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Conversion of crossing medium-flow over network address

A network address translation and media streaming technology, applied in the field of traversal network address translation, can solve the problems of public network IP address waste, meaninglessness, multiplexing of multimedia communication terminals, etc., and achieve the effect of saving public network IP addresses

Inactive Publication Date: 2009-06-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing solutions, multiple multimedia communication terminals in the private network cannot reuse one public network IP address
In the case of many private network terminals (or other H.323 nodes), it will inevitably lead to a waste of public network IP addresses, making the main function of NAT equipment - saving public network IP addresses meaningless in the case of multimedia applications

Method used

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  • Conversion of crossing medium-flow over network address

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0021] The realization of this method is described in detail below in conjunction with accompanying drawing again, figure 1 Be the implementation flowchart of the present invention, as shown in the figure, the embodiment of the present invention is:

[0022] In step 101, the streaming media terminal and the streaming server determine the port information used by the streaming media terminal and the streaming server after completing the negotiation of the SET UP method through the RTSP protocol.

[0023] Step 102, the streaming media terminal sends a UDP-based RTCP RR packet to the streaming server according to the port information negotiated in step 1 and the IP address of the streaming server in the RTSP session, wherein the RTCP RR packet has no message body content.

[0024] Step 103, the streaming media server determines the IP address and port information of the streaming media terminal according to the received RTCP RR packet, and feeds back the RTCP SR packet based on t...

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Abstract

This invention discloses a media stream passing through network address conversion method, it includes: step 1: the stream media terminal and the stream media server determine the port information that media stream uses; step 2: the stream media terminal sends RTCP RR packet to the stream media server; step 3 : after the stream media server receives the RTCP RR packet of step 2, it sends feedback RTCP SR packet information to the stream media terminal; step 4: after the stream media terminal receives RTCP SR packet information, it sends request information to he stream media server; step 5 : after the stream media server receives request information, it returns the successful response, and sends media stream information to steam media terminal by using the purpose IP address and port number that RTCP SR has used in step 3. This invention sends the media stream right to steam media terminal on the condition that steam media terminal's private network address and public address don't correspond.

Description

technical field [0001] The invention relates to a method for traversing network address translation, in particular to a method for media stream traversing network address translation. Background technique [0002] Multimedia communication protocols all involve the transmission of media streams (video / audio streams), and it is more appropriate to use User Digital Protocol (UDP) to carry media streams over IP networks. Therefore, most of the multimedia communication protocols currently use UDP to carry media streams. UDP is a connectionless communication layer protocol, so the network address translation (NAT) device cannot identify which terminal in the private network the incoming UDP packet should be forwarded to, so the UDP packet sent from the public network to the private network will be blocked. NAT keeps it out. Eventually lead to the failure of multimedia communication. [0003] NAT device address translation methods are divided into: static NAT translation, dynami...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L29/06H04L29/12
Inventor 李凤军
Owner ZTE CORP
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