversion unit 82 converts the IP header information of the message and the IPv4 information in the SIP information into IPv6 information. Also, the IPv6 information is converted into IPv4 information. The conversion is performed with reference to a conversion correspondence table 83 in which conversion source information and conversion destination information are registered in advance.

The SIP call processing device 9 includes a message management unit 91 and a routing unit 96.
The message management unit 91 receives the SIP message of the external device (SIP conversion device 8 or the like), stores it in a memory (not shown) in the SIP call processing device 9, and transmits the SIP message to the information transfer destination. The routing unit 96 analyzes the message stored in the memory of the SIP call processing device 9 and develops information of the information processing terminal 2 that is a transfer destination.

  The transmission of the SIP message to the information processing terminal 2 in the conventional IPv4 / IPv6 GW has to go through the SIP call processing device 9 registered in the conversion correspondence table 83. For this reason, in the conventional IPv4 / IPv6 conversion of SIP, a SIP conversion GW is installed between the IPv4 SIP server and the IPv6 SIP server.

As described above, as a conventional technique related to a method for performing protocol conversion via a relay apparatus in which the definition of the protocol conversion process is registered in advance, the “address notification method” disclosed in Patent Document 1 and Patent Document 2 are disclosed. There are “address translation apparatus, message processing method and apparatus”, “packet transmission / reception node and packet transmission / reception method” disclosed in Patent Document 3, and the like.
JP 2002-1111738 A JP 2003-174466 A JP 2003-188925 A

  In the communication protocol called SIP, information on whether the called terminal is compatible with IPv4 or IPv6 is held by the called SIP server, and the calling SIP server knows the information. It is not possible. For this reason, the originating SIP server cannot determine whether to transmit via the SIP conversion GW or not.

  Therefore, when different versions of IP are used on the calling side and the called side, there arises a problem that the media session cannot be started unless the SIP server goes through the SIP conversion GW. The reason is that the SIP service performs call control via the SIP server, and media sessions such as audio / video are performed directly between terminals without going through the SIP server. This is because the session cannot be executed. Therefore, it is necessary to provide a SIP conversion GW between terminals using different IPs to convert the media IP.

  Therefore, conventionally, when a user uses a SIP service from both IPv4 and IPv6 networks, two types of SIP-URI are prepared for each user, one for IPv4 and one for IPv6, and the SIP server has its SIP-URI. To determine whether or not to pass through the SIP conversion GW.

  Further, it is necessary to prepare a table of IP addresses to be converted in the SIP conversion GW. The table includes, for example, an entry for converting an IPv4 address “A” into an IPv6 address “B”. This method has a problem that it takes time and effort to determine the version of the IP currently used by the user and to use the SIP-URI properly.

Furthermore, it is necessary to operate the routing of the SIP server and associate the SIP-URI with the SIP conversion GW.
In addition, it is necessary to prepare a table of IP addresses to be converted in the SIP conversion GW, and it is necessary to increase the number of entries by the number of SIP servers connected to the SIP conversion GW, which is troublesome.

When a SIP message is transmitted, it must pass through a SIP call processing device registered in the conversion exchange table.
(1) Since the conversion correspondence table is managed in units of servers, it cannot be handled in units of receiving terminals.
(2) Since the SIP conversion device needs to recognize the connection destination SIP call processing device in a fixed manner, it is necessary to change the conversion correspondence table every time the SIP call control device is added / reduced.
(3) When the SIP call processing device 9 is changed to IPv4-IPv6, the receiving terminal is changed to an IPv6-compatible device. In this case also, it is necessary to update the correspondence conversion table.

  These problems are the same even for communication protocols other than SIP, and the invention disclosed in each of the above patent documents is the same as the communication protocol of the originating information processing apparatus and the communication protocol of the terminating information processing apparatus. Regardless of whether or not, communication is not possible unless the conversion law is passed through a device (GW) registered as a table.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a protocol conversion server that can mediate communication between information processing terminals without being aware of the type of communication protocol on the calling side on the calling side.

In order to achieve the above object, the first protocol conversion server of the present invention is a protocol conversion that mediates communication between at least one information processing terminal directly connected and another information processing terminal indirectly connected. Specific to each information processing terminal acquired from the directly connected information processing terminal when it is requested to mediate communication between the directly connected information processing terminal and the indirectly connected information processing terminal. registration of a is terminal ID and IP address information, has a terminal information management means for deleting the communication from the information processing terminal the mediation of the requested communication is indirectly connected to the directly connected information processing terminal If the communication protocol of the destination information processing terminal matches the communication protocol of the information processing terminal of the transmission source, the transmission source information processing terminal The data received from the converting to the communication protocol to adapt to the destination information processing terminal, also of a is you and transmitting the data obtained by converting the communication protocol to a destination information processing terminal.

