A real-time collaboration platform can utilize a collaboration application, which is adapted to permit a number of users to communicate with one another in at least one session about a predetermined topic via a network. The real-time collaboration platform can include at least one media server with a selective forwarding unit adapted for selectively forwarding media streams according to a content of a predetermined session. The media server has an interface to a media gateway that is enhanced by a real-time announcement adapter via which interface the media server can be connected to an announcement system with acoustic announcement devices such that the media streams of a predetermined session can be output via the announcement devices.