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In this paper, the authors provide the description of a new mobility service for an IP Multimedia Subsystem (IMS) platform. It optimizes the operation of multimedia services in a wireless heterogeneous environment containing multiple access networks with different cost per bandwidth ratio. It extends the SIP Presence Service with mobility related information, i.e. Media Independent Handover (MIH). The terminals are able to exchange specific handover knowledge with the remote service provisioning infrastructure and to receive commands adapted to the profile of all the parties involved in multimedia sessions, transparent to the actual multimedia service.
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