Hi ,<BR>As a part of my MS project I proposed a 3-party authentication protocol which can be used in SIP too. for SIP. The proxy server utilizes this protocol to&nbsp; authenticate the UC's Invite,using the Registrar server. Now, I have to estimate the totoal overhead of the scheme on a normal&nbsp; SIP call.&nbsp; I searched dozens of&nbsp; SIP, UMTS, GSM related papers to find a simulator or emulator which could be used to to achive the goal but I couldn't get any solutions as I need to consider execution of the RSA,AES and SHA on the agent's processor, I also need the solution to answer me with not too much programming due to my time constraints.&nbsp;I &nbsp;browsed the Resirocate&nbsp; project docs but I don't think then can answer me in time. I am also not sure whether SIPp, MS LIve communication server&nbsp;and SERcan help me? Could you please&nbsp;&nbsp;suggest &nbsp;me&nbsp;&nbsp;any rapid solutions? Any&nbsp;simulation techniques?any piece of software or
 programmining interface? By the way I am a little familiar with opnet as I did a tiny project with it. Doest it help me?<BR>&nbsp;<BR>Thanks in advance.<BR>Samira. <p>&#32;
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