SmartKom is a multi-modal dialogue system which combines speech with
mimics and gestures. In this paper, we want to deal with one of
those  phenomena which can be observed in such elaborated systems
that we want to call `offtalk', i.e., speech that is not
directed to the system (speaking to oneself, speaking aside).
We report the classification results of first experiments
which use a large prosodic feature vector in combination
with part--of--speech information.