WO2008141569A1 - Method, device and network system for transmitting messages - Google Patents

Abstract

A method for transmitting messages includes following steps: processing the messages based on pre-set address setting attribute to generate messages needed to be transmitted, whose source address is the relevant address of the received messages; sending the messages to be sent, the relevant address of the received messages is the source address or the mapping address of the source address of the received messages. The corresponding media gateway controller, media gateway and network system are also provided. It can make the source address of transmitting messages be the relevant address of the received messages, and can make the device receiving the messages identify the information source, it also can simplify network topology and optimize the performance of the media gateway.

Description

 Method, device and network system for forwarding messages This application claims to be submitted to the Chinese Patent Office on May 18, 2007, with the application number of 200710108512.X, and the invention name is "for forwarding 4 艮 text method and media gateway controller and media gateway The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. Technical field

 The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a network system for forwarding a message. Background technique

 Media gateway controllers and media gateways are two key components in a packet network. The media gateway controller is responsible for the call control function, and the media gateway is responsible for the service bearer function, which realizes the separation of the call control plane and the service bearer plane, thereby fully sharing network resources and simplifying equipment upgrade and service expansion. Media Gateway Control Protocol developed by the International Telecommunication Union H.248 is the main protocol for communication between media gateways and media gateway controllers. The connection model defined by H.248 includes a termination and a context. Various resources on the media gateway are abstractly represented as terminals, and the terminal is further divided into a physical terminal and an temporary (Ephemeral) terminal. The former represents some A semi-permanent physical entity, such as a time division multiplexed channel, etc., which represents some temporary applications, public resources released after use, such as real-time transport protocol flows. The combination between terminals is abstracted as a context ( Context ).

Please refer to FIG. 1 , which is a topology diagram of forwarding multicast packets in the prior art. The multicast message here refers to Internet Protocol (IP) multicast; the media gateway includes the terminal 101 and the terminal 102, and the terminal 101 and the terminal 102 belong to the context Context 1 (the context ID number is 1); The device 111, the user equipment 112, the terminal device 113, and the terminal 101 of the media gateway belong to the IP domain I, and the multicast source A, the multicast source B, and the terminal 102 of the media gateway belong to the IP domain II. In the prior art, the process of processing a multicast packet by the media gateway is as follows: The media gateway establishes a context Context 1 according to the control information sent by the media gateway controller, and establishes a terminal 101 and a terminal 102 belonging to the context Context 1; and the terminal 102 of the media gateway After receiving the multicast packet sent by the multicast source 1, the multicast packet is delivered to the terminal 101 of the same context 1; the terminal 101 of the media gateway sends the multicast message to the IP domain I. The source address of the multicast message sent by the terminal 101 is the IP address of the terminal 101 itself.

 In the actual operation, the inventor has found that at least the following problems exist in the prior art: In the prior art, the terminal of the media gateway sends an IP packet with its own IP address as the source address, and when the information source (multicast source) has multiple If the information source is forwarded through the same terminal of the media gateway, the multicast message is not recognized when receiving the multicast message; if the information source is forwarded through multiple terminals of the media gateway It may increase the difficulty of the media gateway managing the IP address of the terminal, which complicates the network topology. Summary of the invention

 The embodiment of the invention provides a method, a device and a network system for forwarding a message, so that the source address of the forwarded message is the relevant address of the received message, so that the information source can be identified.

 The embodiment of the invention provides a method for forwarding a message, including:

 After receiving the packet to be forwarded, the received packet is processed according to the preset address setting attribute, and the packet to be sent is generated;

 And setting a source address of the to-be-sent packet to a related address of the received packet; and sending the to-be-sent packet;

 The relevant address of the received message is a source address of the received message or a mapped address of a source address of the received message.

 A media gateway controller provided by an embodiment of the present invention includes:

 a source address control information generating unit, configured to generate control information indicating a set source address, and a source address control information sending unit, configured to send, to the media gateway, control information of the set source address generated by the source address control information generating unit;

 The control information is information indicating that the media gateway sets the relevant address of the received message to the source address of the message to be sent;

 The relevant address of the received message is the source address of the received message or the mapped address of the source address of the received message.

 A media gateway provided by an embodiment of the present invention includes:

a source address control information receiving unit, configured to receive control information of a set source address sent by the media gateway controller, and set an address setting attribute according to the control information of the set source address; a message receiving unit, configured to receive a message to be forwarded;

 a message processing unit, configured to process, according to a preset address setting attribute, a message received by the message receiving unit, to generate a message to be sent, where a source address of the to-be-sent message is the message receiving The relevant address of the message received by the unit;

 And a message sending unit, configured to send a to-be-sent message generated by the message processing unit, where the related address of the received message is a source address of the received message or a mapped address of the source address of the received message.

