I've an issue that boggles me and whatever I try I just can't seem to get going.

Our outside sales reps all have Blackberry, and their land line extensions all are set to call forward on their Blackberry on Busy or No answer.
All exept for this ONE extension.

No matter what I try, it's just not working.
I started off by assigning his DND on the phone (through CTX), then asked the user to #6041 > %phone number% > #. No go, fast busy signal.

I set his DND button as CF-All through CTX, fast busy signal.

I compared all the settings of his extension to another one that works, everything is the same.

I'm really puzzled on this one now. Anyone got an idea?

Phone: DKT-3220-R
CTX: Strata-CIX 100

If any more details are needed, let me know.