Night Mode is used to change the ringing destination of trunks, not phones... How it is programmed varies based on your type of trunks (analog or PRI/SIP). Analog trunks, you just set a different destination in trunk group, for PRI/SIP DID's you have a second CRT that is used for Night Mode (Ie. 1 for day and 2 for night) and you only put the ones that are different in 2, and as the last entry you point it back to 1.