Firewall penetration system and method for real time media communications
US7257837B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2003 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Nov 10, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L63/029
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system for initiating and maintaining a real time audio or video media session between two clients, at least one of which has a private network IP address and is supported by a NAT firewall, comprises a proxy server serving each client and a relay server. The first proxy server may receive an invite message from a caller client to initiate a media session with a callee client. The invite message will identify the IP address and media port number of the caller client. The proxy server queries the relay server to obtain a port number of the relay server that may be used for relaying the media session between the caller client and the callee client. The proxy server will replace the IP address and port number of the caller client with the IP address and port number of the relay server in the invite message before forwarding to the callee client. When the callee client generates a response message that includes the IP address and media port number of the callee client, the proxy server will replace the IP address and media port number of the callee client in the response message before forwarding the response message to the caller client.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.