 The embodiment of the invention further provides a network system, including:

 a media gateway controller, configured to generate control information indicating a set source address, and send the control information to the media gateway;

 a media gateway, configured to receive control information sent by the media gateway controller, set an address setting attribute according to the control information, process the received message according to the address setting attribute, to generate a packet to be sent, where the to-be-sent The source address of the packet is the relevant address of the received packet, and the generated to-be-sent packet is sent;

 The relevant address of the received message is a source address of the received message or a mapped address of the source address of the received message.

 In the technical solution provided by the embodiment of the present invention, the received packet is processed according to the preset address setting attribute to generate a packet to be sent, and the source address of the to-be-sent packet is the relevant address of the received packet, such as The source address of the received packet or the mapped address of the source address of the received packet. The source address of the media gateway terminal is not the address of the terminal itself, but the related address of the received message, and the packet sent by the media gateway terminal is related to the source address of the information source, so that the media gateway terminal address can be solved. The problem that the terminal device that receives the packet cannot identify the information source can prevent the media gateway from creating different terminals for different information sources, resulting in a complicated structure. According to the present invention, the network topology can be simplified and the performance of the media gateway can be optimized. DRAWINGS

 FIG. 1 is a topological diagram of forwarding a multicast packet in the prior art;

 2 is a flowchart of a method for forwarding a message according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a network system according to an embodiment of the present invention. detailed description In order to make the principles, features and advantages of the present invention more apparent, the following description will be described in conjunction with the specific embodiments.

 Embodiment 1

 As shown in FIG. 2, the method for forwarding a packet in the embodiment of the present invention includes the following steps: Step 201: A media gateway receives a packet.

 Step 202: The attribute processing message is set according to the preset address setting attribute to generate a message to be sent, and the source address of the to-be-sent message is the relevant address of the received message.

 Step 203. Send a message to be sent.

 The relevant address of the received packet is the source address of the received packet and the mapped address of the source address of the received packet. It can be seen that the source address of the packet sent by the media gateway can be the source address of the received message or the mapped address of the source address of the received message.

 The media gateway is a gateway between the media, and is used to forward the media data according to the control information sent by the media gateway controller. The IP packet is a piece of media data. The terminal of the media gateway/media gateway receives the IP packet. After processing, the terminal of the media gateway/media gateway sends the processed IP packet.

 Embodiment 2

 In this embodiment, the source address of the IP packet sent by the media gateway is the source address of the received IP packet.

 Before the media gateway forwards the packet, the media gateway receives the control information sent by the media gateway controller, establishes a context by using the control information, and creates (Creat) the first terminal and the second terminal, so that the first terminal and the second terminal belong to The same context.

 The terminal and context are concepts defined by H.248, where context is the connection between terminals, which describes the topology relationship between terminals and the parameters of media mixing/exchange. A context consists of a set of terminals, and a context can contain multiple terminals. Depending on the service characteristics of the media gateway, the maximum number of terminals that can be included in the context is different. One terminal belongs to a context. The media gateway can establish a root terminal, and the root terminal represents the entire media gateway.

 The characteristics of the terminal are represented by attributes, events, signals, and statistics. In order to solve the problem of shielding terminal diversity, the concept of a package is introduced in H.248, and various characteristic parameters of the terminal are combined into a packet.

In order to achieve the object of the present invention, this embodiment extends a package named "IP Routing Packet 1" (IP route Package 1) ", the extension packet is used by the media gateway controller to instruct the media gateway terminal to set the source address of the IP packet, so that the source address of the IP packet sent by the terminal is received. Source address. The contents of the extension package are as follows:

 Package name: IP routing package 1 (IP route Package 1)

 Package ID: iproutel, ( Oxxxxx )

 version 1

 Define an address setting attribute: Named "sak ( source address keep ),,, the value is an enumerated type, the value is " οη,, (0χ0001) or "off, (0x0002), the default value is "off."

 The media gateway controller instructs the media gateway to set the iproutel/sak attribute on the second terminal. When the iproutel/sak attribute is set to "on" (open), when the first terminal receives the IP packet, the first terminal transmits the packet to the second terminal that belongs to the same context; the second terminal is first according to the above attribute. The source address of the IP packet received by the terminal is set to the source address of the IP packet to be sent. If the value is "off", the media gateway does not process the attribute. When the terminal sends an IP packet, the source address is the IP address of the second terminal itself. The attribute can be defined in the descriptor terminationstate or descriptor. On localcontrol, you can also define settings on other descriptors.

