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Realization method for obtaining media channel address in H.323 application process

A technology of media channel and implementation method, applied in the field of network communication, can solve the problems of system attack, cumbersome, unable to meet the needs of applications, etc., and achieve the effects of improving efficiency, simple extraction process and ensuring security.

Inactive Publication Date: 2009-06-17
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Using the above method to obtain the media channel address, since it is necessary to decode and analyze the PER of the H.323 protocol data unit data packet, and PER decoding is a very cumbersome process, the extraction efficiency of the media channel address is very low, which cannot meet the requirements of the application. need
[0014] Moreover, due to the complexity of the H.323 protocol, it is easy to have software implementation loopholes in the process of analyzing various H.323 signaling packets, which greatly increases the possibility of the system being attacked by abnormal packets and affects the system security

Method used

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  • Realization method for obtaining media channel address in H.323 application process
  • Realization method for obtaining media channel address in H.323 application process
  • Realization method for obtaining media channel address in H.323 application process

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Embodiment Construction

[0040] The core of the method of the present invention is to use the characteristics of the media channel address in the H.323 protocol signaling to search the entire protocol data unit data packet, so as to realize the acquisition of the media channel address.

[0041] In order to have a clear understanding of the present invention, the characteristics of the media channel address in the H.323 PDU data packet will be described below.

[0042] The described feature is specifically: the media channel address and port number of one party and the media control control channel address and port number appear continuously in the same data packet, and the interval between a byte may be 0×00 or 0×80; and the IP The addresses are the same, but the port numbers differ by one.

[0043] Such as figure 1 As shown, the data segment in the figure conforms to the above characteristics. The first 5 bytes in the figure have the same value as the 5 bytes starting from the 8th byte. It can be ...

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Abstract

This invention relates to a method for obtaining media channel direction in the H.32 application course. This invention includes: making sure and arranging the character information that the media channel direction appears in the protocol data cell data bag; then making sure the VoIP flow that fits for the related character according to the character information in the service flow; at last, obtaining the corresponding media channel direction in VoIP flow.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for realizing media channel address acquisition in the H.323 application process. Background technique [0002] In VoIP (Voice over IP) or other applications implemented based on the H.323 protocol, a media channel address needs to be dynamically negotiated during a call to exchange media stream information. [0003] The corresponding call process will be described below in conjunction with a specific application example. [0004] Taking the H.323 call between A and B as an example, the corresponding call processing flow is as follows: [0005] First, A establishes a connection to B's well-known H.323 port 1720; then, B and A send Q.931 packets on this connection. In these exchanged packets, B and A send dynamic ports for establishing the H.245 connection. [0006] Subsequently, the caller establishes an H.245 connection based on the ephemeral port negot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L12/56H04L29/12
Inventor 刘利锋郑志彬刘廷永刘淑玲尹瀚涂卫华
Owner HUAWEI TECH CO LTD
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