JP2009049559A - Message repeater, and message relay system and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a message repeater for enabling both a transmitting side and a receiving side to exchange messages while concealing address information of their own communication terminals. <P>SOLUTION: The message repeater 120 is provided with a message receiving part 122 for receiving a message received from a communication device, a relay information database 128 for storing a relay information for associating a relay address to be used to exchange messages between a plurality of communication devices with addresses of the plurality of communication devices for using the relay address to exchange the messages, a relay information acquisition part 126 for acquiring from the relay information database 128 relay information including a relay address coinciding with a transmission destination address of a message, a message rewriting part 132 for rewriting the transmission destination address and a transmission source address of the message on the basis of the relay information, and a message transmitting part 124 for transmitting a rewritten message to a transmission destination after rewriting the message. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a message relay device, a message relay system, and a program.

  In general, when performing communication by telephone, a caller can make a call to a target party by dialing the telephone number of the other party to be called. That is, it is assumed that the caller needs to know the telephone number of the other party who wants to make a call in advance, and that the callee notifies the caller in advance of his / her number. In addition, as a service for identifying who the incoming call is from before the caller answers the call, there is a caller number notification service. This is a service that sends the caller's phone number from the caller's communication device or line to the callee's communication device. When a call is received, the caller number is displayed on the display etc. of the callee's communication device. Can be displayed.

  On the other hand, even when it is necessary to communicate by telephone, there are cases where it is not desired to inform the other party of his / her telephone number. For example, when a transaction is established at an online auction, etc., the seller and the successful bidder usually need to notify each other's contact information, but in most cases the seller and the successful bidder do not know each other For this reason, there is a case where it is not desirable to notify personal information such as a telephone number if possible from the viewpoint of privacy protection.

  As a technique that can be used in such a case, in Patent Document 1, by setting a temporary telephone number to a telephone having a subscriber number, communication is performed using a selected telephone without notifying the subscriber number. A communication system is disclosed that enables Patent Document 2 discloses a communication device that enables a caller to make a telephone call while concealing his / her IP address in a message exchange using a session initiation protocol (SIP) used in VoIP. .

JP 2004-180273 A JP 2004-228829 A

  In the service described in Patent Document 1, since a caller cannot make a call using a temporary phone number, when the caller number notification is made, his / her phone number is notified to the callee side. There's a problem. With regard to this, it is possible to make a call without notifying the other party of the call number by making a setting so that the caller does not notify the number. Since the caller cannot be specified, it cannot be distinguished from a prank call or the like. Therefore, when a call is sent without notification, the callee may refuse to respond to the call or receive the call itself.

  On the other hand, according to the method described in Patent Document 2, the caller can make a call while hiding his identity (IP address). However, in the method described in Patent Document 2, messages cannot be exchanged when the called party does not notify the IP address. As described above, communication by telephone cannot be performed in a state where both the calling party and the receiving party completely hide their telephone numbers.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to exchange messages in a state where both the calling side and the called side hide the address information of their communication terminals. It is an object of the present invention to provide a new and improved message relay system, message relay apparatus, and program that can be performed.

  In order to solve the above problems, according to an aspect of the present invention, a message relay device for relaying message exchange between a plurality of communication devices, wherein the message reception device receives a message transmitted from the communication device. A relay information database for storing relay information for associating a relay address used for exchanging messages between a plurality of communication devices and addresses of a plurality of communication devices exchanging messages using the relay addresses; The relay information acquisition unit that acquires the relay information including the relay address that matches the transmission destination address of the message from the relay information database, and the message transmission destination address and the transmission source based on the relay information acquired by the relay information acquisition unit The message rewriting unit that rewrites the address and the message rewriting unit And the message, the message relay device comprising: a message transmitting section, the to be transmitted to the destination of the rewritten message is provided.

  Further, the message rewriting unit may rewrite the message transmission destination address to an address other than the communication device that is the message transmission source among the addresses of the plurality of communication devices included in the relay information.

  Further, the message rewriting unit may rewrite the message source information to the relay address.

  Moreover, you may make it further provide the relay judgment part which judges whether the message received by the message receiving part is relayed. The relay determination unit may determine not to relay the message when the relay information acquired by the relay information acquisition unit does not include the message source address.

