SIP message manipulation

Hi,

My name is Thomas (21), I am student of computer engineering. Task at my school was to make a program that changing original SIP/SDP messages when using VoIP.

The task was hard, I admit to find help on the internet. I found SIP SDK that do the same. Check out if you like:
http://www.*****************/p_223-sip-sdp-message-manipulator-sample-voip.html

Think that was great. But somehow I has to change it a little not to look like cheating. According to program (SIP SDK), can you giving me advice on this?

Or other ideas are welcome also.

Greetings to everyone

So in other words, you have just cheated and you are looking for a way to alter what you have plagiarized to make it look like your own? I'm afraid you deserve the mark you are about to get.
My advice is to perform the work given to you instead of taking it externally and passing it as your own. A computer engineer student should have little difficulty to do this task.