Partner 18 is just the model of the phone itself, not the system. I am sure that for a small fee, one of our Avaya moderators will be able to help you identify the system that you have and how to set this up.

You also have the option of delayed ringing if the day/night service seems to be a chore. Activating night service is a simple push of a button though to turn it on/off, so I still think that might be your best solution. You can also combine both features to ensure that all of your bases are covered.

Ed Vaughn, MBSWWYPBX