google voice number. When they call, do they get your GV voicemail after 25 seconds? If not, stop there and report back.
The changes to adjust Touchtone something-or-other should not affect your phone ringing. So you are suspecting you changed something else. Did you make router changes? That would seem to be the more likely cause of being able to call out but not call in.
Go to the OBiTalk Dashboard. To the right of the name that you gave
to your OBi, do you have a green icon under Status, which indicates
Online? Click on the name that you gave to your Obi. Under
Configure Voice Service Providers (SP) does it say Connected for service provider that you set up for Google Voice?
To test for router problems if you have a separate router, consider connecting the OBi directly to your modem without the router, as a test, if you can. Reboot the modem. Do your symptoms change?