My research with Zachary lead me to this.

"Google is reportedly testing a new voice calling service that would reside in Gmail on the desktop. Tom Krazit at CNET says the service is launched from the Google Chat window within Gmail, and allows users to place and receive calls from within their contacts. "Google has been edging in this direction for some time," he writes. "Google Talk was released years ago as a VoIP (voice over Internet ..."