Google To Offer Google Voice VoIP In Gmail?

This is still a rumor at this point, but word is that Google is testing integration of Google Voice into Gmail’s chat program, allowing users to make phone calls directly from their PC using the Google Voice service. This would obviously involve VoIP technology, allowing users to start a voice call from their computers and have it connect to a regular phone line, similar to Skype. If the rumor is accurate, this service will be launched via a phone icon inside the Gmail chat window, launching a number pad, allowing users to find contacts, check their credit balance and place a call. Do you think Google will charge for this service if the search engine giant does roll it out?