In our shop OXO pressing the flashing message key or dialing 500 (voicemail hunt group) results in a busy with the message Not at moment. Tried a warm restart, the system never recovered. Powered off/on, system is back up but voicemail is still inaccessible. Would the Power CPU have to be replaced?

The Auto Attendant greeting can be played from an operator phone.

I believe this is because the temporary license expired.