Unable to use VoIP thru Cox using Google Voice and an OBi!00

Before I start, I just want to say I know the GV vehicle is going away May 15th of this year.  But, before I invest time and money in an alternate, i.e. Callcentric, I want to make sure Cox will allow VoIP.  So, here goes.  I have successfully set up my OBi100 through Obitalk.  I have successfully set up my Google Voice with a new number that indicates it is connected to my OBi100.  My GV calls are forwarded to Google Chat.  I have successfully made a call to the World Time number from Google Chat's call feature.  My Obi100 is connected directly to a Netgear Router, and at the suggestion of a Google VoIP specialist, I disabled SIP ALG on it.  Here are the symptoms; any outgoing call results in a woman's voice saying "we're sorry, your call was unable to be connected, please try again."  Any incoming call rings seven times and goes directly to GV voicemail.  I am using Cox Premier service.  Any ideas or suggestions?