Calling Party Name is controlled by the receiving party, not the sending party. The public network is not setup to traverse the name from end-to-end like the calling number.

So why is Calling Party Name supported? One reason is so you can put the 5000\Axxess systems behind a large PBX connected via ISDN. In that environment, I would be able to call you from PBX to PBX and you would see who is calling, number and name.