In this paper it is argned for the ilecessity of a plug and play functionality in speech interfaces in mobile environments. Further, a VoiceXML based plng and play dialogue management solution is introdnced. The paper focuses in partienlar on the plug and play functionality and the dynamic handling of the ping and playable dialogue management capabilities. The plug and play solution is applied in the SesaME architecture and employed within the framework of the PER demonstrator. Finally, first experiences related to the plug and play functionality of the dialogne management are discussed.