I have a GV number. When I use the Obi200. I am able to send and receive fax. But with the Obi202, I use one line for phone and the other line for fax, but fax is not working with the Obi202. Some people have the same problem as me. they reconfigure the Codec setting. Some of them got it fix and tried what they did in their post, I still can't get it fix.