Linux Journal: A Linux-Based Implementation of Mobility Using SIP
Jun 08, 2004, 13:00 (0 Talkback[s])
(Other stories by Arobinda Gupta, Sujoy Ghose, Rajarshi Chakraborty, Kishore Mundra)
"The session initiation protocol (SIP) is one of the most
popular signaling protocols used in applications that require a
session setup and parameter negotiation before actual
communication, as well as for session management and termination.
Though SIP was designed primarily for voice over IP (VoIP)
telephony, it currently is used in a variety of applications,
including those for multimedia conferencing and multimedia content
"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)..."