WO2012000364A1

WO2012000364A1 - Method and system for implementing cross-segment signaling intercommunication in video conference system

Info

Publication number: WO2012000364A1
Application number: PCT/CN2011/074993
Authority: WO
Inventors: 李峰; 杨扬; 包明辉
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-29
Filing date: 2011-05-31
Publication date: 2012-01-05
Also published as: CN101867586B; CN101867586A

Abstract

A method and system for implementing cross-segment signaling intercommunication in a video conference system are provided in the present invention, which is used to implement the registration, admission and status (RAS) signaling intercommunication between terminals in different network segments and the gatekeeper in the external network. The method includes: a terminal registers to an RAS agent, after receiving an RAS signaling message sent from the terminal, the RAS agent establishes a mapping relationship between the sequence number in the RAS signaling message and the source IP address and port of the terminal, and forwards the RAS signaling message to the gatekeeper; after receiving an RAS response message returned from the gatekeeper, the RAS agent sends, according to the established mapping relationship, the RAS response message to the corresponding terminal.

Description

Method and system for realizing inter-network segment signaling intercommunication of conference television system

Technical field

The present invention relates to the field of conference television technology, and in particular, to a method and system for implementing inter-network segment signaling interworking of a conference television system. Background technique

The conference television system refers to a communication technology that uses television and special equipment to connect conference rooms in two or more places through communication and computer networks, and to hold real-time, two-way and interactive visual conferences by television. The conference television system can connect multiple independent subnets and allow terminals in these subnets to join the same conference. Since each subnet belongs to a different network, the subnets cannot communicate with each other. Therefore, how to ensure each subnet can be ensured. The interworking between the terminal in the terminal and the gatekeeper on the Internet, such as registration, access authentication, and status inquiry (Registration, Admission & Status, RAS), becomes a problem to be solved. Summary of the invention

The technical problem to be solved by the present invention is to provide a method and system for implementing inter-network segment signaling intercommunication of a conference television system, which is used to implement interworking of RAS signaling between a terminal and a gatekeeper in different network segments.

To solve the above technical problem, the present invention provides a method for implementing inter-network segment signaling interworking of a conference television system, the method comprising:

The terminal registers with the registration, access authentication, and status query (RAS) proxy. After receiving the RAS signaling message initiated by the terminal, the RAS proxy establishes a mapping between the serial number in the RAS signaling message and the source IP address and port of the terminal. Relationship, and forward the RAS signaling message to the gatekeeper;

After receiving the RAS response message of the gatekeeper reply, the RAS proxy sends the RAS response message to the corresponding terminal according to the established mapping relationship.

Preferably, the RAS signaling message initiated by the terminal includes: a registration request, a call request, a cancellation registration request, a deletion terminal request or a state keep-alive request.

Preferably, when the RAS signaling message initiated by the terminal is a registration request message, the method package Includes:

When receiving the registration request message of the terminal, the RAS proxy replaces the first serial number in the registration request message with the second serial number, and then forwards the registration request message to the gatekeeper; and the first serial number is The second sequence number and the mapping relationship between the source IP address and the port of the terminal are recorded in the forwarding mapping table;

When receiving the registration confirmation or registration rejection message of the gatekeeper reply, the RAS agent searches for the forwarding mapping table according to the second serial number in the registration confirmation or registration rejection message, and restores the second serial number to After the first serial number, the registration confirmation or registration rejection message is forwarded to the corresponding terminal according to the IP address and port corresponding to the found second serial number.

Preferably, the method further includes:

When the RAS proxy receives the registration confirmation or registration rejection message, the terminal list is created or updated according to the port identifier, source IP address, and port of the terminal in the registration confirmation or registration rejection message, and the terminal list is used for saving. Corresponding relationship between the port identifier, the source IP address, and the port of the terminal; when receiving the RAS signaling message initiated by the gatekeeper, the RAS proxy searches the terminal list according to the terminal identifier in the RAS signaling message, and according to the found The IP address and port corresponding to the terminal identifier forward the RAS signaling message to the corresponding terminal.

