ParkedCall() — Answers a parked call
Connects the caller to the parked call in the parking
space identified by parkingslot. This
application is always registered internally and does not need to be
explicitly added in to the dialplan, although you should include the
parkedcalls context.
; pick up the call parked in parking space 701
exten => 123,1,Answer()
exten => 123,2,ParkedCall(701)