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Transmission calling method for multimedia communication

A calling method and multimedia technology, applied in user signaling identification equipment, telephone structure, hybrid switch system, etc., can solve the problems of multimedia communication, multiplexing of multimedia communication terminals, and other terminals cannot use public network IP addresses, etc. problems, to achieve the effect of saving public network IP address resources

Inactive Publication Date: 2005-06-29
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0007] However, both of the above two technical solutions cannot achieve multiple multimedia communication terminals in the private network to reuse one public network IP address, that is: once a certain public network IP address is fixedly assigned to a certain private network terminal, the terminal Before the end of the multimedia communication, other terminals cannot use this public network IP address
This causes a waste of public network IP address resources when there are many terminals (or other H.323 nodes) in the private network
[0008] In addition, in the NAPT (Net Address Port Translation: Network Address Port Translation) mode, there is still no technical solution to solve the problem of multimedia communication failure due to the UDP packet being rejected by the NAT device.

Method used

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  • Transmission calling method for multimedia communication
  • Transmission calling method for multimedia communication
  • Transmission calling method for multimedia communication

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Embodiment Construction

[0033] The present invention will be described in detail below by taking H.323, the most widely used protocol among multimedia communication protocols, as an example.

[0034] Please refer to figure 1 , which is a system networking diagram of the present invention, including: a public network terminal T3, a GK for managing the public network terminal T3, private network terminals T1 and T2 conforming to the H.323 protocol, computer terminals PC in the private network, and The NAT device used to connect the private network and the public network. This system connects the public network and the private network through the NAT device, and then establishes a communication channel between the public network terminal T3 and the private network terminal T1 and T2. When the private network terminal calls, the NAT device ensures the establishment of the call by modifying the signaling.

[0035] The following will be combined figure 2 , image 3 and Figure 4 Describe in detail the...

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Abstract

The present invention relates to a kind of transmission call method that is applied in the multimedia communication, and it comprises the following steps: A. judging whether the private network terminal is called by alias, if yes, then register to GK (Gate Keeper: gatekeeper) on the public network, Otherwise, start calling directly; B. Establish a call between the private network terminal and the public network terminal. The invention can not only solve the problem of communication failure of the multimedia communication protocol after passing through the NAT equipment, but also save the resource of the public network IP address through multiplexing.

Description

technical field [0001] The invention relates to multimedia data transmission, in particular to a method for transmitting and calling in multimedia communication. technical background [0002] In multimedia communication, multimedia communication protocols are involved, and in multimedia communication protocols, transmission of media streams (video / audio streams) is involved. [0003] In existing multimedia communication protocols, considering that in the prior art, UDP (User Data Protocol: User Datagram Protocol) is basically used to carry media streams when utilizing IP networks for media stream transmission, so most of the current multimedia communication protocols UDP is used to carry media streams. However, since UDP is a connectionless transport layer protocol, the NAT (Net Address Translation: Network Address Translation) device cannot identify the incoming (from public network to private network, such as: from the Internet to the enterprise network) UDP packets shoul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/64H04M1/26
Inventor 李颍和杨澍
Owner HUAWEI TECH CO LTD
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