SIP phones make outgoing calls fine but incoming calls do not ring to them

[Dranon2]

So my cisco 504 phones ring out fine but incoming calls do not ring to them. ALSO my calls do not ring both of my obi's. AND it seems random.  Sometimes the phone rings on the one obi and not the other. They are both configured with the same GV numbers.   

ALSO I cannot seem to backup the obi expert configuration. I just keep getting error try later. I have tried for several days. "cannot retrieve configuration from device now. Please try later"