Lately I have had a problem when I pick up a phone I get a message "Device Not Registered" instead of a dialtone. Support says unplug, reboot. I have done that several times and still have a problem. Any suggestions?

My configuration is a Comcast "modem" to the ATA (the non-Linksys model supplied by Voipo), then a wireless router. My bandwidth is usually 12mb down and 4mb up.

Thanks