Call Parking Lot: Calls drop on pickup

I’ve setup the parking lot feature and everything seems to work. I assigned the extension 700 to the parking lot and have 4 lines available. When transferring the call, the caller gets the hold music and I hear the parking lot extension number. When I pickup from another phone, it immediately disconnects the call.

Any ideas why that might happen?

System Info:
Your Linux Distribution: (Redhat CentOS release 5.7 (Final))
Your FreePBX version: (2.10.1)
PBX Firmware: 1.812.210.57-1
PBX Service Pack:

Can you confirm that this install was a Distro and not built by hand.

Also some logs of the call dropping would be helpful.