We have a Mitel SX-200 ICP VoIP PBX that is essentially stuck in night mode. We believe the only thing that happened was that settings to the "primary" superset that inbound calls are directed to, got changed. In our system, this is extension 120. The settings that may have been changed are the TEN and EXTN. We have changed the EXTN back to 120.
The issue may be as simple as reconfiguring night mode, but we really don't know how to do that.
I am including a couple of screenshots that will hopefully help.
This project consists of simply helping get the phone system configured back to properly route inbound calls with day/night mode.
Please see attached screenshots for reference.