The continuous technological advances in networking and multimedia systems stimulate the integration of real-time interactive telelectures as an imponant service of a telelearning environment. Real-time interactivity is a key technological factor for the success and dissemination of telecourses. CUI (Centre Universitaire lnformatique) at the University of Geneva and GMO (the German National lnstitute for lnformation Technology) at Bonn run real-time interactive telelectures on a regular basis for one academic year. In this paper we describe the experience we gained out of the experiment, design issues we investigated and technical problems we had to deal with.