Eh, I'm not usiing Gizmo5 on the tablet, just the native SIP client. I'm starting to think this won't work without installing Gizmo5...

EDIT: figured out the incoming call part. It's a PITA, but when a call comes in, you have to accept, then VERY QUICKLY click the SIP client menu bar and select Internet Call/DTMF Dialing. In my case I had to click 1 to answer.

^%%$$&^^#@!!!

I see the need for a dialpad button on the app's home screen...

/me scurries off to submit software request (done)