You can find what you need here: http://www.filebuzz.com/findsoftware/Free_Source_Code_Soft_Phone/1.html
Now, admittedly, this was an easy search. I'm sure there are others, but I checked the DLs on this site, and they seem to be working fine - and without any bugs attached.
Check the Ozeki VoIP SIP SDK sample source code on how to create a softphone in .Net with WPF GUI at: http://www.voip-sip-sdk.com/p_122-source-code-explanation-for-a-c-open-source-voip-softphone-with-wpf-gui-using-ozeki-sip-sdk-voip.html You will found further softphone sample programs, just search this website (www.voip-sip-sdk.com).
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