The IMS (IP Multimedia Subsystem) is the future trend that will merge the Internet with the cellular world. However, a majority of legacy devices today and future lack coherent support for next generation networked multimedia services. The goal of this book is to find a way to access IMS services for non-IMS devices, especially for the mobile phone devices. In this book, we proposed a browser-based IMS System Architecture for the non-IMS devices to access IMS services. The system architecture mainly focuses on portable non-IMS devices, but it is also compatible with fixed devices. Besides, we also proposed several technical solutions to the problems in security, provisioning, identity management, inter- working, and device management. To evaluate the architecture we implemented three IMS use cases: IMS Registration, Presence service, and Page mode Instant Message. Based on the testing result, we validate the possibility of the system architecture. The work also outlines a roadmap for future potential works and system extensions.

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