H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/12 (2006.01) H04L 12/66 (2006.01) H04L 29/02 (2006.01) H04L 29/06 (2006.01)
Patent
CA 2415357
The present invention relates to a communications system (1) for making multimedia calls. The system comprises two multimedia terminals (10, 12) and communication means for making a multimedia call over a shared communications network (20), including a firewall (26) through which the multimedia call must pass, and which restricts certain types of communication. Each terminal (10, 12) has a number of logical communication ports for the multimedia call, including at least one dynamically assigned port. In the course of setting up the multimedia call, at least one of the terminals (10, 12) is adapted to send a request to the other of the terminals to open up one or more of the dynamic ports in the other terminal. The system includes a proxy server (40) between the terminals (10, 12) that acts for each terminal as a proxy for the other terminal during the course of the call. The proxy server (40) has logical communication ports for communication with the terminals including one or more pre-assigned ports. The firewall (26) is configured not to restrict communication between one or both terminals (10, 12) and the pre-assigned port(s) of the proxy server (40). The proxy server (40) is configured to receive and forward the request(s) to open up said dynamic port(s) via one of its pre-assigned ports.
La présente invention se rapporte à un système de communications (1) permettant d'établir des communications multimédia. Ce système comprend deux terminaux multimédia (10, 12) et des moyens de communication permettant d'établir une communication multimédia par l'intermédiaire d'un réseau de communications partagé (20), comportant un coupe-feu (26) à travers lequel la communication multimédia doit passer et qui restreint certains types de communication. Chaque terminal (10, 12) possède un certain nombre de ports logiques de communication pour la communication multimédia, comprenant au moins un port à affectation dynamique. Au cours de l'établissement de la communication multimédia, au moins un des terminaux (10, 12) est adapté pour envoyer une requête à l'autre terminal pour ouvrir un ou plusieurs ports dynamiques de l'autre terminal. Le système comprend un serveur mandataire (40) entre les terminaux (10, 12) qui sert à chaque terminal de mandataire de l'autre terminal au cours de la communication. Le serveur mandataire (40) possède des ports logiques de communication, dont un ou plusieurs pré-affectés, lui permettant de communiquer avec les terminaux. Le coupe-feu (26) est conçu pour ne pas restreindre la communication entre l'un des terminaux (10, 12), ou les deux, et les ports pré-affectés du serveur mandataire (40). Le serveur mandataire (40) est conçu pour recevoir et transmettre les requêtes d'ouverture desdits ports dynamiques par l'intermédiaire de l'un de ses ports pré-affectés.
Marks & Clerk
Ridgeway Systems And Software Limited
Tandberg Telecom Uk Limited
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