[Freeswitch-users] IAD/ADIT interoperability with Freeswitch

I have a few hundred users on analog phones. We are currently using the CarrierAccess ADIT 600 (now Turin Networks after the acquisition). We have also used the AdTran IAD Total Access 924. The two products provide a VoIP interface for analog phones. You hook up the analog phone and the ADIT/IAD provides dial tone and access to a few features via the hook on the analog phone. I am wondering if anybody on this list has used such devices with Freeswitch, what their experience has been, and what kinds of gotchas I should watch out for.