Calls drop after ~ 3 minutes (but not all) - have had this problem since day one with the OBI.
The Obi unit is up to the latest OS upgrade - it's connected to an Apple Airport Extreme - tried Google Voice and Sipgate..... both show the same problem.
(also - Google Voice seems to always have call screening on.... but it's turned off in the GV setting).
I was using a Cisco PAP2T with Sipgate and didn't have the dropped call problems....
Any thoughts?