  In any of the above configurations of the present invention, the header information of the data acquired from the transmission source information processing terminal is analyzed, and whether the communication protocol of the transmission source information processing terminal matches the communication protocol of the destination information processing terminal. It is preferable to determine whether or not.

  In any of the above configurations of the present invention, it is preferable that one of the communication protocol of the information processing terminal directly connected and the communication protocol of the other information processing terminal indirectly connected is IPv4 and the other is IPv6. . Alternatively, it is preferable that one of the communication protocol of the information processing terminal directly connected and the communication protocol of the other information processing terminal indirectly connected is the global IP of IPv4 and the other is the private IP of IPv4.

  In any of the above configurations of the present invention, the information processing terminal is preferably a SIP terminal.

  ADVANTAGE OF THE INVENTION According to this invention, the protocol conversion server which can mediate communication between information processing terminals can be provided, without being conscious of the kind of communication protocol of a callee side at the transmission side.

[First Embodiment]
A first embodiment in which the present invention is preferably implemented will be described. FIG. 1 shows the configuration of an IPv4 / IPv6 conversion system according to the present embodiment. This system includes an information processing terminal 1, an information processing terminal 2, a SIP call processing device 3, and a SIP call processing conversion device 4.

  Here, the SIP terminal is compliant with SIP (IETF RFC3261), such as a hard phone such as a telephone (fixed phone, mobile phone), a soft phone configured by software processing on a computer terminal or PDA, or the like There is. Further, a combination of VoIP-TA (which converts an analog telephone to VoIP) and an analog telephone is also included.

  The information processing terminal 1 is a SIP terminal compatible with IPv4. The information processing terminal 2 is an SIP terminal compatible with IPv4 / v6, and is connected to an IPv6 network.

The SIP call processing device 3 is a device that performs an operation compliant with SIP, and is generally called a “SIP server”. The SIP call processing device 3 includes a message management unit 31 and a routing unit 32.
The message management unit 31 receives a SIP message from an external device (such as the information processing terminal 1), accumulates the message in a memory (not shown) in the SIP call processing device 3, and determines a transfer destination using the routing unit 32. The SIP message is transmitted to the transfer destination. The routing unit 32 analyzes a message stored in a memory (not shown) of the SIP call processing device 3 and determines a transfer destination of the SIP message. Here, it is assumed that the transfer destination of the SIP message is the SIP call processing conversion device 4.

  The SIP call processing conversion device 4 includes a message management unit 41, an IPv4 / IPv6 conversion unit 42, a subscriber management unit 43, a media information operation unit 44, and a call control unit 45.

The message management unit 41 receives a message from an external device (SIP call processing device 3 or the like), accumulates it in a memory (not shown) in the SIP call processing conversion device 4, and uses the subscriber management unit 43 to transfer the destination. And the SIP message is transmitted to the transfer destination.
The IPv4 / IPv6 conversion unit 42 converts the IP header information of the message and the IPv4 information in the SIP information into IPv6. Conversely, IPv6 information is converted into IPv4 information. Furthermore, in the case of IPv4, it also has a function of converting private IP information and global IP information.

  The subscriber management unit 43 holds terminal information to be accommodated, and provides specific subscriber information in response to a request from the message management unit 41.

  The media information operation unit 44 has a control function of the external media device.

  The call control unit 45 has a state management and control function in connection of the SIP session.

The operation of the IPv4 / IPv6 conversion system according to this embodiment will be described.
In order to establish a SIP session, two phases of a register phase (Register Phase) and an invite phase (Invite Phase) are required.
First, the register phase will be described. The register is one of SIP procedures, and is a process for registering the SIP user authentication and the SIP terminal address in the SIP server. Since this process itself is a known technique, detailed description thereof is omitted.

Here, it is assumed that the register is assigned to the SIP call processing conversion device 4 from the receiving terminal 2.
The information processing terminal 2 transmits SIP user registration information to the SIP call processing conversion device 4 (step S101). The SIP call processing conversion device 4 receives the user registration information from the information processing terminal 2 (step S102). The message management unit 41 determines whether or not authentication processing is necessary based on the received data (step S103). If necessary (step S103 / Yes), the subscriber management unit 43 performs authentication processing (step S103). S104). After the authentication process or when authentication is not required (step S103 / No), the register registration / deletion is determined as the received data content (step S105). If the information is to be registered (step S105 / Yes), the register information is saved by the subscriber management unit 43 (step S107). If the information is to be deleted (step S105), the subscriber management unit 43 deletes the register information (step S106). When the registration / deletion of information is completed, the SIP call processing conversion device 4 transmits a SIP message to the information processing terminal 2 to notify the processing result (step S108). When the information processing terminal 2 receives this message (step S109), the register phase processing is completed.

