We are now seeing tremendous acceleration in the adoption of mobile broadband services. This phenomenal growth is primarily due to powerful new devices and applications, such as video and peer-to-peer, as well as flat rate billing plans and high speed networks that are optimized for IP traffic. Smart phones now account for more than 20% of global handset sales with industry predictions to go as high as 40% in the next 4-5 years. This whitepaper explores the Diameter proxy function.