I would like to develop an own application. I have experience with C and C++. After looking for guides on the Internet I found a site (http://www.voip-sip-sdk.com/) that has several sample programs. The sample programs are developed in C# and VB.NET with a software called Ozeki VoIP SIP SDK. I have never worked with this programming language previously so I do not know how to start. Could you please provide me a solution how to start using this software or the sample programs? I am really interested in your opinion. Thanks for your time and suggestions.