  The relay information may further include relay period information indicating a period in which a plurality of communication devices can exchange messages using the relay address. At this time, the relay determination unit may determine that the message is not relayed if the relay period information is not applicable.

  In addition, when the relay determination unit determines not to relay the message, the relay determination unit may notify the message transmission source that the message is not relayed.

  In order to solve the above problem, according to another aspect of the present invention, a message relay for relaying a message exchange between a communication device used by a user to transmit and receive a message and a plurality of communication devices. And a message relay system. The message relay device includes a message receiving unit that receives a message transmitted from a communication device, a relay address that is used to exchange messages between the plurality of communication devices, and a plurality of messages that exchange messages using the relay addresses. A relay information database that stores relay information that associates addresses of communication devices, a relay information acquisition unit that acquires relay information that includes a relay address that matches a destination address of a received message from the relay information database, and a relay information acquisition unit A message rewriting unit that rewrites the transmission destination address and the source address of the message based on the relay information acquired by the message rewriting unit, and a message transmission unit that transmits the message rewritten by the message rewriting unit to the transmission destination after the message rewriting It is characterized by providing.

  In order to solve the above problem, according to another aspect of the present invention, a computer is a message relay device for relaying message exchange between a plurality of communication devices, and is transmitted from the communication device. Stores relay information for associating a message receiving unit that receives a message, a relay address used for exchanging messages between a plurality of communication devices, and addresses of a plurality of communication devices that exchange messages using the relay address Based on the relay information database, the relay information acquisition unit that acquires the relay information including the relay address that matches the transmission destination address of the received message from the relay information database, and the relay information acquired by the relay information acquisition unit, A message rewriting unit that rewrites the destination address and source address, and a message The rewritten message by section, and a message transmitting unit that transmits the transmission destination after rewriting message, the program to function as the message relay device comprising is provided.

  As described above, according to the present invention, it is possible for both the sending side and the receiving side to exchange messages while concealing the address information of their communication terminals.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  First, a telephone relay system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a schematic configuration of a telephone relay system 100 according to an embodiment of the present invention.

As shown in FIG. 1, the telephone relay system 100 according to the present embodiment includes a message relay device 120, a SIP proxy server 140, and two communication terminals 160 and 180. The telephone relay system 100 is a system used for performing communication by an IP telephone using a Session Initiation Protocol (SIP) for signaling. Two users who use the telephone relay system 100 exchange SIP messages using the communication terminal 160 and the communication terminal 180, respectively. In the exchanged SIP message, information on the session such as a transmission source address and a transmission destination address is described. The actual call voice is RTP (Real-time) as a voice signal digitized by a separately defined codec.
It is transmitted by a protocol such as Transport Protocol.

  Here, the transmission source address and the transmission destination address included in the SIP message are identification information assigned to each user's communication terminal, such as a telephone number, an IP address, a SIP-URI (Session Initiation Protocol-Uniform Resource). Indicator). Communication terminals that make a call using the telephone relay system 100 register their addresses in the message relay device 120 in advance, and receive a relay address (hereinafter referred to as a relay address) used when making a call. The relay address is a unique address given to each set of communication terminals registered in the message relay apparatus 120, and each communication terminal makes a call using the given relay address.

  Specifically, when making a call from one of the registered communication terminals, the call is made by specifying a relay address instead of the address of the other communication terminal. On the other hand, the communication terminal that receives the incoming call is notified of the source address when receiving the incoming call, but the notification is not the address of the communication terminal of the calling side but the relay address. Therefore, both the calling side and the receiving side can make and receive calls by recognizing and using the relay address as the address of the other party without knowing the actual address of the other party.

  In this embodiment, it is assumed that one relay address is given to one set of addresses of two registered communication terminals by two communication terminals, but this is an example, Three or more communication terminals may be registered as one group, and one relay address may be given to one group.

  Hereinafter, each apparatus which comprises the telephone relay system 100 which concerns on this embodiment is demonstrated.

<Message Relay Device 120>
The message relay device 120 is a device for relaying messages between the communication terminal 160 and the communication terminal 180. FIG. 2 is a block diagram illustrating a schematic configuration of the message relay device 120. As shown in FIG. 2, the message relay device 120 includes a receiving unit 122, a transmitting unit 124, a relay information acquiring unit 126, a relay information database 128, a relay determining unit 130, and a message rewriting unit 132. The Hereinafter, functions of each unit of the message relay device 120 will be described.

