I have not tried this with 4.1 software yet but you used to be able to create a partition and calling search space specific to the one phone/DN that you want to autodial. Then configure a translation pattern with a blank pattern and a outdialing prefix of the digits you want dialed causing the phone to match the blank patttern when offhook. Since it matches the translation pattern when offhook it will dial the digits in the outdialing prefix of the translation pattern.
This translation pattern should be placed in the only partition that the newly created calling search space is allowed to call. Do not add any other devices to the same partition.
