Hi, I wonder if someone could help me. We had a two year old in the office last week who went on a button pressing spree and somehow our phones no longer work. Whenever we try to select an outside line it says they are busy and when the office is called from outside, you get an engaged tone. We have tried turning them off and on again. Any help would be greatly appreciated. Even if we could reset.
Page 99 in the User Manual. try a warm reset first and if it still doesn't work do a cold reset. You will then have to re-programme the system for call handling etc.
You may try to do a reset on everything just for your unit to have a fresh start. That worked for me.