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Diameter-Based Protocol in the IP Multimedia Subsystem

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Executive Summary

The Diameter protocol was initially developed by the Internet Engineering Task Force (IETF) as an Authentication, Authorization, and Accounting (AAA) framework intended for applications such as remote network access and IP mobility. Diameter was further embraced by the Third Generation Partnership Project (3GPP) as the key protocol for AAA and mobility management in 3G networks. The paper discusses the use of Diameter in the scope of the IP Multimedia Subsystem (IMS) as specified by 3GPP. This paper presents a solution for the problem of how to provide Authentication, Authorization and Accounting (AAA) for multi-domain interacting services by referring open diameter. The authors have studied the case of 'FoneFreez', a service that provides interaction between different basic services, like telephony and television.

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