Can you call FROM this extension?

What happens when you try to transfer? Try calling the extension in question from a display phone and watch the display. It may give you a clue as to what's wrong.

Is the hold button lit red? If so, press the hold button while the phone is idle and turn off Do Not Disturb.

If you can give us a lttle more info it would be helpful.

Sometimes the thoughts in my head get so bored, they go for a stroll through my mouth. This is rarely a good thing.