Yes, I signed up for it today, after receiving a note from Google. As part of the process of setting it up, it will log out of all computers and devices that are using your Google Voice account. This temporarily kills the Google Voice connection on OBi devices.
All you need to do after enrolling in Advanced Protection is to go to your OBiTALK dashboard, look at the list of SPs for your OBi, and you'll see that the Google Voice SP has failed with an authentication error. Click the SP, then on the SP page, click the link to re-authorize your OBi device. If you have multiple OBi devices, you will need to do this for each device. This a one-time re-authorization (it does not impact ongoing use of the device).
Note: if you are using Obihai's Google contacts import function (either via the optional OBiEXTRAs program or on an OBi IP phone), this will kill the ability to import contacts. You can restore this function by clicking the button to import your contacts again, and then re-authorizing it.
See the screenshot attached.