 It should be noted that the information such as the extended package name, the package ID, and the attribute name is only a mark, and the equivalent replacement of the information belongs to the protection scope of the present invention; the manner of setting the attribute may also be replaced by an event or a signal parameter. .

 The following describes another extension package, which is to add another address setting attribute based on the above expansion package, specifically: Add another attribute of "ipkin" "sakin", the value is an enumerated type, and the value is "on" "(0x0001) or "off" (0x0002), the default value is "off".

 The media gateway controller instructs the media gateway to set the iproutel/sakin attribute on the first terminal. When the iprouter/sakin attribute is set to "on", the first terminal receives the IP packet, and the first terminal sets the source address of the IP packet received by the first terminal as the source of the IP packet to be sent according to the foregoing attribute. address. When the value is "off", the media gateway does not process the attribute. When the terminal sends the IP address, the source address is the local IP address of the second terminal itself.

The above describes two types of extension packages. The media gateway controller instructs the media gateway to set the address setting attribute of the extension package to the first terminal or the second terminal through the extension package, so that the source address of the IP packet to be sent is received. Source address of the IP packet. Understandably, the media gateway controller The media gateway may also be configured to set the extended packet attribute to the context to set the source address of the IP packet to be sent to the source address of the received IP packet. In addition, the media gateway controller may further instruct the media gateway to add the extended packet. The attribute is set to any combination of the three objects of the first terminal, the second terminal, and the context.

 The media gateway receives the control information of the source address sent by the media gateway controller, and sets the iproutel/sak attribute on the second terminal. The process of forwarding the packet by the media gateway is as follows:

 When receiving the IP packet, the first terminal of the media gateway transmits the packet to the second terminal, and the second terminal processes the packet according to the preset address setting attribute to generate the IP packet to be sent, where to be sent. The source address of the IP packet is the source address of the received IP packet. For example, the first terminal of the media gateway and the second terminal are in the same context. The media gateway sets the iproutel/sak attribute to "on" to the second terminal. The first terminal receives the IP packet whose source address is 192.168.1.100. When the media gateway forwards the IP packet through the second terminal, the first terminal does not modify the IP packet when the first terminal receives the IP packet. The source address, that is, the source address is still "192.168.1.100" when the second terminal forwards the IP packet. The media gateway may be transcoded before forwarding the IP packet. The source address of the IP packet sent by the media gateway. For the source address of the received IP packet, the receiving terminal device can identify the actual information source by using the source address of the IP packet, and can set a source address list for allowing the IP packet to be received in advance to filter unnecessary addresses. IP packet.

 In a practical application, for example, a multi-party conference, there may be cases where an IP packet received by multiple terminals is sent out through a terminal that belongs to the same context, and/or an IP document received by one terminal passes through multiple contexts belonging to the same context. When the terminal sends the IP packet to the outside of the context, the terminal needs to keep the source address of the IP packet when it enters the context. The implementation principle is the same as that of this embodiment, and is not mentioned here. Further, the media gateway controller may instruct the media gateway to set which terminals of the context apply the method of the present invention by extending the attributes of the context, and set the source address to the source address when the IP packet enters the context when sending the IP packet to the context. .

It should be noted that the media gateway controller may instruct the media gateway to receive and send IP packets through the level of the terminal itself created; or may instruct the media gateway to receive and send IP packets through the root (ROOT) terminal level, Set the property of the source address to the root terminal. In the latter case, the media gateway sets the attribute of setting the source address to the root terminal; receives the IP report. In this case, the terminal sets the source address of the received IP packet as the source address of the IP packet to be sent according to the attribute.

 Embodiment 3

 In this embodiment, the source address of the IP packet sent by the media gateway is the mapping address of the source address of the received IP packet. Please refer to FIG. 3 , which is a flowchart of a method for forwarding a message according to Embodiment 2 of the present invention.

 Before the media gateway forwards the packet, the media gateway receives the control information sent by the media gateway controller. The information is used to establish a context, and the first terminal and the second terminal are created, so that the first terminal and the second terminal belong to the same context.

