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Voice over IP is a widely used concept with regard to a realization technology of different types of telephony systems, including those that are used in enterprises. Such systems consist of a call processing component and a set of desk endpoints that are pervasive from a user perspective. Those endpoints are usually not mobile, but in result can deliver a much greater set of functions needed in an everyday office work (e.g. secretary and attendant features). Those functions also make VoIP telephony systems well suited for using a context information to adapt to the situations of their users. The paper presents an approach to designing such systems from a context-aware point of view and organizing a configuration of their objects. A sample deployment has been prepared and evaluated.

The paper presents a ubiquitous system that uses semantic information to manage dynamic changes in system elements. We design the system using the Context-Controller-Action architecture that covers the main parts of ubiquitous environments, including: environment devices (such as sensors and actuators), contexts and actions, all of which may be dynamically configured during system operation. A graphical user interface for the system is supplied, which enables non-expert users to perform changes in system configuration. Internally, semantic information is used throughout the system to define a common language between devices, contexts and services. A Web services interface is used in services that handle environment devices to support their integration with the system regardless of internally used communication protocols. The architecture was implemented as a framework for developing and running applications in ubiquitous environments. We integrated a number of devices in the framework, including, RFID sensors, digital displays, cameras, electronic door locks and others. We also defined exemplary contexts and actions in the environment.

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