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Method for realizing multimedia protocol penetration network address conversion device

A network address translation and equipment technology, applied in the field of multimedia communication, can solve the problem that multimedia communication protocols cannot traverse NAT equipment, etc., and achieve the effect of saving public network IP addresses

Inactive Publication Date: 2011-09-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for implementing multimedia protocol traversing network address translation equipment, so as to solve the problem in the prior art that multimedia communication protocols cannot traverse NAT equipment in the NAPT conversion mode

Method used

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  • Method for realizing multimedia protocol penetration network address conversion device
  • Method for realizing multimedia protocol penetration network address conversion device
  • Method for realizing multimedia protocol penetration network address conversion device

Examples

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Embodiment Construction

[0024] In this embodiment, the H.323 protocol, which is the most widely used among multimedia communication protocols, is taken as an example to illustrate the present invention.

[0025] refer to figure 1 As shown, terminals T1 and T2 are H.323 terminals in the private network; terminal T3 is an H.323 terminal in the public network; GK is a gatekeeper (GateKeeper) in the H.323 protocol.

[0026] refer to figure 2 , the private network terminal T1 calls the public network terminal T2 as follows:

[0027] The private network terminal T1 sends setup signaling to the public network terminal T2;

[0028] After receiving the setup sent by the private network terminal T1, the public network terminal T2 responds to the connection (connect) signaling to the private network terminal T1;

[0029] T1 establishes an H.245 connection with the public network terminal T2 through the H.245 address of the public network terminal T2 carried in the connect signaling, and then T1 and T2 excha...

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Abstract

The invention discloses a realization method for a multimedia protocol to pass through network address conversion equipment, which comprises the steps that: a private network terminal sends a request message to a public network terminal connected with the private network and obtains a source address of a sent media stream; the private network terminal sends a redirection packet to the source address, wherein, the source address in the redirection packet is a private network IP address and an access port number of the private network terminal; NAT equipment replaces the source address in the redirection packet by a public network address that is sent to the public network terminal and establishes mapping relationship between a source address and a destination address of the redirection packet and the source address and the destination address of the redirection packet after being replaced; by taking the public network address as thte destination address, the public network terminal sends the media stream; the NAT equipment maps the destination address of the media stream to the address of a private network inner terminal according to the mapping relationship.

Description

technical field [0001] The invention relates to multimedia communication technology, in particular to a realization method of multimedia protocol traversal network address conversion equipment. 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 transport 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 NAT shut out. Eventually lead to the failure of multimedia communication. [0003] NAT device address translation methods are divided into: static NAT translation, dynamic NAT t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L29/12
Inventor 杨澍
Owner HUAWEI TECH CO LTD
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