Transfer call code *28

Hi.
Sorry, I’m a new user…
In my office we want to trasfer calls to a cell number if the office is closed…but…now we activate the day/night mode and the trasfer works properly but to the code *280 (and the destination is a cell number)…so if we digit this code everything works but now we want to “select” the destination (eg. *281, *282…)
We have added the destinations (and cell numbers) but the code doesn’t work (or better) it switchs the day/night on/off but only for the code *28x…How can we solve this problem?
Thank you in advance. Riccardo.