I purchased an Obi202 from Amazon and configured it for Google voice. I have a corded phone connected to it. Periodically when I pick up the receiver I can hear a buzzing on the line. I can swap out corded phones and the buzzing is still there. I can connect to port 1 or 2 and the buzzing is still there. If I power cycle the device the buzzing goes away. This is the second time I have noticed this in the last 6 weeks. I want to cancel my landline, but at this point I'm not comfortable with the stability of the device.
Any thoughts on what is causing the buzzing?