UPDATE: Aug 2013Dell Voice no longer exists; and Fongo no longer sells the VoIP Unlock Key. Previous holders of the Fongo Unlock Key must now register their ATA's with FreePhoneLine.ca servers.
I have written a new article explaining how to configure the Cisco SPA112 with FreePhoneLine.ca. The FreePhoneLine.ca configuration settings will work the same for previous holders of the Fongo Unlock Key as it does for FreePhoneLine.ca account holders. The settings explained for the SPA112 will also apply to the PAP2T.