We are running Unity Connection Ver 8.0.1.
UCCM Ver 7.15
Recently we noticed some but not all newly installed phones come up with the MWI "On" but, they DN was not assigned a Unity account.
I discovered with initial troubleshooting that the MWI DNs we typically dial to turn on & off the MWIs on the phones is not working, we get the recorded message "your call cannot be completed as dialed" from the system.
The MWI on/off feature is working normal for all phones with valid Unity Connection accounts.
Any assistance is greatly appreciated.