Implementing method for H248 protocol to get through NAT device

Abstract

The invention discloses a realization method for the H248 protocol through an NAT device, which adopts keyword search and matching mode to replace the internal network address information in the signaling message load and then automatically creates a conversation connection on an NAT device to connect the RTP/RTCP channel between the MG/IAD on the inside user network of the NAT device and the media gateway control server (MGC); finally, an NAT task makes a choice on message forwarding path towards the RTP/RTCP message of the internal network according to the configuration; a first choice, the message is directly forwarded to the internal network, thereby realizing the exchange between the internal network media gateways while the internal network media gateway still uses a public network address which is registered onto the MGC of the public network; a second choice, the message is forwarded to the public network, thereby realizing the exchange with the public network media gateway. The method improves the forwarding rate of the message in the use process, occupies less system resources and simplifies the configuration tasks.

Description

Technical field: [0001] The invention relates to the field of data communication, in particular to a method for realizing NGN network service traversing NAT equipment through the H248 protocol. Background technique: [0002] At present, NGN (Next Generation Network) network is gradually moving from experiment to commercial use. The reason is that the NGN network can provide users with rich services, especially the IP Centrex service that integrates voice, data and video for enterprise users. [0003] However, many practical problems have appeared in the actual application process, especially the access problem of NGN users. NGN is a network based on a packet network. Access users are addressed through IPv4 addresses. Due to the current shortage of IPv4 addresses and the lack of security in the network, a large number of enterprise networks and resident networks basically use private IP addresses through egress NAT. / FW access to the public network. [0004] However, in th...

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of implementation method of H248 protocol traversing NAT equipment, to solve the problem that H248 protocol carries voice and video protocol control channel or media channel on IP, it is difficult to pass through traditional NAT equipment in private network user access application The problem of intercommunication with the public network, and the innovative method of keyword matching and replacement, does not require NAT devices to support the H248 protocol stack, and does not need to decode the H248 protocol stack, which greatly improves the performance of message traversal

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