While lack of product (and network, in most places) is the US' biggest roadblock to acceptance of video calling, the technology hasn't exactly captured the hearts and minds of consumers where it's been rolled out, either. There are a few believable theories why it hasn't taken hold: size of the screen, quality of the video, cost, the fact that you're making the call in your skivvies, et cetera. Radvision thinks it might have a lot to do with the fact that PCs are already well-established in the video conferencing game and they've been unable to play nice with 3G handsets thus far, prompting the company to develop "PC-to-Mobile," a PC client enabling video calls to handsets and vice versa. The solution appears to require carrier acceptance and implementation, meaning that unless your operator of choice decides to sign on Radvision's dotted line, you might not be able to get on the action -- but given that video calling likely hasn't made anyone a dime yet, these guys might make quite a splash.
[Via The Inquirer]