Improvements in or relating to codec negotiation and selection

H - Electricity – 04 – W

Patent

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H04W 76/02 (2009.01) H04W 28/18 (2009.01)

Patent

CA 2696284

A method of modifying a call set up message for a call from a first terminal to a second terminal, the call set up message being sent from the first terminal (Mobile Station, MS) to a network node (e.g. MSC server, MSC-S) via an intermediate node (e.g. BSC or RNC) which handles at least some signaling or traffic associated with the call, wherein the network node is responsible for negotiating call set up requirements, the method comprising the steps of : intercepting the call set up message at the intermediate node (indicating codec list); identifying one or more codec preferences and capabilities associated with the intermediate node; modifying (e.g. by appending, removing, deleting, inserting or reordering the list) the call set up message based on information relating to said preferences or capabilities; and sending the modified call set up message to the network node.

L'invention porte sur un procédé de modification d'un message d'établissement d'un appel pour un appel d'un premier terminal à un second terminal, le message d'établissement d'appel étant envoyé du premier terminal (Station Mobile, MS) à un noed de réseau (par exemple, serveur MSC, MSC-S) par l'intermédiaire d'un noed intermédiaire (par exemple, BSC ou RNC) qui traite au moins une certaine signalisation ou un certain trafic associé à l'appel, le noed de réseau étant responsable de la négociation des exigences d'établissement d'appel, le procédé comprenant les étapes consistant à : intercepter le message d'établissement d'appel au niveau du noed intermédiaire (indiquant une liste de codec); identifier une ou plusieurs préférences de codec et capacités associées au noed intermédiaire; modifier (par exemple, par ajout, retrait, suppression, introduction ou réagencement de la liste) le message d'établissement d'appel sur la base des informations apparentées auxdites préférences ou capacités; et envoyer le message d'établissement d'appel modifié au noed de réseau.

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