asterisk users - Mar 2008 - AEL2 Hint & Parking

I've been reading most of the day and can't seem to find a clear 
definition of the syntax for parking lot hints in AEL2.  I have tried 
all of the following and they either do not light up the line button on 
my Snom 300 or give syntax errors:

hint(park/701) 701 => {
    ParkedCall(701);
  }

hint(park:701) 701 => {
    ParkedCall(701);
  }

hint(park/701 at parkedcalls) 701 => {
    ParkedCall(701);
  }

hint(park:701 at parkedcalls) 701 => {
    ParkedCall(701);
  }


I have this in my context as well:

includes {
    parkedcalls;
  }

I do not see any indication on the CLI that Asterisk is attempting to 
notify my sip phone of the status change and I have verbose and debug at 20.

Any ideas?