snsumner,
I believe that you have mixed up some of terms use in OBi device.
For OBi100
PHONE Port : RJ11 port is supposed to connect a corded or corless phone
For OBi110
PHONE Port : RJ11 port is supposed to connect a corded or corless phone
LINE Port : RJ11 port is supposed to connect the teleco PSTN
For your OBi100 case, the RJ11 port is a PHONE port which will give voltage/current to an ordinary corded or cordless phone. You MUST NOT connect the teleco PSTN line to this port because Teleco PSTN line gives voltage/current and the PHONE port of Obi1xx will give voltage/current. If you do it, your OBi100's PHONE port will be burnt out!!!!!
For how to configure the wiring in your case, you might take a look at the information provided MT.
YH