I was able to reach the echo test number a few moments ago so I think there is nothing amiss at
obitalk.com and your problem is just that. Yours alone.
Try this.
1. Disconnect power from the OBi.
2. Disconnect power from your router.
3. Wait 1 minute.
4. Reconnect power to the router.
5. Wait 3 minutes.
6. Reconnect power to the OBi.
7. Wait 1 minute.
8. Try the echo test.
9. If the echo test works, try a call via GV.
10. Report back here with the result of the echo test and if applicable the GV call.