Abstract
A new SIP standard based on peer to peer paradigm allows the keeping of user localization information in a decentralized way, adding flexibility to real-time mobile communications. Despite specification of terminal mobility in P2PSIP, handover procedures in transport-layer have better performance when compared with solutions in application-layer of Internet. SCTP transport protocol supports handover and a partial reliable communication service. Putting together P2PSIP and SCTP extensions, an end-to-end architecture can be proposed, aimed at the support of real-time multimedia applications with mobility requirements.
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