Here's my setup:
Freephoneline.ca (with SIP unlock key)
DIR-855L router
Obi202 behind the router (Obi is in the router's DMZ, ports are forwarded).
Phone plugged into Phone1 port (tried two different phones, same problem).
The last couple of days, whenever I get an incoming call, the phone just won't ring. The call does show up in the Obi's call history. If I pick up the phone, the connection works fine. All that is missing is the actual ring.
Is there anything I can check?
In case your phone doesn't respond to the default settings, I would try changing some Phone1 Port Ringer settings. Using some test calls to your number, I would try changing the RingWaveform from the default Sinusoidal to Trapezoidal, and if still not working try raising the RingVoltage from the default 70v to the maximum 82v.
Well, it's working now, but it seems what actually fixed it is rebooting the obi: I've reset the values to what they were before, and it's working as well. Thanks for the help.