Try this.. set up a one key dial to go to another routing table with it's own dial action table. in that table set unscreened trf to the access code for day mode and another one for night mode switching. Refer to it as an administrators menu. Call in press the digit for the admin routing table, then dial the digit for day or night mode. Keep in mind, if they are using automatic node switching, it will switch over at the pre-set time.