This actually sounds pretty cool........
http://blog.searchenginewatch.com/blog/051024-134309
InfoSpace Announces New Pay-Per-Call Solution
Technology provider Jambo will create a unique, trackable local phone number for each listing on the Infospace site. Calls made through this number will be tracked through Jambo's servers, and delivered to the merchant with a branded message appended to the beginning to the call, letting the merchant know the lead came from Infospace...Once a merchant begins getting calls, Jambo will follow up, either with a human sales person or via an automated phone call inviting them to sign up with Jambo for enhanced services. Merchants can pay a per-call fee to get higher placement in search results on Infospace, as well as on other directories, local and vertical search engines in Jambo's network. Jambo customers also get detailed demographic and geographic information about each caller.