<bump> for an update that may be affecting others regarding incoming calls....
I've had problems getting incoming calls to the gizmo -- all of which I thought were related to the "wait 10 days..." philosophy everyone talks about. Outgoing calls worked fine from day 1.
Today is "day 11" -- so I called SR and told tech support the problems I was having. They seemed baffled with my symptoms of 1) outgoing calls work fine 2) incoming calls make my gizmo's phone ring, but sound appears to be dead when I pick-up.
I have my gizmo behind my router/firewall -- and it occured to me to try turning the firewall off -- even though I could clearly see incoming/outgoing traffic to/from the gizmo.
Upon turning the firewall off, incoming calls worked -- but I really didn't like that solution.
After some fiddling, it turns out that my SMC firewall was not blocking ports <exactly...>, but instead was detecting a DoS "attack" during incoming calls -- and shutting down the communication to sunrocket -- but not before telling my gizmo to "ring". The criteria it was meeting for a DoS was a setting for "Max incomplete tcp/udp sessions from same host" -- which by default for my router is the value 10.
I upped that value to 50, and my problem is solved!
A secondary solution would be to turn off SPI for udp -- but I strongly prefer the above DoS solution.
edit: This fixes the "call button" issue, too. Woot!
Side note/rant: The timing of all this is great. I just got my next bill from Qwest, and they are STILL billing me incorrectly -- which has gone on for 5 months now. Good riddance to Qwest.