 In order to achieve the object of the present invention, this embodiment extends a packet named "IP route Package 2", which is used by the media gateway controller to instruct the media gateway terminal to send the IP address of the IP packet. The setting method is such that the source address of the IP packet sent by the terminal is the mapping address of the source address of the received IP packet. The contents of the extension package are as follows:

 Package name: IP route package 2

 Package ID: iproute2 , ( Oxxxxx )

 version 1

 Define an address setting attribute: Named "mp", the value is a list of strings, and each string represents an address mapping. The media gateway controller instructs the media gateway to set the attribute on the second terminal. After receiving the IP packet, the first terminal transmits the packet to the second terminal, and the second terminal determines to send the IP packet according to the address mapping relationship. The source address of the text. For example, the media gateway sets the string list of the iproute2/mp attribute to "10.11.0.1: 202.1.0.11, and "10.11.0.2: 202.1.0.12," to the second terminal, indicating that the IP address received by the first terminal is The source address of the text is "10.11.0.1", and its mapping address is "202.1.0.11". The second terminal sets "202.1.0.1 Γ, the source address of the IP packet to be sent according to the above attributes; if the first terminal receives The source address of the IP packet is "10.11.0.2", and the mapping address is "202.1.0.12". The second terminal sets "202.1.0.12" as the source address of the IP packet to be sent according to the above attributes; If the source of the received message is not included in the list of strings, it will not be processed. The above list of strings can be saved in the form of a mapping table on the media gateway. The attribute can be defined in the descriptor terminationstate or descriptor. On localcontrol, you can also define settings on other descriptors.

It should be noted that the information such as the extended package name, package ID, and attribute name is only a mark. Equivalent replacements of these information are within the scope of the invention; the manner in which the attributes are set can also be replaced by events or signal parameters.

 The following describes another extension package, which adds another address setting attribute to the above expansion package, specifically: Define an attribute: Named "mpin", the value is a list of strings, each string Represents an address mapping relationship. The media gateway controller instructs the media gateway to set the attribute on the first terminal. After receiving the IP packet, the first terminal determines the source address of the externally sent IP packet according to the address mapping relationship. For example, the media gateway sets the iproute2/mpin attribute to "10.11.0.2: 202.1.0.22, which is set in the first terminal, indicating that the source address of the IP packet received by the first terminal is "10.11.0.2", and its mapping address is "" 202.1.0.22", the first terminal sets "202.1.0.22" as the source address of the outgoing IP packet according to the above attributes.

 The above describes two types of extension packages. The media gateway controller instructs the media gateway to set the extended package attribute to the first terminal or the second terminal through the extension package, so that the source address of the IP packet to be sent is the received IP packet. The mapped address of the source address. It is to be understood that the media gateway controller may also instruct the media gateway to set the extended packet attribute to the context, so that the source address of the IP packet to be sent is the mapped address of the source address of the received IP packet; The gateway controller may also instruct the media gateway to set the extended package attribute to any combination of the first object, the second terminal, and the context.

 The media gateway receives the control information of the source address sent by the media gateway controller, and sets the iproute2/mp attribute on the second terminal. The process of forwarding the message by the media gateway is as follows:

The first terminal of the media gateway receives the IP packet and sends it to the second terminal. The second terminal sets the attribute processing packet according to the preset address setting, and generates the IP packet to be sent. The source address of the IP packet to be sent. The mapped address of the source address of the received IP packet. For example, the first terminal and the second terminal on the media gateway are in the same context. The media gateway sets the string list of iproute2/mp attributes " 10.11.0.1: 202.1.0.11" and " 10.11.0.2: 202.1.0.12" to the second terminal. After receiving the IP packet whose source address is "10.11.0.1", the IP address is transmitted to the second terminal, and the media gateway queries the second terminal to query the string list of the address setting attribute, according to the query result. The source address of the IP packet sent externally is set to "202丄0.11". The second terminal of the media gateway sends an IP packet to be sent. The source address of the IP packet sent by the media gateway is the mapped address of the source IP address of the received IP packet. You can set the source address list for receiving IP packets in advance to filter unnecessary IP packets.

 In an actual application, such as a multi-party conference, an IP packet received by multiple terminals may be sent out through a terminal that belongs to the same context, and/or an IP packet received by a terminal may be sent through multiple contexts in the same context. When the terminal sends the IP packet to the outside of the context, the terminal needs to keep the source address of the IP packet when it enters the context. The implementation principle is the same as that of this embodiment, and is not mentioned here.

 Further, the media gateway controller may instruct the media gateway to set which terminals of the context apply the method of the present invention by extending the attributes of the context, and when the IP packet is sent out of the context, the source address is set to be an IP address. The mapped address of the source address.

