Thank you for the reply. I saw the "placeholder" page previously, but all that does it tell you how to download 3CX phone. I cannot see any information for replacing the functionality of web based access that MyPhone had, per my original post.
Our organization has several remote locations, that are connected to the main office via VPN tunnels. By using the MyPhone web based functionality, I could access a remote user's MyPhone and change presence status, etc. An obviously useful thing to be able to do! But no apparently it is no longer available, and there is no equivalent replacement for doing this in v12 of 3CX?