WO2011000291A1

WO2011000291A1 - Method, device and system for associating real-time transport protocol (rtp) packets in session initiation protocol (sip) session

Info

Publication number: WO2011000291A1
Application number: PCT/CN2010/074564
Authority: WO
Inventors: 张恋; 黄蓉军; 王明武
Original assignee: 华为技术有限公司
Priority date: 2009-06-29
Filing date: 2010-06-28
Publication date: 2011-01-06
Also published as: CN101938397A

Abstract

The present invention provides a method, device and system for associating real-time transport protocol (RTP) packets in a session initiation protocol (SIP) session. The present invention is related to the field of communication and is used for associating the RTP packets in the SIP session. The method includes: the RTP packets including the SIP identifiers are received; and the SIP connection which the RTP packets belong to is determined according to the SIP identifiers in the RTP packets. The present invention can simplify the associating process, and improve the system performance and the system stability.

Description

Method, device and system for associating RTP packets in SIP session This application claims to be submitted to the Chinese Patent Office on June 29, 2009, and the application number is 200910087573. K The invention is entitled "Method, device and system for associating SIP^ tongue RTP packets" The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of communications, and in particular, to a method, device, and system for associating all RTP packets in a SIP session. Background technique

With the popularity of the Internet, applications based on IP networks are becoming more and more widespread. VOIP (Voice over Internet Protocol) is a rapidly growing business. It quantifies the signal sampled by the sound, then encapsulates the quantized data into IP packets and transmits it in real time over the Internet, providing more and better services than traditional services.

In the process of starting and destroying a session, signaling is required to control, and the SIP (Session Initiation Protocol) protocol is well supported. It is the application layer's signaling control protocol for creating, modifying, and releasing sessions for one or more participants. Although it does not describe the content and characteristics of the message itself, it can carry the message body SDP (Session Description Protocol, a description of the media properties of a session. The SDP describes in detail the process of mutual negotiation between the two parties. After the call is established (negotiated), the local and remote end will establish an RTP (Real-time Transport Protocol) flow according to the SDP result.

The VOIP recording function, that is, the recording server extracts and saves the packets in the voice stream. Specifically, after receiving one SIP signaling, the SIP is parsed first, and the content of the SDP, that is, the addresses of the RTPs, is extracted and saved; then, after the session is established, the data stream of the RTP packet is received and extracted, according to the save. The content matches the RTP, and the data stream of the RTP packet is stored in the corresponding recording file.

In the process of realizing the above VOIP recording, the inventors found that at least the following problems exist in the prior art:

In the prior art, the matching association method between RTP and SIP relies heavily on the resolution of SIP signaling and its SDP, but the session initial protocol and the real-time transmission protocol are not strongly associated protocols, and there is no between them. The coupling relationship, RTP controls its own voice stream, which is driven only by SIP signaling and works passively. In addition, in a full-flow SIP session, the IP addresses and ports of the RTP parties are not always fixed, and there may be cases where the RTP cannot match the associated SIP. Summary of the invention

Embodiments of the present invention provide a method, apparatus, and system for associating an RTP packet in a SIP, which can be associated with a simplified process and improve system performance and stability.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

A method for associating RTP packets in a SIP session, including:

Receiving a real-time transport protocol RTP packet containing a session initial protocol SIP identifier;

Determining, according to the SIP identifier in the RTP packet, the SIP connection to which the RTP packet belongs.

An application server, including:

a receiving unit, configured to receive an RTP packet that includes a SIP identifier;

a parsing unit, configured to parse the SIP identifier from the RTP packet;

And an association unit, configured to determine, according to the SIP identifier, a SIP connection to which the RTP packet belongs. A method for associating RTP packets in a SIP session, including:

Fill the SIP ID into the RTP package;

Send the RTP packet.

A terminal, comprising:

a filling unit, configured to fill the SIP identifier into the RTP package;

a sending unit, configured to send the RTP packet.

A communication system comprising:

a terminal, configured to fill a SIP identifier into an RTP packet, and send the RTP packet; an application server, configured to receive an RTP packet that includes the SIP identifier, parse the SIP identifier from the RTP packet, and then Determining, according to the SIP identifier, a SIP connection to which the RTP packet belongs.

The method, device and system for associating the RTP packet in the SIP tongue are provided by the embodiment of the present invention. When the terminal sends the RTP packet, the terminal fills the SIP identifier into the RTP packet, and after receiving the RTP packet, the server can pass the packet. The SIP identifier is quickly associated with the SIP to which the RTP packet belongs, avoiding the prior art to parse the SIP and find the IP address and port; then parsing the RTP, finding the IP address and port; and then performing the matching association. P is competing for the complexity of implementation. Also avoid The matching association failure caused by the unfixed IP address and port improves the system performance and stability. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a flow block diagram of a method for associating an RTP packet in a SIP session according to Embodiment 1 of the present invention;

2 is a structural block diagram of an application server according to Embodiment 2 of the present invention;

3 is a flow block diagram of a method for associating an RTP packet in a SIP session according to Embodiment 3 of the present invention;

4 is a structural block diagram of a terminal according to Embodiment 4 of the present invention;

FIG. 5 is a schematic flowchart of a method for associating an RTP packet in a SIP session according to Embodiment 5 of the present invention;

FIG. 6 is a schematic structural diagram of a communication system according to Embodiment 6 of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Example 1:

A method for associating an RTP packet in a SIP session, as shown in FIG. 1 , includes the following steps:

S101. Receive a real-time transport protocol RTP packet that includes a session initial protocol S I P identifier.