(Receiver 122, transmitter 124)
The reception unit 122 receives SIP messages transmitted from the user communication terminals 160 and 180 via the SIP proxy server 140 and inputs the received messages to the relay information acquisition unit 126. The transmission unit 124 transmits the message input from the message rewriting unit 132 or the relay determination unit 130 to the communication terminal 160 or 180 via the SIP proxy server 140.

(Relay Information Acquisition Unit 126, Relay Information Database 128)
When the SIP information is received from the communication terminal 160 or 180, the relay information acquisition unit 126 acquires the relay information stored in the relay information database 128 in order to determine which communication terminal to transfer the message to. The relay information database 128 is a storage unit for storing the relay information.

  Here, the relay information is information for associating the source address and destination address included in the message with the address of the communication terminal to which the message is to be transferred. FIG. 3 is a diagram illustrating an example of relay information stored in the relay information database 128. As shown in FIG. 3, the relay information stored in the relay information database 128 includes a relay address and addresses (address 1, address 2) of two communication terminals that exchange messages using the relay address. . In addition to the above, the relay information may include information indicating conditions for relaying, for example, information such as a transfer period.

  The relay information acquisition unit 126 extracts a transmission destination address from the received SIP message. Since all messages transmitted to the message relay device 120 are messages in which the relay address is specified as the transmission destination address, the transmission destination address extracted here is the relay address. The relay information acquisition unit 126 searches the relay information database 128 based on the relay address specified as the transmission destination address, and acquires the relay information corresponding to the relay address. For example, when a message in which “0A-AAAA-AAAA” is specified as the transmission destination address is received, the relay information acquisition unit searches the relay information database 128 using “0A-AAAA-AAAA” as a key. The addresses “0X-XXXX-XXXX” and “0Y-YYYY-YYYY” of the two communication terminals having the relay address “-AAAA-AAAA” are acquired.

(Relay determination unit 130)
The relay determination unit 130 determines whether to relay the received message based on the relay information acquired by the relay information acquisition unit 126. For example, when “0X-XXXX-XXXX” and “0Y-YYYY-YYYY” are acquired as the communication terminal addresses for the relay address “0A-AAAA-AAAA”, the relay determination unit 130 transmits the received message. If the original address corresponds to one of the two addresses, it is determined that relaying is possible, and if it does not correspond to any of the two addresses, it is determined that relaying is not possible. In other words, if the message destination address is “0A-AAAA-AAAA” and the source address is either “0X-XXXX-XXXX” or “0Y-YYYY-YYYY”, relaying is possible, and the source address is If it is neither, it is determined that relaying is not possible. As a result, it is possible to prevent the terminals other than the two communication terminals that have been registered with the message relay apparatus 120 from issuing the relay address from making a call using the relay address.

  In addition, when a condition for performing relay such as a transfer period is set in the relay address as in another example “0B-BBBB-BBBB” of the relay address in FIG. It may be determined whether relaying is possible or not by determining whether or not the above is satisfied. For example, in the case of the example of the relay address “0B-BBBB-BBBB”, since the transfer period is set as July 1 to July 10, 2007, the relay determination unit 130 determines whether or not the relay address is from July 1, 2007. Messages received during July 10 are determined to be relayable, and messages received before or after that are determined to be unrelayable.

  When it is determined that the message can be relayed, the relay determination unit 130 inputs the message to the message rewriting unit 132. If relay determination unit 130 determines that relaying is not possible, relay determination unit 130 may create a message indicating that relaying could not be performed and transmit the message to the transmission source communication terminal.

(Message rewriting unit 132)
The message rewriting unit 132 rewrites the transmission source / destination address of the message based on the relay information acquired by the relay information acquisition unit 126. Specifically, the message rewriting unit 132 rewrites the message source address to the relay address, and rewrites the destination address to the address of the communication terminal registered in the relay information as the communication partner of the source communication terminal.

