FOP drops calls on the thrid transfer

[Grant Scheffert <grant@xxxxxxxxxxxxx>]

I submitted this to the Trac area, but thought maybe it would be more 
appropriate here.

I have used/tested 2 versions of TrixBox (which includes FOP), my production 
version of 2.2.10 and most on trixbox CE 2.6.0.7-vmware which I downloaded.  
I've had a problem with FOP dropping calls and here's how I can make it happen 
consistently:
 1. I make a call to an extension and answer it, either from a trunk or just 
another extension.
 2. Using FOP, I drag the call to another extension and answer it there.
 3. Using FOP again, I drag the call to another extension and answer it there.
 4. Using FOP a third time, I drag the call to another extension, and this time 
the call is dropped.

I have reverse_transfer enabled, but it happens either way, it always drops it 
on the third transfer. I can transfer calls with the phones as much as I want, 
but if I do 3 in a row with FOP, the call is dropped.

I asked about this in the TrixBox forums and was told "This is a known Asterisk 
problem where the call state gets totally confused and has to drop the call."  
I want to dig further into it, but was looking for some direction of even where 
to look.

Ideas?

Thanks,
Grant Scheffert

If all the human potential that's being directed towards creating and fighting 
spam went to science instead, we'd have a cure for cancer.