Call Parking

I seem to be at a loss with call parking. I have a very basic setup using the defaults for an Asterisk 11 Installation with just 2 extensions configured and when I park a call the MOH plays fine, after it times out, it tries calling back the person who put the call into the parking lot, then after a timeout of 30 seconds, it just drops the call. How do I get call parking to send the call back to the parking lot if the person who placed it there doesn’t pick up?

Thanks for your help!

You might be able to do it with an explicit invocation of ParkandAnnounce, but I’ve only done custom park timeout handling from AMI initiated parking.