Don't know how to start with SIP

am an undergraduate student studying network programming course, and we were asked to implement simple SIP based application using java and RTP sockets that at least can register and make a phone call,the problem is that i don't know how and where to start with this project ,so is there any ideas!!

To know more about SIP use the RFC. The RFC for SIP can be found in IETF organization homepage and the RFC number for SIP is 3261. Go through the RFC of SIP and write codes based on the reading.
I hope you wont have any problem with that.
do some research on SIP before you start.

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