WO2008009152A1

WO2008009152A1 - A proxy server framework and a method basing on session initiation protocol

Info

Publication number: WO2008009152A1
Application number: PCT/CN2006/001377
Authority: WO
Inventors: Mingdong Li; Rongjun Zhu; Weiliang Lian
Original assignee: Zte Corporation
Priority date: 2006-06-19
Filing date: 2006-06-19
Publication date: 2008-01-24

Abstract

A proxy server framework and a method are based on Session Initiation Protocol. The proxy server includes: a network transmitting module, one or more protocol process modules, and further includes one or more protocol location register modules. By processing both a user end device and a bureau end device separately which interact with the proxy server, the invention supports wandering function of the Session Initiation Protocol user end device in the case of that the proxy server doesn't change data configuration. Thereby the complexity of data configuration is reduced, data maintenance is convenience, and the system working efficiencyis improved.

Description

Architecture of proxy server based on session initiation protocol and implementation method thereof

The present invention relates to a session initiation protocol technology, and more particularly to an architecture for implementing a session initiation protocol based proxy server and an implementation method thereof. Background technique

The Session Initiation Protocol (SIP) is the RFC3261 protocol of The Internet Engineering Task Force (IETF). A proxy server (Proxy Server) is a type of control device defined by the Session Initiation Protocol.

As shown in Figure 1, the system is a network diagram for the session initiation protocol. The following network elements are included in the session initiation protocol network: a user agent, a proxy server, a redirect server, and a registration server. These network elements communicate mainly through a session initiation protocol.

A user agent is a terminal system that performs actions on behalf of a user. It typically consists of two parts: User Agent Clients (UAC) 101 and User Agent Server (UAS) 102. The user agent client is used to initiate a call request and the user agent server is used to respond to a call request.

The proxy server (Proxy Server) 103 is a client proxy that performs the function of transferring and forwarding SIP messages. The message mechanism is similar to UAC101 and UAS102. After the received request message is translated and processed, it is passed to other servers. Essentially, a proxy server consists of a protocol client and a protocol server back to back. After receiving a SIP request message, the proxy server first selects the next hop server, modifies the value of some message fields, and then forwards the message. The proxy server can be stateful or stateless, meaning that the proxy server does not have to maintain the state of a session or call, but sometimes it can maintain the state of a SIP transaction.

The redirect server (Redirect Server) 104 receives the SIP request and puts the in-place request The address maps to zero or more addresses and is returned to the client, which resends the request based on this address.

The Registrar Server 105 receives the registration request sent by the user agent client.

The Location Server 106 provides the proxy server or redirect server with the location information currently available to the called party. The specific way the network server accesses the location server is not within the scope of the SIP protocol.

In the actual call processing service, the proxy server cooperates with two types of devices to complete the call processing: the client device and the central office device. The client device is a user agent device (UAC and UAS), and the central office device is another proxy server (Proxy Server). In addition, the nomadic function of the client device is an important feature of the session initiation protocol, and the proxy server should support this feature. Summary of the invention

The technical problem to be solved by the present invention is to provide a framework of a proxy server based on a session initiation protocol and an implementation method thereof, which can support the nomadic function of the client device of the session initiation protocol without reducing the data configuration of the proxy server, and reduce data. The complexity of the configuration facilitates data maintenance and improves system efficiency.

In order to solve the above problem, the present invention provides a proxy server based on a session initiation protocol, which acts as an agent for an external user agent and an external user proxy server, and performs transfer and forwarding of the session initiation protocol, including: a network forwarding module (Network Transmiting) Module (NTM), one or more Protocol Processing Modules (PPMs), where:

The network forwarding module is configured with the correspondence between the IP address of the external user agent and the corresponding protocol processing module, and initiates a protocol flow for the received central office session sent by the external proxy server, according to the CALLID of the session initiation protocol message (call identifier) ), distributing the protocol message to any one of the protocol processing modules; for the received user sent by the external user agent End session initiation protocol flow, according to the configured IP address of the user agent and the corresponding relationship of the corresponding protocol processing module, the session initiation protocol flow is sent to the corresponding protocol processing module;

The protocol processing module initiates a protocol flow directly to the received central office session sent by the external proxy server, and directly performs protocol processing on the received client session sent by the external user agent, and parses the user identifier. If the protocol processing module has corresponding user data, the protocol processing module completes the protocol processing.

