Droid Incredible, FroYo/2.2, 3CX Android 1.3.4, Tunnel in use, WiFi in office 100% solid WiFi connection, other WiFi dependent services on phone working fine. No problems with incoming or outgoing calls. LOCK WIFI ALWAYS. Registration Timeout 300, Keep Alive Interval 60. After almost exactly 30 minutes of inactivity, the PBX reports the Android unregistered. Despite this, the ball in the title bar is GREEN. Selecting this via pulldown results in the phone app appearing, Tunnell Connecting... then Registering... then it's registered again. Just the same as though you cold started the phone. Hmm... So on a hunch, I opened up the almighty System Panel app (**NOT A TASK KILLER** - I do not have a task killer!) and went through the two lists of tasks (active and inactive). To my surprise, 3CX was NOT IN EITHER LIST. In other words THE 3CX PHONE APP WAS NOT EVEN AN INACTIVE TASK. Apparently, after 30 minutes, the task is exiting and leaving the green ball on the taskbar and when you pull it down it says Account Active! Tapping it results in the app being STARTED, at which time it goes through the usual cold-start process of starting up the tunnel then registering thru the tunnel I searched and found several rambling threads on this, and none of the reporters seemed to be able to piece the evidence together coherently, so I thought I would report all of this in as clear and concise a way as I could. Bottom line: This makes the 3CX phone useless as I cannot receive incoming calls.