Develop IVR System in Dotnet

Hi

I want to develop IVR System  for my company application. Actually I just need to Receive the calls and the IVR system have to give the repose accroding to customer choice and send SMS to customer.
I have idea about SMS but don't about IVR IVR system with ASP.NET .
My Query is that
1. Which type of  hardware and software we need?
2. Can we implement IVR in our company or we need to tie-up with other service provider?
2. Any 3-part components require for this ?
3. From where can I get an exact idea on IVR system development in .NET !!

Thanks in advance


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