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Re:Show HN: Free softswitch for Windows by j_s on Thursday February 11, 2016 @05:29PM (#11083832)
Not sure what the status is now, but the https://sipsorcery.codeplex.com/ project ("C# SIP protocol stack") withered after they implemented their admin UI in Silverlight.

After a bit of digging all the pieces required for self-hosting appear to still be there.

Re:Show HN: Free softswitch for Windows by fenesiistvan on Monday February 15, 2016 @03:38AM (#11102185)
This is more an API for programmers, while the Mizu compact is for endusers/administrators without to any specific knowledge.