S102. Determine, according to the SIP identifier in the RTP packet, the SIP connection to which the RTP packet belongs.

The SIP identifier may be a call identifier (Ca ll lD ) of the SIP field or a session identifier (DialogID ) of the SIP field. The method for associating the RTP packet in the SIP session provided by the embodiment of the present invention can quickly match the SIP to which the RTP packet belongs by using the SIP identifier in the packet after the RTP packet is received, thereby avoiding parsing the SIP in the prior art. Find the IP address and port; then parse the RTP, find the IP address and port; then perform the matching association, P strives to reduce the complexity of the implementation. At the same time, the matching association failure caused by the unfixed IP address and port is avoided, which improves the system performance and stability.

Example 2:

For the first embodiment of the present invention, an application server is provided. As shown in FIG. 2, the application server includes: a receiving unit 201, a parsing unit 202, and an associating unit 203.

The receiving unit 201 is configured to receive an RTP packet that includes an identifier of the SIP;

The parsing unit 202 is configured to parse the SIP identifier from the RTP packet.

The association unit 203 is configured to determine, according to the SIP identifier, a SIP connection to which the RTP packet belongs.

Further, the above server further includes:

The recording unit 204 is configured to extract the data stream of the RTP packet and store it in the recording file corresponding to the SIP connection to which it belongs. In this way, the association between the RTP packet and the SIP can be utilized to implement the recording function.

The application server provided by the embodiment of the present invention can pass the RTP packet after receiving the RTP packet.

The SIP identity is quickly associated with the SIP to which the RTP packet belongs. This avoids the prior art to resolve the SIP and find the IP address and port. The RTP is parsed to find the IP address and port. Then the matching association is performed to reduce the association. The complexity of the implementation. At the same time, the matching association failure caused by the unfixed IP address and port is avoided, and the system performance and stability are improved.

Example 3:

A method for associating an RTP packet in a SIP session according to an embodiment of the present invention is as shown in FIG. 3, where the method includes:

5301. Fill the SIP identifier into the RTP package.

5302. Send the RTP packet.

Further, in step S301, the filling of the SIP identifier into the RTP packet may include: filling the SIP identifier into the extension header of the RTP; or filling the SIP identifier corresponding mapping table into the RTP. In the extension header.

The method for associating the RTP packet in the SIP session provided by the embodiment of the present invention, when the RTP packet is sent, the SIP identifier is filled into the RTP packet. In this way, after receiving the RTP packet, the server can quickly match the SIP to which the RTP packet belongs by using the SIP identifier in the packet, thereby avoiding the prior art to first parse the SIP, find the IP address and port, and then parse the RTP. , find the IP address and port; then perform the matching association, P strives to reduce the complexity of the implementation. At the same time, the matching association failure caused by the unfixed IP address and port is avoided, and the system performance and stability are improved.

Example 4:

For the embodiment 3, the embodiment of the present invention provides a terminal. As shown in FIG. 4, the terminal includes: a filling unit 401 and a sending unit 402.

a filling unit 401, configured to fill the SIP identifier into the RTP packet;

The sending unit 402 is configured to send the RTP packet.

The terminal provided by the embodiment of the present invention fills the SIP identifier into the RTP packet when sending the RTP packet. In this way, after receiving the RTP packet, the server can quickly match the SIP to which the RTP packet belongs by using the SIP identifier in the packet, thereby avoiding the prior art to first parse the SIP, find the IP address and port, and then parse the RTP. , find the IP address and port; then perform matching associations, reducing the complexity of the implementation. At the same time, the matching association failure caused by the unfixed IP address and port is avoided, and the system performance and stability are improved.

Example 5

The method for associating RTP packets in a SIP session provided by the embodiment of the present invention is described by taking VOIP recording as an example.

In a SIP session, after the remote and local calls are established, the RTP stream also establishes two channels. One is local to remote, 殳 is type A package, and the other is remote to local, assuming type B package. When there are multiple channels, the recording server will capture A1-B, A2-B2, A3-B3, etc. Multi-channel RTP packets.

After the SIP establishes a call, the terminal will identify the SIP identifier, that is, the call identifier of the SIP field. ( Cal l lD ) is populated into the Type A package. Here, the padding field is not limited to the Call l lD. If the session identifier (DialogID) in the service can also identify the session, the DialogID can also be used, and of course, other identifiers are also used. .

On the terminal A side, when sending RTP packets, the RTP packets need to be packaged. The RTP protocol defines an extension header, which is generally an extension of the codec. However, this extension information is rarely used in VOIP, so the RTP extension header can be used to populate the SIP identifier Cal l lD.

