Mode shifting communications system and method

H - Electricity – 04 – B

Patent

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Details

H04B 7/005 (2006.01) H04B 1/44 (2006.01) H04L 5/16 (2006.01)

Patent

CA 2559912

A digital network based communications system that establishes communications sessions to communicate via a simulated circuit-switched environment. Exemplary embodiments communicate between a first communications station and a second communications station using Voice over Internet Protocol (VOIP) techniques. Calls are setup, maintained and torn down using Session Initiation Protocol and Session Description Protocol messages. Call modes are able to be changed between duplex (404) and simplex (416) without disconnection. Duplex calls are able to be interrupted with a request for a simplex call (406), accept the simplex call (410) or send a response message (424), and then resume the duplex call (420), all while maintaining the duplex call data communications session.

L'invention concerne un système de communications basé sur un réseau numérique, qui ouvre des sessions de communications pour communiquer par l'intermédiaire d'un environnement de commutation de circuit simulé. Des modes de réalisation exemplaires mettent en oeuvre des communications entre une première station de communication et une seconde station de communication en utilisant des techniques du protocole voix sur Internet (VOIP). Des appels sont établis, maintenus et terminés au moyen de messages de protocole d'ouverture de session et de protocole de description de session. Des modes d'appel peuvent être commutés entre une communication en duplex (404) et une communication en alternat (416), sans rupture de la communication. Un appel en duplex peut être interrompu suite à une demande d'un appel en alternat (406), accepter l'appel en alternat (410) ou envoyer un message de réponse (424), puis reprendre la communication en duplex (420), tout cela dans le cadre de la même session de communication de données.

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