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In this paper, we introduce an IP multimedia sub-system (IMS) based testbed which provides a platform for the study of real-time services integration and orchestration. This open-source based testbed is built on the principle of service oriented architecture (SOA), with an emphasis for real-time network services. We further developed service-oriented system functionalities such as optical network connection and bandwidth management, mobile client authentication protocols, and video streaming services. They are packaged as interoperable service components, so that they can be integrated and orchestrated through their respective standard interfaces. Finally, we elaborated our proof-of-concept environment via a use-case scenario of having various client-server interactions over a heterogeneous network environment.