QuickCall: How to setup Google Voice Account
Currently QuickCall only supports using google voice to place international calls if you enable Direct Access to voice mail with PIN required.
Important:When you use QuickCall to place a call using Google Voice you will be charged by your phone service provider for the call to your google voice number and by google for the call to the contact's phone number you selected on QuickCall
Please note that QuickCall you only try to place a call using google voice when the contact phone number is in full international format (e.g. #12123334444) and the country code is different than the one you entered as "your phone number"on the quickcall settings window. Otherwise it will just place the call using your phone carrier
On Google Voice (http://www.google.com/voice)