Hello,
I would like to share one of my latest experiences related to .NET and VoIP. Recently I have read about
a sample software which was written in C# .Net. It is an IVR software with DTMF function. That means it
enables the caller, to make selection from a voice menu. The caller can select a menu point by pressing
the keys of the telephone. You can find the source code of this sample software too and you can customize it according to your needs.
If you are interested in, you can read about this solution here:
http://voip-sip-sdk.com/p_117-how-to-use-the-c-sip-softphone-source-implementation-of-ozeki-voip-sdk-for-dtmf-ivr-voip.html