Microsoft announced the Calls feature at a Samsung event August. This feature will be available for all devices running Android 7 or a newer Google operating system. Part of the "Your Phone" application, "Calling" started to be released today for Windows Insiders.
So if you have an Android phone, the Calls feature will allow you to answer phone calls, but also to make phone calls from your computer. You will be able to access the call history through the "Your Phone" application and seamlessly switch calls between your computer and your phone.
You will still be able to reject a call from your computer or send a custom text message in response.
All you need is an Android phone running Android 7.0 or a newer Google operating system and a Windows 10 Bluetooth PC (without any specific Bluetooth version).
Finally, Microsoft said that this feature will only work if you are running Windows 10 19H1 with an 18362.356 operating system installation number or a later version.
Currently only available for Windows Insiders using the Windows 10 19H2 updates. This version will probably be released as "stable" for everyone sometime in October.
This feature was announced in one Publication on the company blog on build 18999 for the upcoming 20 update of 1H10, expected to be released sometime in April at 2020.