The third Generation of mobile networks (3G) is fast becoming a reality. One goal of 3G is to deploy a ubiquitous core network infrastructure which will provide a seamless blended service experience, extending sophisticated multimedia applications to the user. Ultimately, this network will support converged applications that meld wireless, wireline, circuit switched, and Internet Protocol (IP) based devices into a seamless extension of a users needs. The move away from circuit-switched core networks has resulted in the development and standardization of the IP Multimedia Subsystem (IMS.) The IMS defines an IP based core network that provides converged multimedia applications across both wireless and wireline devices. This paper provides an introduction to the IMS.
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