Seeing a parked call, on a button, and picking up the call

I have some grandstream GXP-2000 phones, they work great for everything I have done so far. I would like to park a call and see the parked call on a button, then press that button and pick the call up? I have set the buttons as Asterisk BLF’s for 701 and 702, I can park the calls(I do not hear where they are parked though) but no lights come on, I can press the button for park1 and pick the call up? I must be missing something but havent found anything to help?