Method and system for realizing NAT traversal

Abstract

The invention discloses a method and system for realizing NAT traversal, which relate to the communication technology field. The method comprises the following steps. A first terminal receives the signaling information sent from a second terminal wherein the signaling information carries the local address of the second terminal, the outgoing address of the NAT device at the second terminal, the forwarding address assigned by the proxy server of the second terminal, and the priorities of these three addresses. The first terminal sends a media message to the forwarding address assigned by the proxy server of the second terminal so as to establish a communication connection with the second terminal. The first terminal performs a connectivity test on the local address of the second terminal and the outgoing address of the NAT device. According to the priorities of the three addresses and the connectivity rest result, the first terminal determines whether to switch from sending the media message to the forwarding address assigned by the proxy server of the second terminal to sending the media message to the local address of the second terminal or the outgoing address of the NAT device or not. With the invention, it is possible to realize efficient traversal of various NAT devices for communication connections; and in addition, the continuous delay time is small; and the resources of the proxy server can be saved and the cost is reduced.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method and system for realizing NAT (Network Address Translation, Network Address Translation) device traversal. Background technique [0002] With the rapid development and popularization of the Internet, the number of networked devices such as computers, tablet computers, and smart phones has increased sharply, which has brought about a shortage of IP address resources. In February 2011, the Internet Corporation for Assigned Names and Numbers (ICANN) announced that IPV4 addresses were exhausted, and China's IPV4 address resources were even scarcer. Considering security and saving public addresses, a large number of enterprise networks and resident networks use private network addresses, that is, NAT technology is used to map multiple internal addresses to a legal public network address, but with different protocol port numbers and different Corresponding to the...

AI Technical Summary

Problems solved by technology

However, for both communication parties, Proxy is added as a relay during the transmission process of call control signaling and media stream. With the increase of users, the demand for Proxy is huge, and the communication cost is high.

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