  Referring again to the example of relay information in FIG. 3, for example, in the case of a message whose source address is “0X-XXXX-XXXX” and whose destination address is “0A-AAAA-AAAA”, the message rewriting unit 132 The source address is rewritten to the relay address “0A-AAAA-AAAA”, and the destination address is rewritten to “0Y-YYYY-YYYY”. As a result, the message transmitted with the relay address “0A-AAAA-AAAA” specified as the transmission destination can be transferred to the communication terminal having the address “0Y-YYYY-YYYY”. In addition, since the source address of the forwarded message is rewritten to the relay address “0A-AAAA-AAAA”, the true source address “0X-XXXX-XXXX” is notified to the communication terminal that receives the message. This can be prevented. On the other hand, the receiving terminal knows that the relay address “0A-AAAA-AAAA” is the address when communicating with the communication terminal having the address “0X-XXXX-XXXX”. By looking at the source address “0A-AAAA-AAAA”, it is possible to identify the other party who sent the message.

  The configuration of the message relay device 120 has been described above. The receiving unit 122, the transmitting unit 124, the relay information acquiring unit 126, the relay determining unit 130, and the message rewriting unit 132 are realized by installing a software program that executes the functions of these units in the message relay device 120. It is also possible to implement this with dedicated hardware. The software program may be executed by reading out a program stored in a computer-readable storage medium, or may be provided to the message relay device 120 via a network or the like. . In addition, the relay information database 128 may be configured by various storage media such as a semiconductor memory, an optical disk, and a magnetic disk, for example.

<SIP proxy server 140>
The SIP proxy server 140 is a server for relaying communication between the message relay device 120 and the communication terminal 160 and between the message relay device 120 and the communication terminal 180. When the SIP proxy server 140 receives the SIP message from the communication terminal 160 or the communication terminal 180, the SIP proxy server 140 transfers the message to the message relay device 120 when the transmission destination address included in the message is a pre-registered relay address. . When a message is received from the message relay device 120, the message is transferred to the communication terminal indicated by the transmission destination address included in the message.

<Communication terminals 160 and 180>
Communication terminals 160 and 180 are communication terminals used by a user who makes a call using the telephone relay system 100. Communication terminals 160 and 180 are devices having a function that enables communication by IP telephone using SIP. In addition, the communication terminals 160 and 180 include, for example, an input unit such as a button and a keyboard for inputting a telephone number of the other party, a display unit such as a display for displaying a message transmitted from the message relay device 120, and the like. You may prepare. Or you may provide audio input / output parts, such as a handset for inputting / outputting an audio | voice, and a microphone, a speaker.

  The configuration of the telephone relay system 100 has been described above.

  Next, an example of the operation of the telephone relay system 100 will be described with reference to FIG. FIG. 4 is a sequence diagram illustrating an example of message relay processing by the telephone relay system 100. This example shows an example when making a call to the communication terminals 160 to 180. Here, the address of the communication terminal 160 is “0X-XXXX-XXXX”, the address of the communication terminal 180 is “0Y-YYYY-YYYY”, and is used when the communication terminal 160 and the communication terminal 180 perform communication. It is assumed that the relay address to be transmitted is “0A-AAAA-AAAA”.

  First, the communication terminal 160 sends an INVITE message for calling the communication terminal 180 to the network 200 (step S202). FIG. 5 is a diagram showing a part of the message 300 transmitted by the communication terminal 160 here. The SIP proxy server 140 determines whether or not the transmission destination address “0AAAAAAAAA” of the received INVITE message 300 is a relay address registered by the message relay device 120. The message 300 is transmitted to 120 (step S204).

  The relay information acquisition unit 126 of the message relay device 120 extracts the destination address information “0AAAAAAAAA” included in the INVITE message 300 received from the SIP proxy server 140, and obtains information on the communication terminal using “0AAAAAAAAA” as the relay address. Obtained from the relay information database 128 (step S206).

  Next, the relay determination unit 130 of the message relay device 120 extracts the source address information (From / P-Preferred-Identitiy etc.) from the INIVITE message 300, and determines whether or not to relay depending on whether or not the source address is registered. Judgment is made (step S208). In the example of the INVITE message 300 shown in FIG. 4, since the transmission source address is “0XXXXXXXXX”, the relay determination unit 130 determines whether “0XXXXXXXXX” is registered as the address of the communication terminal having “0AAAAAAAAA” as the relay address. To check that relaying is possible.

