[Freeswitch-users] parking scenario

I want to make a parking system slightly different than what comes in the box. The intended sequence would be- 1. User presses programmed button on phone 2. Call is transferred to 1st available park lot/orbit 3. User hears lot/orbit announced 4. User hangs up headset 5. 2nd user picks up call at announced extension Inevitable questions - In step 2, how would I go about accessing the park orbits in js to determine what the state of each is? I want no more than 1 call per lot, so I don't need mod_fifo, unless it's easier to use from js.