HotDesk - Call History

Hi
T46G IP Phone

I've added a HotDesk DSS button and when clicked the user gets 'Clear all account config ?'

They click OK and are presented with Hot Desking, User Name and Password fields.

The next user logs in fine, but they see the previous users call history.
Is there anyway to clear this so users aren't sharing call history ?

Or disable call history all together ?

Thanks