Mobile operator Cingular Wireless said that it will demonstrate a new service that allows wireless phone users to stream live video during the course of a call.

Beginning with a normal phone call, customers can hit one button to add a live video stream, the firm said, allowing the called party to see what the caller is seeing while they're talking. The stream works in one direction, which can be switched during the call.

The new service runs on Cingular's 3G network, which recently deployed an

Internet Protocol Multimedia Subsystem (IMS) platform that enables the video stream, as well as other features.

Consumers can get a real feel for what 3G wireless can do and what to expect in the future said Kris Rinne, senior vice president of architecture and planning for AT&T.

Demonstrations will be made at this year’s Consumer Electronics Show in Las Vegas next week, using Alcatel/Lucent's 3G network and phones developed by LG Electronics.

Cingular, the largest wireless carrier in the United States, expects to make the video service commercially available in 2007.