I have 3 2008HF/with display phones at a site that will display date and time but will not display the name or extension number of the person calling these phones. I have limited knowledge and resources but have tried adding DNDA to CLS in LD 20. This does not help. Do I need to do something else before I make the change in CLS? Is this done in LD 20? These are the only 3 phones with displays so I have nothing to compare with. Any help would be appreciated.