If it is your cell phone, save them in your contacts and set the ring for them to "no ring". TThat way they never disturb you. I have 5 numbers for them all saved under the same contact as mobile 1, mobile 2, home, work, and one under fax. Also, if you put a Z in front of their name your contact list is not cluttered up that you have to scroll through. They are out of the way at the end.