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Method to establish a peer-to-peer connection between two user agents

A user agent, purpose technology, applied in the field of establishing a peer-to-peer connection between two user agents, can solve problems such as unfavorable connections, and achieve the effect of increasing security

Inactive Publication Date: 2006-08-23
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above reasons, it is disadvantageous to use a relay to, for example, establish a connection between two user agents for a telephone call via the Internet

Method used

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  • Method to establish a peer-to-peer connection between two user agents
  • Method to establish a peer-to-peer connection between two user agents
  • Method to establish a peer-to-peer connection between two user agents

Examples

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Embodiment Construction

[0050] Such as figure 1 As shown, the first 1 and the second user agent 2 are connected to the Internet 3 . Both user agents 1, 2 are behind symmetric NAT 4, 5. The proxy server 6 is located in the Internet 3 . Controllable NAT 7 is also located in the Internet. The controllable NAT 7 may be controlled by a proxy server 6, wherein the proxy server 6 is able to generate entries in the NAT table of the controllable NAT 7.

[0051] figure 2 The situation is shown when a peer-to-peer connection is established between two user agents 1 , 2 via a controllable NAT 7 . Here's how to establish this connection:

[0052] Both user agents 1 , 2 are registered with the proxy server 6 . A first user agent 1 wants to establish a connection with a second user agent 2 . To establish a connection, an invitation message is sent from the first user agent to the proxy server 6 . This INVITE message includes a first destination IP address-port pair to which the second user agent 2 will re...

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Abstract

A method to establish an Internet connection between a first (1) and a second (2) user agent is described, wherein a NAT-table entry in a controllable NAT (7) located in the Internet (3) is generated, wherein said NAT-table entry comprises public IP-address:Port pairs that are communicated to the user agents (1, 2), wherein the user agents (1, 2) use said public IP-address:port pairs for establishing an Internet connection between each other via the controllable NAT (7).

Description

technical field [0001] The present invention relates to a method of establishing an Internet connection between a first and a second user agent, each optionally located behind a symmetric NAT. [0002] The present invention is based on the priority application European Patent Application 05290348.1, which is hereby incorporated by reference. Background technique [0003] Network Address Translation (NAT) is commonly used by many service providers and entities as a way to circumvent the problem of not having enough IP (Internet Protocol) addresses. A business can have a set of IP addresses assigned to it, but the number of computers is greater than the assigned IP addresses. Alternatively, an individual may have a DSL connection with one IP address, but want to connect multiple computers to the Internet. NAT solves this problem by mapping internal addresses to external or public addresses. The internal IP address-port pair is mapped to the external IP address-port pair, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/00H04L12/28
CPCH04L61/2575H04L61/2578H04L29/12537H04L29/12009H04L65/1006H04L61/2564H04L29/06326H04L29/125H04L29/06197H04L29/12528H04L65/1069H04L29/06027H04L61/00H04L65/1104H04L65/1101
Inventor S·瓦尔
Owner ALCATEL LUCENT SAS
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