Deviceanduser mode troubleshooting

Working on setting up the AMPEXTENSIONS=deviceanduser config on Freepbx2.2.1 (as installed w/trixbox 2.2). I’ve got the devices and users config’d in the gui, done the apply changes and all that, but it doesn’t work (inbound or out). I’ve noticed that sip show peers at the cmd line only shows 1 peer, the sip trunk, and I’ve also noted that on all my other asty boxen (freepbx or not) this will show all sip exts, active or inactive. Should I be expecting the same behavior under the deviceanduser config?

I’m more than happy to accept an answer in the form of verbose documentation, of which I have yet to find any…