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Machine-to-machine communications are gaining tremendous interest from mobile network operators, equipment vendors, device manufacturers, as well as research and standardization bodies. Indeed, M2M is a promising technology for the development of Internet of Things communications platforms, with high potential to enable a wide range of applications in different domains. However, providing suitable answers to the issues stemming from IoT platform design requires middleware-level solutions to enable seamless interoperability between M2M-based applications and existing Internetbased services. To the best of our knowledge, available proposals in the field are still immature and tend to be proof of concept prototypes that address specific issues stemming from IoT domains. This article starts from a different perspective and aims at investigating the possibility of implementing M2M solutions on top of currently available, mature, production-level solutions. In this vein, we here present and discuss the design and implementation of an M2M application in the field of road traffic management that integrates, for the sake of efficiency, with a broad IMS-based service infrastructure.