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Communication system and session establishment method

  • US 7,882,214 B2
  • Filed: 10/06/2005
  • Issued: 02/01/2011
  • Est. Priority Date: 06/24/2005
  • Status: Expired due to Fees
First Claim
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1. A communication system for performing communication with a session established between terminals via a network, comprising:

  • a receiving-side client terminal;

    an originating-side client terminal which is to establish a session with the receiving-side client terminal; and

    a communication server located within the network for establishing the session,wherein the originating-side client terminal includes a specific information for setting, in a registration message, specific information previously agreed on with a recipient and transmitting the registration message to the communication server, a conversion data memory for receiving conversion data relating to the receiving-side client terminal from the communication server and storing the received conversion data, and a session establishment requester for setting the conversion data in a first session establishment request message and transmitting the first session establishment request message to the communication server when establishing a session with the receiving-side client terminal, andthe communication server includes a conversion data generator for receiving the registration message, generating, based on an originating-side real address which is a real address of the originating-side client terminal and the specific information included in the registration message, the conversion data which the communication server alone can convert to a receiving-side real address which is a real address of the receiving-side client terminal, and transmitting the generated conversion data to the originating-side client terminal, and a session controller for receiving the first session establishment request message, getting the receiving-side real address from the conversion data and the originating-side real address included in the first session establishment request message, and transmitting a second session establishment request message to the receiving-side real address for establishing the session between the originating-side client terminal and the receiving-side client terminal,wherein the specific information is a character string or binary data of a photograph exchanged between the originating-side client terminal and the receiving-side client terminal by infrared communication,wherein the session establishment requester sets dummy information in a destination field of the first session establishment request message, and the session controller judges, on detecting the dummy information set in the received first session establishment request message, that session control should be executed to obtain the receiving-side real address based on the conversion data,wherein, when the dummy information is not set in the destination field, ordinary session establishment control is executed;

    when the dummy information is set in the destination field, the session control is executed to obtain the receiving-side real address based on the conversion data,wherein the session controller sets dummy information in a source field of the second session establishment request message in order to conceal information about the originating-side client terminal, and transmits the second session establishment request message to the receiving-side real address.

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