The possession of mobile devices with the ”always online” paradigm eased a lot our communication habits: contacting somebody is becoming more and easier. A major drawback of this is the scenario when an important meeting is interrupted by an unexpected phone call from a friend. The need for an efficient control of unexpected incoming communication intention is immediate. This paper proposes the efficient handling of interruptions from the user modeling perspective.We propose a mechanism to build user preferences that specify the level of interrupt- ibility during an activity, situation or event. The proposed mechanism is built upon semantic technologies for dynamic and interoperability pur- poses.