my building is having the power turned off tomorrow for some repair work.

I have a strata dk 280 system (2 cabinets) and a telekol 3.91 voice mail system. I am backing up the voice mail setting now. Can I just switch it off or is their a power down command?

Can I just switch off the strata dk280? does it matter in which order I turn off the boxes?

For the 280, power off the main cabinet and it will also power down the expansion cabinet. I'm not sure of the Telekol though.
And just to be safe, I would leave the power cord unplugged from the power outlet while they're doing work.