System running fine for weeks. Windows updates come in that require a reboot... Incoming calls get a fast busy, as if there is a programming error. A restore seems to fix the issue, but I am thinking that it is just a service restart that is correcting the issue. . Outbound seems to work fine... Does anyone think this is the case? If so, would it be just one service? . I am thinking that bouncing "3CXSystemService01", aka "3CX PhoneSystem 01 System Server", fixes this. . I set this to be a delayed start, and will need to test the system for future updates. With Windows, that will most likely be this week! I did run across this 2 year old thread that led me to think I am on the correct path... https://www.3cx.com/community/threads/no-incoming-calls-after-power-failure.41323/ I appreciate any helpful feedback.