I am having the issues with TAPI and my search shows that all users face the same.

It seems the windows 10 TAPI fails to initialize! I can not believe how Microsoft could release like that and not fix it yet.

Here is how to reproduce it - download sample code from here. And run the program and see tapi.Initialize() fails to return (forever loop).

Windows 8 TAPI 3 in C# - Get Lines and make a call, see calls incomming sample in C# for Visual Studio 2010

Would appreciate a response from anyone if they have a work around. I need to for a high priority customer issue. Thanks!