Free SIP Server for Windows.
I was searching for free SIP servers and the first I found was a server from 3CX. 3CX provides telephony services and products globaly, in the UK, USA, Germany, Cyprus, Malta, Australia and Hong Kong.
The Free edition of the SIP server from 3CX has an impressive feature set;
Blind Call Transfer
Attended Call Transfer
Call Forward on Busy
Call Forward on No Answer
Call Routing (DID)
Auto Attendant / Digital Receptionist
Music on Hold
And if you need more you can upgrade yourself to the enterprise version with even more extensive list of features at a very resonable cost.
But our interest is in the free edition of 3CX SIP Server. It can share the existing network infrastructure, big or small and can be installed on an existing, non-dedicated Windows server or run as a virtual machine. So if you are a windows shop and was reluctant to touch Linux server to get cost effective telephony services, this might be the first step to say goodbye to expensive, proprietary phone systems and costly phone bills!
There are tons more features that the system carries but the limits of this post does not allow me to list all of them here. So without sounding like a paid post, I will let you visit the site and decide for yourself.
3CX SIP Server for Windows could be down loaded from 3CX Server.