Car industry is evolving in a way to provide smarter and safer cars. Nowadays, embedded electronics provide users with a safer and more en- joyable traveling experience than ever before. An inescapable step in this evolution is the connection of vehicles to the Internet which open the way to an infinite number of enhancements. Basically, services related to Intelligent transport systems can be categorized into safety related and infotainment re- lated services. Some of them use the Internet while others rely on car-to-car communications. In this chapter we explain how vehicles can take advantages from wire- less communication technology diversity using IPv6 mobility protocols and standards to provide embarked applications with a full continuous IPv6 con- nectivity. Consequently, the Internet flexibility could simplify the develop- ment of various services (from security to infotainment). CALM architecture designed at ISO is described and a focus is made on the support of multiple heterogeneous communication interfaces. After a brief review of the work done in standardization bodies and in the academic world, an analysis of what should be implemented inside a vehicle is made. By the way several missing features in the IETF/IEEE stan- dards are pointed out. The chapter ends, giving some insights of what a full-featured heterogeneous networks and mobility management framework for ITS should look like.