Setup a Canadian 403 phone number and forward it to whatever number you want, seems Google Voice will forward to that one Canadian area code(403).
Get a free 403 number at freephoneline.ca then setup to forward it to your number for free...
403 area code(Calgary Alberta) number and then have Google Voice use that number.
Google Voice number == 403 freephoneline.ca number ==your Canada phone number...
Google Voice use that number
* Update: Google Voice had some kind of loophole that allowed forwarding to Canadian 403 area code numbers. It seems a serivce does exist that allow you to sign up for a free 403 number and forward it to any Canadian number. This service is FreePhoneLine.ca Using that service I selected a 403 area code(Calgary Alberta) number and just set it up to always forward to my cell number or home number.
Now my US Google Voice number rings my Canadian cell number or home number.