Hello Forum, I'm developing a Winform for testing purposes, have difficulties to check the status, or to use the dropcall, because the CallID is needed for this. Now my question is, how do I get the CallID for hanging up? How to initialize it? As an example the 3CX is used: https://www.3cx.com/blog/docs/3cxphone-for-windows-api/ Problem is that 3CX doesn't support development! It would be nice to have an example with a working Winform.