Managed .NET library for interacting with the Microsoft Telephony API (TAPI) 2.x. This library is for creating clients that consume telephony services on Windows XP or better. To use this library, it's helpful to have knowledge of TAPI as it's really just a thin wrapper over the Telephony API provided by Microsoft, there's a documentation file included in the form of a compiled help file for Windows.
The best way to install this into your project is through NuGet.
Or right-click on the references folder in Visual Studio and select Manage Nuget Packages and type ATAPI into the search box.
This project has been around a long time on http://www.julmar.com in binary form, and I finally decided to release the full source to the project. It's very mature and stable.
For a simple example, check out http://www.julmar.com/blog/programming/atapi-for-net-2-0/. For more examples, download the source tree which has several test applications.