wvoc,
My OBi110 continues to work flawlessly but I switched our primary home phone service to an OBi202 with an attached 2-Line phone nearly 4 years ago.
Currently, I use the OBi110 to integrate an AT&T Wireless Home phone into our home phone system as a "Backup" that will continue to work during the rare times that we have an extended internet outage. When the OBi110 eventually stops working (of circuity old age or outdated firmware) I will add the optional OBiLINE USB dongle.
Using the OBi110 with AT&T WHP service is actually an exercise in unneeded caution as extended internet outages have become extremely rare and we have mobile phones. At the same time, the OBi110/AT&T WHP project was a great way to learn more about using OBi devices as I learned from post and examples from our very knowledgeable ObiTALK forum "Hero Members".