Next, the process of the invite phase will be described. Invite is one of the procedures in SIP. In order to establish a SIP session between SIP terminals, routing is performed based on the routing table of the SIP server, and the SIP message is delivered to the address of the SIP terminal at the time of registration. It is.
Here, as the establishment of the SIP session by the invite, the information processing terminal 1 or the information processing terminal 2 transmits the SIP invite information (step S201). The SIP call processing conversion device 4 acquires the invite information sent from the information processing terminal 1 or the information processing terminal 2 (step S202). The message management unit 41 determines the processing type based on the received data (step S203), and if it is a receiving process (the information processing terminal 1 is the source of the invite information) (step S203 / the receiving process), the subscription The subscriber management unit 43 collects subscriber information and compares the IP version of the information processing terminal 1 with the IP version of the information processing terminal 2 (step S205). When the IP versions are different (step S205 / different), the IPv4 / IPv6 conversion unit 42 executes an IPv4 / IPv6 conversion process (step S206). Next, a media information control process is executed by the media information operation unit 44 (step S207).
After the media information control process, or when the process type is the originating process (the information source terminal 2 is the source of the invite information) (step S203 / issuing process), or when the IP versions match (step S205 / same) Then, the SIP message editing process is executed by the message management unit 41 (step S208), and the SIP message is transmitted (step S209). When the information processing terminal 2 receives the invite information transmitted from the SIP call processing conversion device 3, the operation in the invite phase is completed.

Although the case where the information processing terminal 1 corresponds to IPv4 and the information processing terminal 2 corresponds to IPv6 has been described here as an example, the same applies to the case where the information processing terminal 1 corresponds to IPv6 and the information processing terminal 2 corresponds to IPv4. Processing is possible.
In the case of IPv4 private IP and global IP, the same processing as above can be performed by replacing IPv4 with private IP and IPv6 with global IP in the above example.

Thus, the IPv4 / IPv6 conversion system according to the present embodiment has a special function even when IPv4 and IPv6 are mixed when the caller terminal makes a call to the SIP terminal accommodated in the SIP call processing conversion device. SIP communication can be established without using. This is because the SIP call processing conversion device 4 executes conversion processing based on the subscriber information registered by the SIP register function, and the converted information can be analyzed by the called party terminal.
Further, when the called party terminal shifts from IPv4 to IPv6, the telephone operator change procedure and the subscriber data transfer procedure required for switching the telephone are not required.
This is because the SIP server can register both IPv4 and IPv6 as the subscriber information registered by the SIP register function.

[Second Embodiment]
An IPv4 / IPv6 conversion system according to a second embodiment in which the present invention is preferably implemented will be described. FIG. 4 shows the configuration of the IPv4 / IPv6 conversion system according to the present embodiment. This system includes an information processing terminal 5, an information processing terminal 6, a SIP call processing device 3, and a SIP call processing conversion device 4.

  The information processing terminal 5 and the information processing terminal 6 are the same as the information processing terminal 1 and the information processing terminal 2 in the first embodiment. The SIP call processing device 3 is the same as that in the first embodiment.

The SIP call processing conversion device 4 includes a message management unit 41, an IPv4 / IPv6 conversion unit 42, a subscriber management unit 43, a media information operation unit 44, a call control unit 45, and a routing unit 46. The message management unit 41, IPv4 / IPv6 conversion unit 42, subscriber management unit 43, media information operation unit 44, and call control unit 45 are the same as in the first embodiment.
Based on the access destination information described in the SIP-URI in the SIP message acquired by the routing unit 46 and the message management unit 41, the IP address of the routing destination server is analyzed, and the message management unit 41 is requested to transfer the SIP message.

  In the IPv4 / IPv6 conversion system according to the present embodiment, the internal configuration of the SIP call processing conversion control unit 4 is different from that of the first embodiment. Based on the access destination information acquired by the routing unit 46, the conversion unit 45 Whether conversion is necessary or not is determined, and when conversion is required, IPv4 / IPv6 conversion is performed.

