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SIP is one of the most important
VoIP signaling protocols operating in the application layer . SIP can perform
both unicast and multicast sessions and supports user mobility. SIP handles
signals and idenitifies user location , call setup, call termination and busy
signals. SIP can use multicast to support conference calls and use the Session
Description Protocol(SDP) to negotiate parameters.
SIP Components
Although SIP works in conjunction
with other technologies and protocols, there are two fundamental components
that are used by the Session Initiation Protocol:
■User agents, which are endpoints
of a call (i.e., each of the participants in a call)
■ SIP servers, which are
computers on the network that service requests from clients, and send back
responses
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