I need some help in finding  a way to execute some dialplan code after the parked user Hangups from the parking lot. 

I've a scenario where Parked party decides to hangup while listening to MOH while parked. The Dialplan just Hangsup right away and I have no control.

I've tried using: session_in_hangup_hook, and api_hangup_hook=myscript.lua but they get executed for the parker just after they hear the Parked slot number. 

Then I've tried nolocal:export these two variables for the other leg but nothing happens.

Kindly suggest what other option are there.

Best Regards.

Sammy