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Diameter protocol is getting more and more important roles in Next Generation Mobile Network Infrastructure. However, in many cases Diameter interfaces are still under standardization. In this paper, we introduce a flexible Diameter based testing system. The strong point of this system is the capability to keep up with the development of Diameter related standards. It is also friendly, scalable and extensible. This system as well as the OpenEPC testbed are in the series of ongoing research and development activities at Fraunhofer Institute FOKUS, Germany.