The proxy server of the present invention may further include:

One or more Protocol Location Registers (PLRs) are configured with protocol-related data and corresponding authentication data, and implement data storage and query based on the session initiation protocol;

The protocol processing module is further configured with a correspondence between an AOR (AOR) information and a protocol location register module, if the protocol processing module does not have corresponding user data, and if the protocol message Is a registration message, the protocol processing module determines a corresponding protocol location register module by recording a correspondence between the user agent record address information and the protocol location register module, and the user agent authentication is performed by the protocol location register module. Record the binding relationship between the user agent IP address and the corresponding protocol processing module.

The proxy server of the present invention, wherein if the protocol processing module does not have corresponding user data, and the protocol message is not a registration message, the protocol processing module treats it as an error message.

The proxy server according to the present invention, wherein the protocol location register module further transmits the user agent data required by the session initiation protocol to the protocol processing module in the response message, and is saved by the protocol processing module.

According to the proxy server of the present invention, after receiving the externally initiated session initiation protocol flow, the network forwarding module determines that the session initiation protocol flow is sent by the external proxy server by querying the IP address of the message source. Come, still sent by an external user agent.

The invention also proposes an implementation method of the proxy server based on the session initiation protocol The method is to proxy the external user agent and the external user proxy server, and perform the transfer and forwarding of the session initiation protocol, which mainly includes the following steps:

Configuring a corresponding relationship between an IP address of the external user agent and a corresponding protocol processing module in the network forwarding module;

The network forwarding module initiates a protocol flow to the received central office session sent by the external proxy server, and distributes the protocol message to any one of the protocol processing modules according to the CALLID of the session initiation protocol message;

The network forwarding module initiates a protocol flow to the received client session sent by the external user agent, and sends the session initiation protocol flow to the corresponding one according to the configured IP address of the user agent and the corresponding relationship of the corresponding protocol processing module. Protocol processing module;

The protocol processing module sends a protocol flow to the received central office session sent by the external proxy server, and directly completes the protocol processing;

The protocol processing module sends a protocol flow to the received client session sent by the external user agent, and parses the user identifier. If the protocol processing module has corresponding user data, the protocol processing module completes the protocol processing.

The method of the present invention may further include:

And configuring, in the protocol processing module, a correspondence between the user agent record address information and the protocol location register module, where the protocol related data and the corresponding authentication data are configured in the protocol location register module;

If the protocol processing module does not have corresponding user data, and if the protocol message is a registration message, the protocol processing module determines a corresponding protocol location register module by recording a correspondence between the user agent record address information and the protocol location register module. And the protocol location register module performs user agent authentication on the message, and records the binding relationship between the user agent IP address and the corresponding protocol processing module.

The method of the present invention, wherein if the protocol processing module does not have corresponding user data, and the protocol message is not a registration message, the protocol processing module processes it as an error message. The method of the present invention, wherein the protocol location register module further transmits user agent data required by the session initiation protocol to the protocol processing module in the response message, and is saved by the protocol processing module.

The method of the present invention, after receiving the externally initiated session initiation protocol flow, the network forwarding module determines that the session initiation protocol flow is sent by the external proxy server by querying the IP address of the message source. It is still sent by an external user agent.

According to the method of the present invention, the network forwarding module distributes the protocol message to a corresponding protocol processing module according to a certain algorithm according to a CALLID of the session initiation protocol message.

The invention separately processes the client device and the central office device that interact with the proxy server, and mainly realizes that the proxy server can support the nomadic function of the client device of the session initiation protocol without changing the data configuration, thereby reducing the complexity of data configuration. Degree, easy to maintain data, while improving system efficiency. BRIEF abstract

Figure 1 is a schematic diagram of a session initiation protocol;

2 is a direction diagram of a proxy server receiving protocol stream processing according to an embodiment of the present invention;

3 is a flow chart of proxy server protocol processing in accordance with an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The architecture of the proxy server based on the session initiation protocol of the present invention and an implementation method thereof will be described below with reference to the accompanying drawings. '

As shown in FIG. 2, the architecture device of the proxy server based on the session initiation protocol of the present invention includes:

The network forwarding module (NTM) 201 is configured with the correspondence between the IP address of the external user agent and the corresponding protocol processing module, and the received central office sent by the external proxy server. The session initiation protocol flow distributes the protocol message to any one of the protocol processing modules according to the CALLID (call identifier) of the session initiation protocol message;

Sending a protocol flow to the received client session sent by the external user agent, and sending the session initiation protocol flow to the corresponding protocol processing module according to the configured IP address of the user agent and the corresponding relationship of the corresponding protocol processing module .

