Today I tried to figure out how I could integrate Phone Fusion and Google Voice to send me visual voice mail when someone leaves a message on my phone... That way I wouldn't have get into my Google Voice account to download the mp3 and well you get my point...
So I was configuring the Phone Fusion number as a Phone on my account and I get this popup
"+18122000200 : This number is already in use as a cell phone on another Google Voice account"