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To fully benefit from the all IP convergence, it should be possible for a user not only to access services ubiquitously and at any time, but also to automatically and seamlessly transfer ongoing communication between different devices. This paper investigates the problem space of supporting Session Mobility (SM) with IMS and the associated issues such as when and how to support dynamic changes in the set of devices through which the user accesses a session. It also investigates how the SM arrival calls should be handled at the network level where they are not considered as ongoing sessions. Hence, the authors discuss the design options and identify functional blocks needed to support SM.
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