Supporting mobile Internet multimedia applications requires more than just the ability to maintain connectivity across subnet changes. We describe how the Session Initiation Protocol (SIP) can help provide terminal, personal, session and service mobility to applications ranging from Internet telephony to presence and instant messaging. We also briefly discuss application-layer mobility for streaming multimedia applications initiated by RTSP. We begin by outlining the principles of operation of the Session Initiation Protocol (SIP) in Section II, followed by a discussion of four modes of mobility, terminal, session, personal and service mobility in Sections III through VI.
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