About the SIP Protocol

The session initiation protocol (SIP) is a simple network signalling protocol for creating,
modifying, and terminating sessions with one or more participant. The SIP protocol is
designed to be independent of the underlying transport protocol, so SIP applications can
run on TCP, UDP, or other lower-layer networking protocols.

Typically, the SIP protocol is used for internet telephony and multimedia distribution between
two or more endpoints. For example, one person can initiate a telephone call
to another person using SIP, or someone may create a conference call with
many participants.

The SIP protocol was designed to be very simple, with a limited
set of commands. It is also text-based, so human can read the SIP
messages passed between endpoints in a SIP session.

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