AT&T's Cingular Wireless said it will demonstrate at next week's Consumer Electronics Show a video sharing service that lets callers send live video streams during a standard voice call.

A caller simply hits a button to activate a live video stream; the caller at the other end can switch the direction of the video stream during the same phone call.

As an example, Cingular said a couple in San Antonio with a new baby could hit the button to send a video stream to grandparents in Miami.

"The parents receive an invitation asking if they want to view the live video stream, and once accepted, they begin seeing the video shot by the kids in San Antonio," a Cingular spokesman explained. "The speakerphone turns on and the proud new grandparents in Miami can see a live video of their granddaughter taking her first steps or saying her first words."

Cingular added that the service demonstrated at CES isn't currently available, but is likely to be formally unveiled by summer.