1. I suspect that your house wiring is not properly disconnected from the outside world and something eg on a telco line has changed. Just because a phone line pair is not in service does not guarantee that it will not be exposed to local office battery or ringing voltage. I'm in the UK so am not familiar with USA wiring practices and cannot advise further on specifics of demarc points.
http://www.obitalk.com/forum/index.php?topic=12735.msg81796#msg81796 may be helpful. Not having the house wiring disconnected risks damaging OBi PHONE ports.
If you are certain that the house wiring is not connected to the external world, unplug all the phones throughout the house and look again for around 50 volts against the phone ports on the GUI page. If it is there, plug in one phone at time and check each time. You may have a faulty mains powered phone/base. If no volts when all phones unplugged but only house wiring plugged in to the OBi then you have a wiring fault.
2. The red exclamation marks mean that the values of those parameters are changed from the defaults, probably by configuration on the Obitalk portal. You can see if that is the case by entering Expert mode on the portal and navigating to those settings. Are the tick boxes in the 'Obitalk Settings' column empty?
3. As an aside you may not be aware that the PHONE1 jack on a 202 is actually wired internally for PHONE1 and PHONE2. The two centre pins (3,4) are PHONE1 and pins 2,5 are PHONE2. Those 2,5 are hard wired across to 3,4 of the PHONE 2 jack. Mainly intended to plug a 2-line phone directly into a 202 using a single phone cord.