looking for options to put sytem in nights during day if cust leaves early?

Here is a link to the Admin Guide:

https://support.3com.com/infodeli/tools/nbx/60/admin_nbx60.pdf

and also the installation manual:

https://www.comediacom.com/Collaterals/3Com/NBX_Phone_Manuals/NBXinstall.pdf

You can also try the 3 Com website at:

https://www.3com.com/services/

Dean