Help in programming

Hello Everyone,

I am a computer engineer student who is also learning C lately. I want to start developing an own application. While I was doing a research on the Internet found a site (Ozeki C# VoIP SDK - A SIP SDK for software developers) that has lots of sample programs. As I have seen the sample programs they are built with a software called Ozeki VoIP SIP SDK in C# and VB.NET. Could you help me how to start using it or any of the samples? Could you recommend any books or tutorials? Maybe should I try Visual Studio or request a user manual? Please let me know what you think and suggest. Thank you.

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