I have set up 3 obi devices in 3 homes:
1. My home (US)
2. My parents (India)
3. My in-laws (India)
We usually use obi to obi calls. As of the last few days, 2 and 3 can call 1, but we (1) cannot call India.
I am presuming the problem is with my device. So far, restarted my device, but it did not help. I have not done much with the device, so pretty much a newbie.