 It should be noted that the media gateway controller may instruct the media gateway to receive and send IP packets through the terminal level created by itself; or may instruct the media gateway to receive and send IP packets through the root terminal. In the latter case, the media gateway sets the attribute of the source address to the root terminal. When receiving the IP packet, the root terminal sets the mapping address of the source address of the received IP packet to be sent according to the attribute. IP · ^ The source address of the text.

 Embodiment 4

 Please refer to FIG. 3 , which is a schematic diagram of a network system in an embodiment of the present invention. The network system provided in this embodiment includes:

 a media gateway controller 420, configured to generate control information for setting a source address, and send control information for setting a source address;

 The media gateway 410 is configured to receive control information sent by the media gateway controller 420, set an address setting attribute according to the control information of the set source address, and receive the message, and process the received message according to the address setting attribute to generate The source address of the packet to be sent is the relevant address of the received packet, and the generated packet to be sent is sent.

 The media gateway controller 420 may include: a source address control information generating unit 421 and a source address control information transmitting unit 422.

The source address control information generating unit 421 is configured to generate control information for setting a source address. The source address control information sending unit 422 is configured to send, to the media gateway 410, control information of the set source address generated by the source address control information generating unit 421. The media gateway 410 may include: a source address control information receiving unit 414, a message receiving unit 411, a text sending unit 413, and a text processing unit 412.

 The source address control information receiving unit 414 is configured to receive control information of the set source address sent by the media gateway controller 420, and set an address setting attribute according to the control information of the set source address.

 The message receiving unit 411 is configured to receive the message.

 The message processing unit 412 may be configured on the message receiving unit 411 or the message sending unit 413, and configured to process the message received by the message receiving unit 411 according to the address setting attribute to generate a message to be sent. The source address of the sent message is the relevant address of the message received by the message receiving unit 411.

 The message sending unit 413 is configured to send the to-be-sent message generated by the message processing unit 412. The control information of the source address is specifically configured to instruct the media gateway 410 to set the relevant address of the received packet as the control information of the source address of the packet to be sent; the relevant address of the received packet is, and the received packet is received. The source address itself or the mapped address of the source address of the received message.

 The working principle of the system is as follows: The source address control information generating unit 421 of the media gateway controller 420 generates control information for setting the source address; the source address control information transmitting unit 422 transmits the settings generated by the source address control information generating unit 421 to the media gateway 410. Source address control information. The source address control information receiving unit 414 of the media gateway 410 receives the control information of the set source address sent by the media gateway controller 420, and sets the address setting attribute according to the control information of the set source address. The message receiving unit 411 receives the message. The message processing unit 412 processes the message received by the message receiving unit 411 according to the address setting attribute to generate a message to be sent, and the source address of the to-be-sent message is the relevant address of the message received by the message receiving unit 411. . The message transmitting unit 413 transmits the to-be-sent document generated by the text processing unit 412.

 It can be understood that the message processing unit 412 can be disposed on the message receiving unit 411 and/or the message transmitting unit 413.

It can be seen from the foregoing technical solution that, in the embodiment of the present invention, the media gateway receives the packet; the attribute processing packet is configured according to the preset address setting, to generate the packet to be sent, and the source address of the to-be-sent packet is received. The relevant address of the packet; the relevant address of the received packet is the source address of the received packet or the mapped address of the source address of the received packet. The source address of the packet sent by the media gateway terminal is not the address of the terminal itself, but the relevant address of the received packet, and the media network. The packet sent by the terminal is related to the source address of the information source, so that the problem that the media gateway terminal address may cause the terminal device that receives the packet to fail to identify the information source may be solved, and the media gateway may be prevented from creating different terminals for different information sources. In the case of a complicated structure, according to the technical solution provided by the present invention, the network topology structure can be simplified, and the performance of the media gateway can be optimized.

 It should be noted that, in the foregoing embodiment, the communication between the media gateway controller and the media gateway is based on H.248, and the packet processed by the media gateway is based on the IP protocol, and the invention is not excluded based on other protocols.

 Obviously, those skilled in the art should understand that each unit or step in the above embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed among multiple computing devices. Optionally, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or A plurality of units or steps of them are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The body gateway and the network system are described in detail, and the principles and implementation manners of the present invention are explained in the specific examples. The description of the above embodiments is only used to help understand the method and core idea of the present invention; The present invention is not limited by the scope of the present invention, and the details of the present invention are not limited by the scope of the present invention.

