Not sure what the status is now, but the <a href="https:&#x2F;&#x2F;sipsorcery.codeplex.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;sipsorcery.codeplex.com&#x2F;</a> project (&quot;C# SIP protocol stack&quot;) withered after they implemented their admin UI in Silverlight.<p>After a bit of digging all the pieces required for self-hosting appear to still be there.