  Here, the relay determining unit 130 determines whether or not to relay based on whether or not the message source address is registered. However, the relay determining unit 130 may determine whether or not to relay based on other conditions. For example, when the relay information includes a message transfer period as in the relay address “0B-BBBB-BBBB” illustrated in FIG. 3, the relay determination unit 130 determines whether the message can be relayed based on the transfer period. You may make it do.

  Next, the message rewriting unit 132 of the message relay device 120 rewrites the transmission source address and the transmission destination address of the INVITE message 300 (step S210). Specifically, the message rewriting unit 132 rewrites the transmission destination address “0AAAAAAAAA” of the message 300 to “0YYYYYYYYY”, and rewrites the transmission source address “0XXXXXXXXX” to “0AAAAAAAAA”. FIG. 6 is a diagram showing a part of the INVITE message 302 rewritten by the message rewriting unit 132. As a result, the message 302 is transmitted to the communication terminal 180 with the telephone number “0A-AAAA-AAAA” as the source.

  Next, the message relay device 120 transmits the message 302 to the SIP proxy server 140 by the transmission unit 124 (step S212). First, the SIP proxy server 140 transmits a message (100 Trying) notifying that the processing is being performed to the communication terminal 160 of the transmission source (step S214), and then transmits the INVITE message 302 to the communication terminal 180 (step S214). Step S216).

  Upon receiving the INVITE message 302 from the SIP proxy server 140, the communication terminal 180 notifies the SIP proxy server 140 that processing is in progress (step S218). Next, the communication terminal 180 transmits a message (180 Ringing) notifying that the call is being made to the communication terminal 160 (step S220). Here, the transmitted message uses the address “0Y-YYYY-YYYY” of the communication terminal 180 as the transmission source, and the relay address “0A-AAAA-AAAA” is specified as the transmission destination.

  The message transmitted from the communication terminal 180 in step S220 has its source address and destination address rewritten through the same processing as that performed between the SIP proxy server 140 and the message relay device 120 in steps S204 to S212. And transmitted to the communication terminal 160.

  Thereafter, the message relay device 120 rewrites and forwards the source / destination addresses of all SIP messages generated until the call is connected and the call is started and the call is disconnected.

  In this way, by making a call using a relay address set between communication terminals registered in advance, the caller can make a call without knowing the real telephone number of the other party. In addition, the incoming side can identify that the call is from a registered party by setting a relay address in the caller number of the incoming call, and can distinguish it from a nuisance call or the like. . Therefore, both the calling side and the receiving side can smoothly communicate by telephone without notifying the other party of their real telephone numbers.

  Next, another example of the operation of the telephone relay system 100 will be described with reference to FIG. FIG. 7 is a sequence diagram illustrating another example of message relay processing by the telephone relay system 100. In the example of FIG. 7, a communication terminal (phone number “0Z-ZZZZ-ZZZZ”) other than the communication terminals 160 and 180 makes a call using the relay address “0A-AAAA-AAAA”. An example is shown. Hereinafter, a communication terminal that makes a call using the relay address “0A-AAAA-AAAA” will be described as a communication terminal Z.

  First, the communication terminal Z transmits an INVITE message to the SIP proxy server 140 (step S230). FIG. 8 is a diagram showing a part of the message 304 transmitted by the communication terminal Z in step S230. Referring to FIG. 8, the source address of the message 304 is the address “0ZZZZZZZZZ” of the communication terminal Z, and the destination address is “0AAAAAAAAA”.

  The SIP proxy server 140 determines whether or not the transmission destination address “0AAAAAAAAA” of the received INVITE message 304 is a relay address registered by the message relay device 120, and transmits the message 304 to the message relay device 120 (step). S232).

  Next, the relay information acquisition unit 126 of the message relay device 120 extracts the transmission destination address “0AAAAAAAAA” included in the INVITE message 304 received from the SIP proxy server 140, and uses the communication terminal information with “0AAAAAAAAA” as a relay address. Obtained from the relay information database 128 (step S234).

  Next, the relay determination unit 130 of the message relay device 120 extracts the source address information “0ZZZZZZZZZ” from the INIVITE message 304, and determines whether or not to relay depending on whether or not the source address is registered (step S208). In this case, since “0ZZZZZZZZZ” is not the address of a communication terminal that performs communication using the relay address “0AAAAAAAAA”, the relay determination unit 130 determines that relaying is not possible.