The operation of the IPv4 / IPv6 conversion system according to this embodiment will be described. Since the processing in the register phase is the same as that in the IPv4 / IPv6 conversion system according to the first embodiment, description thereof is omitted. FIG. 5 shows a flow of processing in the invite phase of the IPv4 / IPv6 conversion system according to the present embodiment.
In order to establish a SIP session by invitation, the information processing terminal 5 transmits SIP invitation information (step S301). The SIP call processing device 3 receives the invite information from the information processing terminal 5 (step S302). The message management unit 41 determines the processing type based on the received invite information (step S303), and if it is an outgoing process, the routing unit 46 detects the server information of the routing destination (step S304). Next, the IPv4 / IPv6 conversion unit 42 compares the IP version of the information processing terminal 5 with the IP version of the server that is the routing destination, and determines whether or not the IPv4 / IPv6 conversion is necessary (step S305). The IPv6 / IPv4 conversion unit 42 converts the IP only when it is determined that the IPv4 / IPv6 conversion is necessary. The subsequent processing is the same as the processing after step S205 in the first embodiment, and a description thereof will be omitted.

  In addition, the case of the arrival process is the same as that of the first embodiment, and the description thereof is omitted.

Each of the above embodiments is an example of a preferred embodiment of the present invention, and the present invention is not limited to these.
For example, in each of the above embodiments, the operation has been described by taking the case of conversion between IPv4 and IPv6 as an example. However, the present invention is not limited to this, and conversion between private IP of IPv4 and global IP is performed. In the case of, IP conversion can be performed in the same manner.
Also, here, the description has been given by taking as an example the configuration in which the originating information processing terminal is connected to the SIP call processing device having the same configuration as the conventional one, but as shown in FIG. 6, the originating information processing terminal Are preferably connected to the SIP call processing conversion processing device according to each of the above embodiments. In this case, the information processing terminal 1 also registers register information in the SIP call processing conversion device 7 in the same manner as the information processing terminal 2. In this way, both communication from the information processing terminal 1 to the information processing terminal 2 and communication from the information processing terminal 2 to the information processing terminal 1 can be performed without considering each other's communication protocol.
Thus, the present invention can be variously modified.

It is a figure which shows the structure of the IPv4 / IPv6 conversion system concerning 1st Embodiment which implemented this invention suitably. It is a flowchart which shows the flow of a process in the register phase of the IPv4 / IPv6 conversion system concerning 1st Embodiment. It is a flowchart which shows the flow of a process in the invite phase of the IPv4 / IPv6 conversion system concerning 1st Embodiment. It is a figure which shows the structure of the IPv4 / IPv6 conversion system concerning 2nd Embodiment which implemented this invention suitably. It is a figure which shows the flow of a process in the invite phase of the IPv4 / IPv6 conversion system concerning 2nd Embodiment. It is a figure which shows another structural example of an IPv4 / IPv6 conversion system. It is a figure which shows the structure of the conventional IPv4 / IPv6 conversion system.

Explanation of symbols

1, 2, 5, 6 Information processing terminal 3, 9 SIP call processing device 4, 7 SIP call processing conversion device 8 SIP conversion device 31, 41, 71 Message management unit 36, 46, 76 Routing unit 42, 72 IPv4 / IPv6 Conversion unit 43, 73 Subscriber management unit 44, 74 Media information operation unit 45, 75 Call control unit

Claims (5)

A protocol conversion server that mediates communication between at least one information processing terminal directly connected and another information processing terminal indirectly connected;
Information specific to each information processing terminal acquired from the directly connected information processing terminal when mediation of communication between the directly connected information processing terminal and the indirectly connected information processing terminal is requested. Having terminal information management means for registering and deleting a certain terminal ID and IP address ;
If the requested mediation of communication is communication from the indirectly connected information processing terminal to the directly connected information processing terminal, the communication protocol of the information processing terminal that is the destination and the information that is the transmission source It is determined whether or not the communication protocol of the processing terminal matches, and if not, the data received from the transmission source information processing terminal is converted to a communication protocol adapted to the destination information processing terminal, and the communication protocol is A protocol conversion server characterized by transmitting converted data to a destination information processing terminal. Analyzing header information of data acquired from the transmission source information processing terminal, and determining whether or not the communication protocol of the transmission source information processing terminal and the communication protocol of the destination information processing terminal match. The protocol conversion server according to claim 1. 3. One of the communication protocol of the information processing terminal that is directly connected and the communication protocol of the other information processing terminal that is indirectly connected is IPv4, and the other is IPv6 . Protocol conversion server. One of the communication protocol of the information processing terminal directly connected and the communication protocol of the other information processing terminal indirectly connected is a global IP of IPv4, and the other is a private IP of IPv4. Item 3. The protocol conversion server according to Item 1 or 2 . The information processing terminal, the protocol conversion server according to any one of claims 1 4, characterized in that the SIP terminal.

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