Claims

Rights request A method for forwarding a message, comprising:  After receiving the packet to be forwarded, the received packet is processed according to the preset address setting attribute, and the packet to be sent is generated;  And setting a source address of the to-be-sent packet to a related address of the received packet; and sending the to-be-sent packet;  The relevant address of the received message is a source address of the received message or a mapped address of a source address of the received message.  2. The method according to claim 1, further comprising:  Before processing the received message according to the preset address setting attribute, receiving control information for indicating the set source address, and setting the address setting attribute according to the control information.  3. A method according to claim 1 or 2, characterized in that  Before receiving the packet to be forwarded, receiving control information for controlling the generated terminal, and establishing a context, the first terminal, and the second terminal according to the control information of the generated terminal;  The receiving the packet to be forwarded is the first terminal receiving the packet; wherein the first terminal and the second terminal belong to the context.  The method according to claim 3, wherein the address setting attribute takes an enumerated type;  The process of processing the received message according to a preset address setting attribute includes one or any combination of the following:  When the address setting attribute is set in the first terminal, the first terminal sets the source address of the to-be-sent packet to the relevant address of the received packet according to the address setting attribute;  When the address setting attribute is set in the second terminal, the second terminal sets the source address of the to-be-sent packet to the relevant address of the received packet according to the address setting attribute;  When the address setting attribute is set in the context, the source address of the message to be sent is set to the relevant address of the received message according to the address setting attribute in the context. The method according to claim 3, wherein the address setting attribute is a string list, and the string list indicates a source address of the received message and a source of the received message. The mapping relationship of the mapped addresses of the addresses;  The process of processing the message according to a preset address setting attribute includes one or any combination of the following:  When the address setting attribute is set in the first terminal, after receiving the packet, the first terminal queries the string list, and sets the source address of the to-be-sent packet to receive according to the result of the query. To the relevant address of the message;  When the address setting attribute is set in the second terminal, after receiving the packet delivered by the first terminal, the second terminal queries the string list, and according to the result of the query, the packet to be sent is sent. The source address is set to the relevant address of the received message;  When the address setting attribute is set in the context, after receiving the message, querying the character string list, and setting the source address of the to-be-sent message to the relevant address of the received message according to the result of the query.  6. The method according to claim 5, wherein the list of character strings can be saved on the media gateway in the form of a mapping table.  7. The method according to claim 5 or 6, further comprising the step of controlling the address setting attribute:  When the address setting attribute is set to an open state, the address of the received message is processed according to the address setting attribute;  When the address setting attribute is set to the off state, the address of the received message is not processed.  8. Method according to claim 1 or 2, characterized in that  Before receiving the message, receiving control information for controlling the generated terminal, and establishing a root terminal according to the control information;  The received message is that the root terminal receives the message; and the sending the to-be-sent message body is that the root terminal sends the to-be-sent message.  The method according to claim 1, wherein after the sending the message to be sent, the method further includes: The receiving device receives the sent message, and identifies the actual information source by using the source address of the packet. 10. A media gateway controller, comprising:  a source address control information generating unit, configured to generate control information indicating a set source address, and a source address control information sending unit, configured to send, to the media gateway, control information of the set source address generated by the source address control information generating unit;  The control information is information indicating that the media gateway sets the relevant address of the received message to the source address of the message to be sent;  The relevant address of the received message is the source address of the received message or the mapped address of the source address of the received message.  11. A media gateway, comprising:  The source address control information receiving unit is configured to receive control information for setting a source address sent by the media gateway controller, and set an address setting attribute according to the control information of the set source address;  a message receiving unit, configured to receive a message to be forwarded;  a message processing unit, configured to process, according to a preset address setting attribute, a message received by the message receiving unit, to generate a message to be sent, where a source address of the to-be-sent message is the message receiving The relevant address of the message received by the unit;  And a message sending unit, configured to send a to-be-sent message generated by the message processing unit, where the related address of the received message is a source address of the received message or a mapped address of the source address of the received message.  The media gateway according to claim 11, wherein the message processing unit is set on a message receiving unit and/or a message sending unit.  13. A network system, comprising:  a media gateway controller, configured to generate control information indicating a set source address, and send the control information to the media gateway;  a media gateway, configured to receive control information sent by the media gateway controller, set an address setting attribute according to the control information, process the received message according to the address setting attribute, to generate a packet to be sent, where the to-be-sent The source address of the packet is the relevant address of the received packet, and the generated to-be-sent packet is sent;  The relevant address of the received message is a source address of the received message or a mapped address of the source address of the received message.