This chapter introduces a personalized system for device independent and position aware communication. It combines the advantages of mobile universal messaging and location aware architectures, and supports its users by providing additional and helpful information. One focus is the integration into the well-known session initiation protocol to ease the implementation into existing applications. We think the combination of both approaches can support the user and help him to get more information. The chapter also focuses on how to design a modular, secure, and scalable communication system that could easily be ported to other fields of application and gives an outlook on future trends in this field.