Abstract
Multimedia multiuser applications such as the desktop multimedia conference, computer supported cooperative working, tele-education, and tele-medicine require more complex and dynamic communication services than the conventional single-medium point-to-point applications. In order to support those applications effectively, the underlying communication system should be able to support more structured and dynamically controlled call control services. Otherwise, the complexity of managing complex communication services should be resolved by the applications, and this increases the burden of individual application development. This paper presents an advanced call model that defines how the underlying communication services can be abstracted, structured, and dynamically controlled in order to support the multimedia multiuser applications effectively. The concept of communication resource abstraction, and superior structuring and controlling capability of the proposed call model, allows various multimedia multiuser applications to be supported more effectively and flexibly in various communication environments.
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