The extension header has 32 bits in total, but it can be divided into two parts, but it can also be used without distinction. The Cal l lD value is too long, and the extended header length is only 32 bits, so you can make a mapping table with Ca 111. D - the corresponding mapping table is filled.

After the RTP package is packaged, it is sent to the core switch, and the core switch utilizes port mirroring.

( Port Mirror ing ) method, mirroring this data to the application server (recording server). The so-called port mirroring method here is a method of mirroring data of one or more ports of a switch to another port or ports.

After receiving the RTP packet, the application server can quickly locate the SIP packets in the received A-type packets by parsing the SIP identifier in the RTP packet.

As mentioned above, after the RTP stream is in normal conversation, two channels are established, which are one-to-one. It is easy to derive the B-type packet from the A-type packet. Because in the case of duplex, type A and type B packets, their RTP stream addresses are reverse symmetric, that is, the source address of the A packet, the destination address, and the source address and destination address of the B packet, but the information is reversed. The content is the same.

Then, the application server extracts the data stream of the RTP packet and stores it in the recording file corresponding to the SIP. Similarly, A2-B2 and other paths are processed in this way, and the V0IP recording function is realized. The process is shown in Figure 5.

The method for associating the RTP packet in the SIP session provided by the embodiment of the present invention, when the terminal sends the RTP packet, the terminal fills the SIP identifier into the RTP packet, and after receiving the RTP packet, the server can quickly pass the SIP identifier in the packet. The SIP to which the RTP packet belongs is matched and matched, so that the SIP is first parsed in the prior art to find the IP address and port; then the RTP is parsed to find the IP address and port; The practice of matching associations, P strives to reduce the complexity of implementation. At the same time, the matching association failure caused by the unfixed IP address and port is avoided, and the system performance and stability are improved. In addition, in the embodiment of the present invention, the matching policy is improved, and the dependence of the recording service on the call control service is reduced in the entire system, and the existing networking and the interaction between the network elements are not changed, so the solution easy and convenient.

Example 6:

The communication system provided by the embodiment of the present invention, as shown in FIG. 6, includes: a terminal 601, an application server 602.

The terminal 601 is configured to fill the SIP identifier into the RTP packet, and send the RTP packet. The application server 602 is configured to receive the RTP packet that includes the SIP identifier, and parse the SIP identifier from the RTP packet, and then The SIP identity determines the SIP connection to which the RTP packet belongs.

In the communication system provided by the embodiment of the present invention, when the terminal sends the RTP packet, the terminal fills the SIP identifier into the RTP packet, and after receiving the RTP packet, the application server can quickly associate with the RTP packet by using the SIP identifier in the packet. SIP performs matching association, avoiding the prior art to parse SIP first, find out the IP address and port; then parse the RTP, find the IP address and port; then perform the matching association, and P strives to reduce the complexity of the implementation. At the same time, the matching association failure caused by the unfixed IP address and port is avoided, and the system performance and stability are improved.

A person skilled in the art can understand that all or part of the steps of implementing the foregoing embodiments may be performed by a program to instruct related hardware, and the related program may be stored in a computer readable storage medium, and the storage medium may be Read memory, disk or CD, etc.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A method for associating an RTP packet in a SIP session, the method comprising:

Determining, according to the SIP identifier in the RTP packet, a SIP connection to which the RTP packet belongs.

The method according to claim 1, wherein after determining the SIP connection to which the RTP packet belongs according to the S IP identifier in the RTP packet, the method further includes:

The data stream of the RTP packet is extracted and stored in the recording file corresponding to the SIP connection to which it belongs.

The method according to claim 1, wherein the SIP identifier is filled in the RTP packet by the terminal when transmitting the RTP packet.

The method according to claim 1, wherein the method further comprises: searching for the remote RTP packet in the same session in reverse according to the address of the local RTP packet.

The method according to any one of claims 1 to 4, wherein the SIP identifier comprises:

The call ID of the SIP field or the session ID of the SIP field.

6. An application server, comprising:

a parsing unit, configured to parse the SIP identifier from the RTP packet;

And an association unit, configured to determine, according to the SIP identifier, a SIP connection to which the RTP packet belongs.

The application server according to claim 6, wherein the application server further comprises:

The recording unit is configured to extract the data stream of the RTP packet and store it in the recording file corresponding to the SIP connection to which it belongs.

8. A method for associating an RTP packet in a SIP session, the method comprising:

Fill the S I P identifier into the RTP packet;

Send the RTP packet.

9. The method according to claim 8, wherein the filling the SIP identifier into In the RTP package, it includes:

Filling the SIP identifier into the extension header of the RTP; or

Filling the SIP identity mapping table into the extension header of the RTP.

10. A terminal, comprising:

a filling unit, configured to fill the SIP identifier into the RTP package;

a sending unit, configured to send the RTP packet.

A communication system, comprising:

a terminal, configured to fill a SIP identifier into an RTP packet, and send the RTP packet; an application server, configured to receive an RTP packet that includes the SIP identifier, parse the SIP identifier from the RTP packet, and The SIP identifier determines a SIP connection to which the RTP packet belongs.