Yahoo! launches pay-per-call service : http://www.netimperative.com/2005/08/10/Yahoo_pay_per_call
Pay-Per-Call is billed as an alternative to traditional pay-per-click search advertising. .. The advertiser is only required to pay for the adverts that result in phone calls, in much the same way pay-per-click advertising only charges for visitors sent to a website. .. Users who have selected the retailer and offer, which best fits their needs, will be able to contact the advertiser directly by phone to make a purchase... The pay-per-call option will facilitate the development of personal customer communications and bespoke customer services through the internet.