@Sarah,
Though I'm not currently in Canada, and so can't test the theory, have you tried using a CallCentric or (if you can find one GV will accept, IPKall or IPComms) as your edge's phone number? When I set up CSipSimple, I was asked to input the device's phone number. I assigned one of my free numbers to my PE. When I signed up for the free account I was given something like 5 minutes of credit for testing purposes. This can be used to 'verify' the phone number for GV. If you use a US number, it might work, especially if you route it via pbxes . . . just a thought.
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