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Securing the signaling protocol and controlling access to vary multimedia services are important issues for Internet Multimedia Communications (IMC) using Session Initiation Protocol (SIP). This paper proposes an elegant Dual-Level Identity and Authentication Model for IMC. Using this new model, a new Virtual Multimedia Network could be built to provide a significant increase for security multimedia communications in public Internet. An example for SIP based infrastructures with trusted computing technologies is illustrated. Multimedia communication is enabled in the Internet by many IP-based application-level protocols. The signaling protocols and the media transport protocols play a major role in all the multimedia communication systems.
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