Enabling mobility in IP networks is an important issue for making use of the many light weight devices appearing at the market. The IP mobility support being standardized in the IETF uses tunnelling of IP packets from a home agent to a foreign agent to make the mobility transparent to the higher layer. There are a number of problems associated with mobile IP, such as triangular routing, each host needing a home IP address, tunnelling management, etc. In this paper, we propose to use mobility support in the application layer protocol SIP where applicable, in order to support real time communication in a more efficient way.
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