Protocol Processing Module (PPM) 202, the system has one or more PPM modules, configured with a correspondence between the user agent record address information and the protocol location register module, and is initiated by the received central office session sent by the external proxy server. Protocol flow, directly complete the protocol processing;

Initiating a protocol flow for the received client session sent by the external user agent, parsing the user identifier, and if the protocol processing module has corresponding user data, the protocol processing module completes the protocol processing;

If the protocol processing module does not have corresponding user data, and if the protocol message is a registration message, the protocol processing module determines a corresponding protocol location register module by recording a correspondence between the user agent record address information and the protocol location register module. And the user location authentication is performed by the protocol location register module, and the binding relationship between the user proxy IP address and the corresponding protocol processing module is recorded;

If the protocol processing module does not have corresponding user data and the protocol message is not a registration message, it is processed by the protocol processing module as an error message.

The Protocol Location Register (PLR) 203 is configured with protocol-related data and corresponding authentication data, and implements data storage and query based on the session initiation protocol, and further sends a user agent required for the session initiation protocol to the protocol processing module in the response message. Data, and saved by the protocol processing module.

As shown in FIG. 3, for the session initiation protocol message in the architecture of the proxy server based on the Session Initiation Protocol of the present invention, the processing method of the present invention is as follows:

Step 1. Configure the corresponding data in the physical entity of each module of the proxy server, configure the IP address and corresponding protocol of the external user agent (User Agent) in the network forwarding module (NTM). Corresponding relationship between the processing boards, configuring the correspondence between the AOR (AOR) information and the protocol location register PLR module in each protocol processing module (PPM); configuring protocol-related data on each protocol location register and Corresponding to the authentication data; the system is powered on;

Step 2. The session initiation protocol flow outside the system enters the network forwarding module (NTM); Step 3. The network forwarding module (NTM) queries whether the IP address of the message source is a proxy server (Proxy Server), if not a proxy server (Proxy Server) Go to step 5, otherwise continue to step 4;

Step 4. Connect to step 3, for the central office session initiated protocol flow sent by the external proxy server (Proxy Server), the network forwarding module (NTM) distributes the protocol message according to a certain algorithm according to the CALLID of the session initiation protocol message. Protocol processing module PPM (the central office message does not need to configure user information);

Step 5. After step 3, the network forwarding module (NTM) queries whether the IP address of the message source is a user agent. If it is not the user agent, the process proceeds to step 8, otherwise step 6 is continued;

Step 6. Connect to step 5, initiate a protocol flow for the client session sent by the user agent, and the network forwarding module (NTM) according to the configured user agent (User Agent) IP address and corresponding protocol processing module ( Corresponding relationship of PPM), distributing the session initiation protocol flow to a corresponding protocol processing module (PPM);

Step 7. After step 6, the protocol processing module (PPM) parses the protocol to determine whether there is corresponding user data, if there is corresponding user data to go down step 13, otherwise go to step 9;

Step 8. Step 5: 9. The network forwarding module (NTM) performs special processing on the message;

Step 9. Step 7 is performed, the protocol processing module (PPM) parses the protocol, and determines whether it is a registration message. If it is not a registration message, step 8 is performed, otherwise step 10 is performed; Step 10. Step 9 is a registration message, and the protocol processing module (PPM) determines the corresponding protocol location register (PLR) module by referring to the user agent (AOR) information, and forwards the protocol message to the corresponding protocol location register (PLR). )

Step 11. After step 10, the protocol location register (PLR) processes the message, and sends relevant user data to the protocol processing module (PPM) in the response message;

Step 12. Connect to step 11, the Protocol Location Register (PLR) saves the user data; Step 13. Step 4, 7, the Protocol Processing Module (PPM) performs final processing on the protocol;

Step 14. Continue with steps 12 and 13, and complete this process.

Although the disclosed architecture apparatus and its implementation method for providing a session initiation protocol based proxy server are specifically described with reference to the embodiments, it will be understood by those skilled in the art without departing from the scope and spirit of the invention. It can be variously modified in form and detail. For example, the essence of the technical solution of the present invention also applies to the subsequent session initiation protocol of the RJFC3261 protocol caused by the IETF's perfection and update of the session initiation protocol. Accordingly, the above-described embodiments are to be considered as illustrative and not restrictive, and all changes and modifications are within the scope of the invention. Industrial applicability