  The message relay device 120 transmits a message (404 Not Found) indicating that the transfer destination is not found to the transmission source communication terminal Z via the SIP proxy server 140 (steps S238 and S240). The communication terminal Z that has received the message transmits a reception confirmation message (ACK) to the SIP proxy server 140 and ends.

  As described above, even if a communication terminal that is not registered makes a call using a relay address set for a call between other terminals, the message relay apparatus rejects the transfer. Therefore, since communication can be performed using a relay address set only between communication terminals registered in advance, it is possible to reject an incoming call from an unknown party.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

It is a block diagram which shows schematic structure of the telephone relay system concerning one Embodiment of this invention. It is a block diagram which shows schematic structure of the message relay apparatus concerning the embodiment. It is a figure which shows an example of the relay information stored in a relay information database. It is a sequence diagram which shows an example of the message relay process by a telephone relay system. It is a figure which shows an example of the message transmitted from the communication terminal. It is a figure which shows an example of the message rewritten by the message relay apparatus. It is a sequence diagram which shows the other example of the message relay process by a telephone relay system. It is a figure which shows the other example of the message transmitted from the communication terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Telephone relay system 120 Message relay apparatus 122 Reception part 124 Transmission part 126 Relay information acquisition part 128 Relay information database 130 Relay judgment part 132 Message rewriting part 140 SIP proxy server 160,180 Communication terminal

Claims (8)

A message relay device for relaying message exchange between a plurality of communication devices,
A message receiving unit for receiving a message transmitted from the communication device;
A relay information database that stores relay information that associates a relay address used for exchanging the message between the plurality of communication devices and an address of the plurality of communication devices that exchange messages using the relay address;
A relay information acquisition unit that acquires the relay information including the relay address that matches the transmission destination address of the received message from the relay information database;
A message rewriting unit that rewrites the transmission destination address and the transmission source address of the message based on the relay information acquired by the relay information acquisition unit;
A message transmission unit that transmits a message rewritten by the message rewriting unit to a transmission destination after rewriting the message;
A message relay device comprising:   The message rewriting unit rewrites the transmission destination address of the message to an address other than the communication device that is the transmission source of the message among the addresses of the plurality of communication devices included in the relay information. Item 4. The message relay device according to Item 1.   The message relay device according to claim 1, wherein the message rewriting unit rewrites the transmission source information of the message to the relay address. A relay determination unit for determining whether to relay the message received by the message reception unit;
The relay determination unit according to claim 1, wherein the relay determination unit determines not to relay the message when the relay information acquired by the relay information acquisition unit does not include a source address of the message. Message relay device. The relay information further includes relay period information representing a period in which the plurality of communication devices can exchange messages using the relay address,
The message relay device according to claim 4, wherein the relay determination unit determines not to relay the message when the relay period information does not correspond to the relay period information.   6. The message relay device according to claim 5, wherein the relay determination unit notifies the transmission source of the message that the message is not relayed when it is determined that the message is not relayed. A message relay system comprising: a communication device used by a user to send and receive messages; and a message relay device for relaying message exchange between the plurality of communication devices,
The message relay device
A message receiving unit for receiving a message transmitted from the communication device;
A relay information database that stores relay information that associates a relay address used for exchanging the message between the plurality of communication devices and an address of the plurality of communication devices that exchange messages using the relay address;
A relay information acquisition unit that acquires the relay information including the relay address that matches the transmission destination address of the received message from the relay information database;
A message rewriting unit that rewrites the transmission destination address and the transmission source address of the message based on the relay information acquired by the relay information acquisition unit;
A message transmission unit that transmits a message rewritten by the message rewriting unit to a transmission destination after rewriting the message;
A message relay system comprising: Computer
A message relay device for relaying message exchange between a plurality of communication devices,
A message receiving unit for receiving a message transmitted from the communication device;
A relay information database that stores relay information that associates a relay address used for exchanging the message between the plurality of communication devices and an address of the plurality of communication devices that exchange messages using the relay address;
A relay information acquisition unit that acquires the relay information including the relay address that matches the transmission destination address of the received message from the relay information database;
A message rewriting unit that rewrites the transmission destination address and the transmission source address of the message based on the relay information acquired by the relay information acquisition unit;
A message transmission unit that transmits a message rewritten by the message rewriting unit to a transmission destination after rewriting the message;
A program for causing a message relay apparatus to function.

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