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The IP Multimedia Subsystem (IMS) is a key component of 3G networks. It enables the seamless provision of multimedia services to end-users. Multimedia conferencing is an important category of multimedia services in IMS. It is the basis of a wide range of multiparty applications including audio/video conferencing, multiparty gaming and distance learning. Floor control is an important feature of multimedia conferencing. It manages the access to shared resources such as audio and video channels. This paper proposes a novel architecture for floor control in IMS. The architecture is an add-on to the IMS conferencing architecture. It includes a comprehensive set of server side and client side API that exposes the floor control capabilities to application developers.
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