I have a user who is trying to manually program autodial buttons on his 6416 set. He chooses the program button that is setup in his softkeys, and gets prompted to choose the button to program. A button is selected and when he goes to enter the number to autodial, he gets a wave off tone. I can do this same procedure on my 8410D+ set and it works just fine. Is there a setting that I need to change to allow him to make these changes?