The present invention separately processes the client device and the central office device that interact with the proxy server. For the protocol message from the central office device (other proxy server Proxy Server), the CALLID is distributed. Since the session initiation protocol message interacting with the central office device does not contain user data, but must contain the CALLID, it can be distributed to the CALLID only. The protocol processing module (PPM) completes the processing of the protocol. Since the CALLID parsing does not need to parse all the content of the session initiation protocol, the parsing efficiency can be improved, and the CALLID is distributed to any protocol processing module for processing, and the distribution mechanism is simple. For the protocol message from the client device, the user data is required to process the protocol, because the session initiation protocol itself is granular. The degree is only related to a single user, not related to the user's device. Even if the registration and call of the same device user are processed one by one according to the granularity of a single user, the present invention sets the protocol location register (PLR) module at the user end. When the session initiation protocol message of the device reaches the network forwarding module, the protocol message is distributed to the protocol processing module (PPM) by using an algorithm related to the IP address of the client device, and the protocol processing module (PPM) finds the protocol of the client device. The message is obtained by protocol parsing to obtain a single user identifier, and then interacts with the protocol location register (PLR) module to dynamically download the user data related to the user-specific single user granularity from the protocol location register (PLR), and the proxy server can configure the data without changing the data. The nomadic function of the client device supporting the session initiation protocol reduces the complexity of data configuration and facilitates data maintenance. At the same time, due to the single user granularity attribute of the session initiation protocol, the single download data traffic is not large, and the download bandwidth is not formed. Bottleneck Low efficiency of the system, and subsequent processing is performed.

Claims

Claim

A proxy server based on a session initiation protocol, which acts as an agent for an external user agent and an external user proxy server, and performs transfer and forwarding of a session initiation protocol, and is characterized in that: a network forwarding module, one or more protocols a processing module, wherein: the network forwarding module is configured with an IP address of the external user agent and a corresponding relationship of the corresponding protocol processing module, and initiates a protocol flow to the received central office session sent by the external proxy server, according to the session initiation protocol message CALLID, distributes the protocol message to any protocol processing module; initiates a protocol flow for the received client session sent by the external user agent, and according to the configured IP address of the user agent and the corresponding relationship of the corresponding protocol processing module, Sending the session initiation protocol flow to the corresponding protocol processing module;

2. The proxy server according to claim 1, further comprising: one or more protocol location register modules configured with protocol related data and corresponding authentication data, and implementing data storage and query based on a session initiation protocol;

The protocol processing module is further configured with a correspondence between the user agent record address information and the protocol location register module. If the protocol processing module does not have corresponding user data, and if the protocol message is a registration message, the protocol processing module The corresponding protocol location register module is determined by recording the correspondence between the user agent record address information and the protocol location register module, and the user agent authentication is performed on the message by the protocol location register module, and the user agent IP address and the corresponding protocol are recorded. Handle the binding relationship between modules.

3. The proxy server according to claim 1, wherein if the protocol processing module does not have corresponding user data, and the protocol message is not a registration message, the protocol processing module processes the error message as an error message. .

4. The proxy server according to claim 2, wherein the protocol location register module further transmits user agent data required by the session initiation protocol to the protocol processing module in the response message, and is saved by the protocol processing module. .

The proxy server according to claim 1, wherein the network forwarding module determines, after the externally initiated session initiation protocol flow, the IP address of the message source to determine that the session initiation protocol flow is Transmitted by an external proxy server or sent by an external user agent.

6. The method for implementing a session initiation protocol based proxy server according to claim 1, wherein the external user agent and the external user proxy server are proxyed, and the session initiation protocol is forwarded and forwarded, and the method includes the following Step - configuring the correspondence between the IP address of the external user agent and the corresponding protocol processing module in the network forwarding module;

7. The method of claim 6, further comprising:

Configuring, in the protocol processing module, a correspondence between the user agent record address information and the protocol location register module, where the protocol related data and the corresponding authentication data are configured in the protocol location register module; If the protocol processing module does not have corresponding user data, and if the protocol message is a registration message, the protocol processing module determines a corresponding protocol location register module by recording a correspondence between the user agent record address information and the protocol location register module. And the protocol location register module performs user agent authentication on the message, and records the binding relationship between the user agent IP address and the corresponding protocol processing module.

8. The method of claim 6, wherein if the protocol processing module does not have corresponding user data and the protocol message is not a registration message, the protocol processing module processes it as an error message.

9. The method of claim 7, wherein the protocol location register module further transmits user agent data required by the session initiation protocol to the protocol processing module in the response message and is saved by the protocol processing module.

The method according to claim 6, wherein the network forwarding module determines that the session initiation protocol flow is determined by querying an IP address of the message source after receiving the externally initiated session initiation protocol flow. The external proxy server sends it or is sent by an external user agent.

The method according to claim 6, wherein the network forwarding module distributes the protocol message to a corresponding protocol processing module according to a CALLID of the session initiation protocol message according to a certain algorithm.