We are interested in telephony applications, such as SIP-based applications, which the design and programming are more and more complex today. Indeed, these applications are rapidly evolving and provide a lot of communication forms (presence status, instant messaging, video-conferencing...). Our approach to design and implement such services is based on the concepts of actors, sessions and roles. We have developped MDE tools in the Eclipse environment to facilitate the design of advanced telephony applications. This demonstration shows the design, using our tools, of an instant messaging application that is based on presence status.