In collaborative working environments (CWE), context describes people, artefacts, activities and resources. One major challenge in this domain is to sense context changes. However, the integration and deployment of context sensors often poses a serious problem, since in pervasive SOA-based collaboration environment the sensor developer is not able to change 3rd party services by adding sensor modalities. To mitigate this shortcoming, our approach focuses on analysing the message exchange between service provider and service consumer. In this thesis we design and implement a toolkit that simplifies the development and deployment of SOA- based context sensors, filtering and forwarding SOAP messages as well as managing context data.