Finding a suitable PBX for Windows is not so easy. Most of the free versions are actually free only with a few users. The exception was FreeSWITCH which is open source and runs on windows, however it is not so easy to use for the average users (no GUI, regexp rules for routing).
With the Compact Softswitch project our intention is to fill this gap on Windows by a solution which is both free and easy to use.
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.
For linux we already have a lot. Also for Asterisk there are a lot of user interfaces written.
For windows there is are no other free softswitch with easy to use GUI.
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[ 3.7 ms ] story [ 26.7 ms ] threadWith the Compact Softswitch project our intention is to fill this gap on Windows by a solution which is both free and easy to use.
After a bit of digging all the pieces required for self-hosting appear to still be there.