I have a bogen amp in an office with an f9600 remote shelf. The remote shelf has 3 digital line cards and one slt card.
No room for a CO trunk card.
I have done this before but for some reason I cant get this to work. I suspect the headset amp isnt putting out the 600 OHM's. It is a plantronics M12 on a digital phone set to autoanswer.