A device for use in a multimedia conferencing system comprises an audio analysis processor (340), a session type classification processor (310) and a user interface controller (300). The audio analysis processor (340) is configured to analyze audio data of a communication session with multiple participating endpoints. The session type classification processor (310) is configured to determine a type of the communication session on the basis of the analysis of the audio data. The user interface controller (300) is configured to control a representation of the endpoints in a user interface on the basis of the determined type of the communication session, e.g., by sending control data (CD) to the endpoints.