Preferably, the method further includes:

After receiving the registration request message sent by the terminal, the RAS agent deletes the terminal of the terminal in the terminal list if the registration request message or the state keep-alive request message of the terminal is not received within a predetermined length of time. Identification, source IP address and port.

Preferably, the RAS signaling message initiated by the gatekeeper includes: a deletion request, a status request; and the gatekeeper carries the terminal identifier in the initiated status request message when the status request message is initiated.

The invention also provides a system for realizing inter-network segment signaling intercommunication of a conference television system, the system comprising: a gatekeeper and a RAS agent,

The RAS proxy is configured to: after receiving the RAS signaling message initiated by the terminal, establish a mapping relationship between the sequence number in the RAS signaling message and the source IP address and port of the terminal, and forward the RAS signaling message to Gatekeeper; and, after receiving the RAS response message from the gatekeeper, according to the establishment The mapping relationship sends the RAS response message to a corresponding terminal;

The gatekeeper is configured to: after receiving the RAS signaling message sent by the RAS proxy, replying to the RAS response message.

Preferably, the terminal initiated RAS signaling message includes a registration request message;

The RAS proxy is configured to: when receiving the registration request message of the terminal, after replacing the first serial number in the registration request message with the second serial number, forwarding the registration request message to the gatekeeper; The mapping relationship between the first serial number, the second serial number, and the source IP address and the port of the terminal is recorded in the forwarding mapping table; and when the registration confirmation or registration rejection message of the gatekeeper reply is received, according to the registration confirmation Or searching for the forwarding mapping table by using the second serial number in the registration rejection message, and after the second serial number is restored to the first serial number, the registration confirmation or registration rejection message is based on the found second The IP address and port corresponding to the serial number are forwarded to the corresponding terminal.

Preferably, the RAS proxy is further configured to: when receiving the registration confirmation or registration rejection message, create or update a terminal list according to a terminal identifier, a source IP address, and a port of the terminal in the registration confirmation message, where the terminal The list stores the terminal identifier of the terminal, the source IP address, and the corresponding relationship of the port. When receiving the RAS signaling message initiated by the gatekeeper, the terminal searches the terminal list according to the terminal identifier in the RAS signaling message, and correspondingly searches according to the found terminal identifier. IP address and port forward the RAS signaling message to the corresponding terminal;

The RAS signaling message initiated by the gatekeeper includes: a deletion request, a status request, and the gatekeeper is further configured to: carry the terminal identifier in the message that initiates the status request.

Preferably, the RAS proxy is further configured to: after receiving the registration request message sent by the terminal, if the registration request message or the state keep-alive request message of the terminal is not received within a predetermined length of time, deleting the The terminal ID, source IP address, and port of the terminal in the terminal list.

With the technical solution of the present invention, multiple terminals distributed in different network segments (the network segments cannot be intercommunicated) can communicate with the gatekeeper in the external network for RAS signaling. The solution is relatively simple to implement, and since only one external network gatekeeper is needed, the registration requirements of terminals of multiple network segments can be simultaneously realized, thereby saving IP address resources. BRIEF abstract FIG. 1 is a schematic diagram of networking for implementing RAS signaling inter-network segment interworking according to an embodiment of the present invention; FIG. 2 is a schematic diagram of RAS signaling interaction between modules according to an embodiment of the present invention;

3 is a schematic diagram of signaling forwarding implemented by a RAS proxy in a scenario in which an RRQ is sent by a terminal according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of signaling forwarding implemented by a RAS proxy in a scenario in which a gatekeeper sends a DRQ according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a scheme for inter-network segment signaling interworking of a conference television system, and the basic structure thereof is as follows:

In order to realize communication between several logical subnets with no IP layer, it is considered to introduce a RAS proxy to realize cross-network transmission of RAS signaling, and the terminal in different network segments can be smoothly implemented by the simple and easy proxy service method. Gatekeeper communication, and it is relatively simple to implement, there is no need to assign a special IP address to the terminal of each network segment.

