A Linux Implementation of Mobility Using SIP
"SIP allows two or more participants to establish a session consisting of multiple media streams using text-based request and response messages. A user, termed a SIP endpoint, is addressed by a SIP URL in the form of an e-mail address, such as sip:firstname.lastname@example.org or sip:email@example.com. The application used for communication is called the user agent (UA). Call initiation and modification is done through INVITE messages of SIP. Two endpoints can communicate with each other directly, or they can make use of a SIP entity called the redirect server. The user first sends the request for call initiation to this server, which queries a location service to retrieve the IP address and port of the other user. The location service keeps track of the current location of the users."
(Submitted by Noel Wed Jun 9, 2004 )
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