7. 16. M. Kolberg and E. H. Magill, Managing feature interactions between distributed sip call control services, Computer Networks, 51 1(2), 536-557, 2007, feature Interaction. [Online]. Available: http://www.sciencedirect.com/science/article/B6VRG-4KXVB79- 1/2/d2ba17665d6f030e94ce37a2444efc63 17. W. Chiang and C. Tseng, Handling feature interactions for multi-party services in 3GPP IP multimedia subsystem, in Proc. International Conference on IP Multimedia Subsystem Architecture and Applications, December 2007, pp. 1-5. Bangalore, India. Chapter 9 Design and Implementation of an IMS-Based Testbed for Real-Time Services Orchestration and Delivery in Heterogeneous Networks Luying Zhou, Lek Heng Ngoh, Teck Yoong Chai, Teck Kiong Lee, Xu Shao, and Joseph Chee Ming Teo Contents Introduction IMS-Based Testbed 9.2.1 Open IMS Core 9.2.2 Presence Service 9.2.3 Indirection Service 9.2.4 Network Service Service Delivery Platforms 9.2.5 Security Service 9.2.6 Service Orchestration Module IMS-Based Testbed Experimentation 9.3.1 Service Orchestration 9.3.2 Multimedia Services over EPON Access Network 9.3.3 Multimedia Services over Wireless Mobile Network Integrated Telecom and IT Service Delivery Platform 9.4.1 Proposed Service Delivery Platform for Inter-Working between IMS and WS 9.4.2 Basic Operations 9.5 Conclusions References 9.1 Introduction New and innovative communication services are the latest buzzword for both tele- communication companies and network providers. In the future IP (Internet Protocol)-centric climate, all wired and wireless communications in the form of Telephony, Fax, Email, Internet access, Web services, Voice over IP (VoIP), Instant messaging, Videoconference sessions, Video on demand (VoD), and SO on can be carried in "packet frames." With such convergence anticipated, operators need a new architectural framework that embraces flexibility and expandability in intro- ducing new services as they continuously emerge and evolve, without forcing customers to frequently change carriers. To avoid develop