After the introduction of the RAS proxy, the RAS signaling between the terminal and the gatekeeper passes through the transmission mechanism of the RAS proxy, which specifically involves the following two aspects:

1. How to correctly forward the RAS signaling sent from the terminal to the gatekeeper. In the case where there are multiple subnets, the terminals in different subnets respectively register the RAS proxy as the gatekeeper, and the RAS proxy receives the relevant information. Afterwards, forward it to the gatekeeper who is on the external network;

2. How to correctly forward the RAS signaling sent from the gatekeeper to the terminal. Since there are multiple terminals, it is necessary to determine which terminal the RAS signaling sent by the gatekeeper is forwarded to. However, since RAS signaling is not prepared for cross-network segments, there is no IP field that is forwarded to a specific terminal. Therefore, it is necessary to find a corresponding solution. There are two situations to consider when considering the solution: One is that the gatekeeper passively sends RAS signaling, for example, the terminal first sends a registration request (RRQ) message to the gatekeeper, and the gatekeeper replies to the terminal registration confirmation (Registration) Confirm, RCF) or the case of the registration reject (RRJ) message; the other is the RAS signaling initiated by the gatekeeper, such as the hang-up terminal registration that the gatekeeper actively sends to the terminal. Instructs the message terminal to delete the request (Disengage Request, DRQ). Considering that RAS signaling is based on the User Datagram Protocol (UDP) question and answer, that is, the terminal sends a request, and then the gatekeeper answers the request, for example, RRQ (Q) corresponds to RCF (A); The RAS signaling contains a sequence number (sqNum) field. Therefore, the sqNum can be used as an index to establish a correspondence between the RAS message and the identifier or IP address of the corresponding terminal, thereby completing the request <-> response flow between the terminal and the gatekeeper.

Based on the above basic concept, the present invention provides a method for implementing inter-network segment signaling interworking of a conference television system. After the terminal registers with the RAS proxy, the method includes:

When receiving the RAS signaling message initiated by the terminal, the RAS proxy establishes a mapping relationship between the sequence number in the RAS signaling message and the source IP address and port of the terminal, and forwards the RAS signaling message to the gatekeeper;

The RAS signaling message initiated by the terminal includes: a registration request (RRQ), a call request (ARQ), a deregistration request (URQ), a delete terminal request (DRQ), or a state keepalive request (IRR).

Further, when the RAS signaling is an RRQ message, the RAS proxy specifically implements the interworking processing of the RAS signaling across the network segment as follows:

When the RAS proxy receives the RRQ message of the terminal, it generates a new sqNum, and replaces the original sqNum (hereinafter also referred to as the first sqNum) in the RRQ message with the generated new sqNum (hereinafter also referred to as the second sqNum). After the RRQ message is forwarded to the gatekeeper; and the mapping relationship between the first sqNum, the second sqNum, and the source IP address and port of the terminal is recorded in the forwarding mapping table;

When receiving the RCF or RRJ message of the gatekeeper reply, the RAS proxy searches the forwarding map according to the second sqNum in the RCF or RRJ message, and restores the second sqNum in the RCF or RRJ message to the first sqNum. And forwarding the RCF or RRJ message to the corresponding terminal according to the found IP address and port corresponding to the second sqNum.

It should be noted that the content saved in the forwarding mapping table in the present invention includes the original sqNum, new sqNum, IP address and port.

Further, when receiving the RCF or RRJ message of the gatekeeper reply, the RAS agent determines whether the IP address and the terminal identifier of the terminal have been recorded, and if not, saves the IP address and the terminal identifier of the terminal in the terminal list;

When receiving the RAS signaling message (such as a DRQ message, an IRQ message, etc.) initiated by the gatekeeper, the RAS agent searches the terminal list according to the terminal identifier in the RAS signaling message, and according to the IP address and port corresponding to the found terminal identifier. And forwarding the RAS signaling message to the corresponding terminal.

The present invention will be further described in conjunction with the accompanying drawings and preferred embodiments.

