Pay-per-call Internet ads to generate $1.4 bln in 2009

Pay-per-phone-call that delivers telephone calls instead of clicks to online advertisers is expected to generate $1.4 bln in revenues by 2009. That number, however, could be as high as $4 bln by 2009, depending on the average price per call and actual market penetration, which could range between 5% and 15%, The Kelsey Group said.