Patent ID: 7284059
Filing Date: 2007-10-16
Classification: H04L

Abstract:
1. A terminal device connected to an external device through a network, said terminal device comprising: data transmission means for transmitting predetermined data to said external device through said network; data reception means for receiving predetermined data transmitted from said external device through said network; session initiation request message generation means for generating a session initiation request message for initiating a session with said external device, the session initiation request message including first capability information of said terminal device in a predetermined format; session initiation request message transmission means for transmitting said session initiation request message to said external device through said network; response message reception means for receiving, in response to said session initiation request message, a response message from said external device; capability information analyzing means for analyzing second capability information of said external device described in a predetermined format in said response message; communication mode determination means for determining a communication mode between said terminal device and said external device through said network based on an analysis result by said capability information analyzing means and based on said first capability information; communication mode notification message transmission means for transmitting to said external device a communication mode notification message, the communication notification message including said communication mode; and control means for controlling a data conversion device, which is connected to said network, based on said communication mode, such that said data conversion device converts said data transmitted from said data transmission means into data that can be received by said external device, and such that said data conversion device converts said data transmitted from said external device into data that can be received by said data reception means, wherein said first capability information includes media format information indicating a media format that can be used by said terminal device and includes media format convertibility information indicating a media format that can be converted by said data conversion device.