System and method for H.323 terminal communication cross the isomerous network

Abstract

The invention discloses a terminal device based on H.323 in an IPv6 network, and a system and a method among the terminal devices based on the H.323 and positioned in an IPv4 network and outside the device. The invention relates to the network communication field, and is proposed to solve the multimedia communication among the H.323 based terminal devices in a heterogeneous network. In the condition of not changing the original IPv4 device and network deployment, the problem of H.323 terminal communication in the heterogeneous network can be well solved only by adding an NAT-PT proxy device and an H.323 proxy device in the IPv6 network. In the invention, the H.323 proxy plays the function of communication transfer, and simultaneously, a static mapping of the H.323 proxy device is requiredto be provided on the NAT-PT, in order to map the v6 address to be a global unique v4 address. The invention is suitable for the media communication of the heterogeneous network.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a method for performing multimedia communication by an H.323 terminal between an IPv6 network and an IPv4 network. Background technique [0002] In recent years, VoIP has aroused people's increasing interest, and many organizations are committed to researching and formulating standards for real-time calls on IP networks. Among them, the H.323 standard is the basis of H.320 / H.324 established by ITU-T in 1996. Established on the Internet, its application goal is to realize reliable real-time applications for audio, video and data in an IP-based network environment. After years of technological development and continuous improvement of standards, H.323 has become a mature standard family accepted by the majority of ITU members and customers. Products based on H.323 can not only achieve reliable intercommunication, but also Based on H.320, H.324, the multimedia communication net...

AI Technical Summary

Problems solved by technology

[0004]The H.323 protocol itself has nothing to do with the IP layer and is applicable to both IPv4 and IPv6 networks. It can be specified in NAT-PT (Network Address Translation and Protocol Translation), although it can convert IPv4 and IPv6 addresses and ports, but it can’t do anything for H.323 data, and relying solely on NAT-PT equipment cannot make it traverse heterogeneous networks. Normal communication between H.323 terminals

[0005]Similarly, in the process of IPv6 network construction, some individuals or enterprises will deploy firewalls in the local area network using IPv6 for security reasons. When communicating on the Internet, the NAT-PT device is used for address and port translation. At this time, the terminal in the IPv6 network will not encounter any problems in multimedia communication, but when communicating with the H.323 terminal in the IPv4 public network, it cannot normal work

[0006] To enable normal communication between H.323 terminals passing through a heterogeneous network through a firewall, the usual method can be to use the H.323 Application Layer Gateway ALG (Application Layer Gateway ) method, and change the firewall device to support ALG, but this method increases the processing task of the firewall due to the analysis of the data packet load, affects the operation of the network, and becomes a potential network bottleneck; at the same time, if there are multiple layers of firewalls and NAT- PT, each firewall on the call path must be upgraded to support the ALG function, requiring changes to existing network equipment

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