The presence enabler aggregates presence information from a number of different sources in a persistent manner and publishes the presence information to a number of different sources. The Presence & Location management enabler establishes a way for services to change their behavior depending on the user's location and availability. This makes it possible to send calls or messages to an active device and to avoid interrupting the user. Presence & Location management stimulates communication between users and provides enhanced and more attractive communication applications that can be monetized by telecommunications operators.