It can be modified (if you didn`t buy it pre-modded originally), but there is no "built in" handset hack for any panasonic model. Your only option is to have it modded either via a specalist dealer, or via a service remote that you can buy / rent on the net. Thats why its always best (and cheapest!) to buy a machine pre-modded via a specialist dealer
A quick google search, or the baner at the bottom of these forums will help with the information needed.