FIG. 1 is a schematic diagram of networking for implementing a RAS signaling inter-network segment interworking system according to an embodiment of the present invention. The system includes a terminal and a gatekeeper. As shown in FIG. 1, the terminal protocol stack is in different network segments and cannot communicate with each other. In the embodiment, the RAS agent is introduced in the embodiment, and the main functions implemented by each network element are as follows:

The terminal protocol stack mainly implements signaling interaction with the gatekeeper and the multipoint control module (MCU); the gatekeeper is mainly responsible for handling terminal registration, call, bandwidth management, etc.;

The RAS proxy is mainly used to implement the interworking processing of the RAS signaling across the network segment, including: sending the terminal protocol stack in the network segment B to the proxy RAS message, and forwarding the network protocol to the gatekeeper through another network segment A; The RAS message of the gatekeeper in segment A is forwarded to the terminal through network segment B.

The registration of the conference terminal (also referred to as the terminal) to the RAS proxy can be implemented as follows:

The RAS proxy can span multiple network segments. In the case of multiple network segments, each network segment has a corresponding IP address. The RAS proxy can listen for packets on the IP addresses of multiple network segments. The terminal is registered to the IP address of the network segment corresponding to the RAS proxy.

In addition, the RAS agent has the RAS codec function and can resolve RAS signaling. For RAS signaling, only need to update sqNum, or extract some related information (such as IP address, port information, etc.) to save, other content without modification, directly forward all the content.

Further, the RAS agent is also used to:

After receiving the RCF or RRJ message from the gatekeeper, the network segment A determines whether the RCF message has been recorded. If the terminal identifier, the source IP address, and the port of the terminal are not recorded, create a terminal list, and save the terminal identifier, source IP address, and port in the RCF message in the newly created terminal list. Update the list of recorded terminals.

Similarly, when the RAS agent receives other messages from network segment B, it should also determine the source IP and port. If there is already a corresponding record, it will forward it to the gatekeeper; if there is no record, it indicates that the terminal has not been registered, then discard it. .

Therefore, the RAS proxy may, after receiving the RAS signaling message initiated by the gatekeeper, search for the saved terminal list according to the terminal identifier carried in the RAS signaling message, and forward the RAS signaling message to the corresponding terminal.

In addition, the RAS proxy can establish a timeout mechanism. If the RRQ (including the keep-alive RRQ or the full RRQ) or the IRR message is not received within a predetermined length of time (such as 10 minutes) after receiving the RRQ message of the terminal, delete the corresponding Source IP address, port, and terminal ID in the terminal list.

As shown in Figure 2, RAS signaling is ^ UDP question and answer. The RAS signaling interaction process between modules is shown in Figure 2.

The RAS signaling initiated by the terminal includes: a registration request message, an ARQ (call request message), a URQ (unregistration request message), a DRQ (delete request message), or an RR (state keep-alive message).

The RAS signaling initiated by the gatekeeper includes: DRQ (Delete Request Message), IRQ (Terminal State Request Message), and the like.

The DRQ message can be initiated by the terminal or by the GK.

Figure 3 shows the process of transmitting the RRQ by the terminal as an example. The RAS proxy implements the signaling forwarding process. For other RAS signaling initiated by other terminals, such as ARQ and DRQ, the forwarding policy is also applicable. As shown in Figure 3, the process is described as follows:

After the RAS agent receives the RRQ message sent by the terminal, because there is only one gatekeeper, the RAS signaling can be directly forwarded to the gatekeeper, and a forwarding mapping table is established according to the sqNum sequence number in the RAS signaling before the transmission. The table stores the IP address, identity, port and other related information of the relevant terminal. After receiving the RCF message of the gatekeeper reply, the RAS proxy parses the sequence number in the message and finds the IP address of the corresponding terminal according to the index, and sends the IP address to the corresponding terminal. . In addition, referring to FIG. 3, when the RAS proxy receives the RCF or RRJ message of the gatekeeper reply, the terminal list is also created or updated according to the IP address and the terminal identifier of the terminal in the RCF message, where the terminal list is used for saving. Correspondence between the IP address, port, and terminal ID of the terminal.

