Method and system for realizing network address convert traversing

Abstract

A method for achieving net address translation (NAT) penetration is disclosed in the invention. A first media gateway (MGW) and an interactive conduction establishing (ICE) mechanism supporting device respectively obtain candidate information from the local side and the opposite side; conduction detection is performed on the first MGW and the opposite ICE mechanism supporting device based on the candidate information; the first MGW and the opposite ICE mechanism supporting device transmit the media stream according to the conduction detection result. The embodiment of the invention further discloses a system for achieving NAT penetration. Due to the method and the system, the stability of the media stream transmission in the next-generation network (NGW) containing a media gateway controller (MGC) and MGW is improved.

Description

technical field [0001] The invention relates to the next generation network technology, in particular to a method and system for realizing network address translation (NAT) traversal in the next generation network. Background technique [0002] The Next Generation Network (NGN) is the product of the integration of the Public Switched Telephone Network (PSTN) based on Time Division Multiplexing (TDM) and the packet network based on Internet Protocol / Asynchronous Transfer Mode (IP / ATM). Integrated services such as voice, video, and data information have become possible, marking the arrival of a new generation of telecommunication network era. [0003] figure 1 It is a schematic diagram of the existing NGN network structure, such as figure 1 As shown, the NGN network mainly includes a media gateway (MGW) and a media gateway controller (MGC). Among them, MGC is used to realize the management of call state and the control of MGW bearer resources; MGW is used to convert the med...

AI Technical Summary

Problems solved by technology

However, in many cases, there is only one-way media stream in the network, for example, the ringback tone or CRBT that needs to be played by the peer end, because the called party has not picked up the phone at this time, so the calling party in the private network will not have media stream In addition, when mute detection is activated, if the user in the private network mutes, there is no media stream sent from the private network to the public network, and accordingly, the public network cannot send media streams to the private network

That is to say, under the specification defined by H.248.37, the endpoints in the private network must first send media streams to the IP endpoints on the public network, otherwise the intercommunication of media streams cannot be realized, thus affecting the efficiency of media stream transmission in the NGN network. stability

[0012] Another defect of H.248.37's NAT traversal is that it must be unidirectional. If two gateways are in two different private networks, the mechanism of NAT traversal packets will not be effective. Moreover, the H.248.37 mechanism cannot be applied to current If the private network device is the MGW, but the peer public network device is not the MGW, for example, the peer is a SIP terminal or an H.323 terminal, because the SIP protocol and the H.323 protocol do not support functions similar to H.248.37, this will also affect the The stability of media stream transmission in NGN network is affected

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