If you wish to be familiar with SIP protocol
implementation then I suggest you to first read more useful information about
the background of the VoIP technology. I used some examples for my project as
well. I have found this explanation earlier:
The Session Initiation Protocol (SIP) is an
IETF-defined signaling protocol widely used for controlling communication
sessions such as voice and video calls over Internet Protocol. SIP helps in
establishing communication sessions which involve various media types such as
audio, video, or collaborative multimedia.
I mean, SIP protocol is very important to use when we
would like to build an audio or video based application. (For example: Ozeki
VoIP SIP SDK is appropriate to create SIP VoIP call services.)
The info derives from this
webpage: http://voip-sip-sdk.com/p_304-sip-protocol-implementation-voip.html.
I always use this website because this SDK has the best documentation which is
plain and transparent to understand it.
Bye,
Niko