Figure 4 shows the process of sending a DRQ by a gatekeeper as an example. The RAS proxy implements the signaling forwarding process. For other RAS signaling initiated by other gatekeepers, such as IRQ, the forwarding policy is also applicable. As shown in Figure 4, the process is described as follows:

For the RAS signaling request initiated by the gatekeeper, the terminal list established by the previous RAS proxy is used. The terminal list is mainly indexed by the terminal identifier (endPointID), and the IP address and port information of the terminal are mainly saved, so that the RAS proxy The corresponding terminal address can be found through the terminal list. That is, when the RAS proxy receives the RAS signaling message initiated by the gatekeeper, it searches the terminal list according to the terminal identifier in the RAS signaling message, and then the RAS signaling according to the IP address and port corresponding to the found terminal identifier. The message is forwarded to the corresponding terminal.

However, there is a special case. There is no endPointID field in the IRQ (Conference Keep Alive Request) message. This needs to modify the gatekeeper's processing. When the IRQ is sent, the terminal ID field is added.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

INDUSTRIAL APPLICABILITY With the technical solution of the present invention, it is possible to realize communication between a plurality of terminals distributed in different network segments (the network segments cannot be interconnected) and a gatekeeper at the external network to perform RAS signaling. The solution is simpler to implement, and since only one external network gatekeeper is needed, the registration requirements of the terminals of multiple network segments can be realized at the same time, thereby saving IP address resources.

Claims

Claim

A method for implementing inter-network segment signaling interworking of a conference television system, the method comprising: the terminal registering with a registration, access authentication, and status query (RAS) proxy, after the RAS proxy receives the RAS signaling message initiated by the terminal, Establishing a mapping relationship between the sequence number in the RAS signaling message and the source IP address and port of the terminal, and forwarding the RAS signaling message to the gatekeeper;

2. The method of claim 1 wherein

The RAS signaling message initiated by the terminal includes: a registration request, a call request, a deregistration request, a deletion terminal request or a state keep-alive request.

The method of claim 2, wherein, when the RAS signaling message initiated by the terminal is a registration request message, the method includes:

4. The method of claim 3, wherein the method further comprises:

5. The method of claim 4, wherein the method further comprises:

6. The method of claim 4, wherein

The RAS signaling message initiated by the gatekeeper includes: a deletion request, a status request;

And the gatekeeper carries the terminal identifier in the initiated status request message when the status request message is initiated.

7. A system for implementing inter-network segment signaling intercommunication of a conference television system, the system comprising: a gatekeeper and a RAS agent,

The RAS proxy is configured to: after receiving the RAS signaling message initiated by the terminal, establish a mapping relationship between the sequence number in the RAS signaling message and the source IP address and port of the terminal, and forward the RAS signaling message to After receiving the RAS response message of the gatekeeper reply, the RAS response message is sent to the corresponding terminal according to the established mapping relationship;

The gatekeeper is configured to: reply after receiving the RAS signaling message sent by the RAS proxy

RAS response message.

8. The system of claim 7, wherein

The RAS signaling message initiated by the terminal includes a registration request message;

9. The system of claim 8 wherein

The RAS proxy is further configured to: when receiving the registration confirmation or registration rejection message, create or update a terminal column according to the terminal identifier, source IP address, and port of the terminal in the registration confirmation message The terminal list stores the terminal identifier, the source IP address, and the port correspondence relationship of the terminal; when receiving the RAS signaling message initiated by the gatekeeper, searching for the terminal list according to the terminal identifier in the RAS signaling message, and searching according to the terminal Forwarding the RAS signaling message to the corresponding terminal by the IP address and the port corresponding to the terminal identifier;

10. The system of claim 8 or 9, wherein

The RAS proxy is further configured to: after receiving the registration request message sent by the terminal, if the registration request message or the state keep-alive request message of the terminal is not received within a predetermined length of time, deleting the terminal list The terminal identifier, source IP address, and port of the terminal.