Multimedia communication method, system and apparatus traversing network address conversion equipment

Abstract

The invention provides a multi-media communication method of passing through a network address translation NAT equipment. The method includes that a private network terminal is set in signaling connection with a public network terminal, then informs the public network terminal that the public network terminal has NAT property and transmits media streams to the public network terminal through the NAT equipment; after obtaining that the private network terminal has NAT property the public network terminal takes the source addresses and the ports of the received media streams as the target addresses and the target ports and then transmits media streams to the private network terminal through the NAT equipment. In addition, the invention also provides a multi-media communication system passing through the NAT equipment, a private network terminal and a public network terminal. In the network containing the NAT equipment, the invention can guarantee the normal multi-media communication process between the private network terminal and the public network terminal.

Description

technical field [0001] The present invention relates to a network communication technology, and in particular, to a multimedia communication method, system and device that traverses a network address translation (NAT, Network Address Translation) device. Background technique [0002] NAT is an Internet Protocol (IP, Internet Protocol) address translation technology, which is mainly used for private networks to access public networks. It converts the private network IP address in the IP packet header to the public network IP address and provides privacy protection for the private network. . Network Address Port Translation (NAPT, NetworkAddress Port Translation) can not only change the IP address of the packet, but also change the port of the packet, allowing multiple private network addresses to be mapped to different ports of the same public network address. Multiple private network computers share a public network IP address to solve the problem of shortage of public netw...

AI Technical Summary

Problems solved by technology

However, since the private network address cannot be routed by the public network terminal, the media stream of the public network terminal cannot be sent to the private network terminal, resulting in the failure of multimedia communication between the private network terminal and the public network terminal

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