Toronto-based DCCI has partnered with Ingenio to give online publishers the option to offer local phone numbers to advertisers seeking to adopt Pay per Call. Right now, the option is targeted pretty much exclusively to IYP publishers in North America.
It will be interesting to see how much demand exists for a local number version (as opposed to toll-free number option) at the advertiser level. There are pluses and minues to each approach. Ingenio is seeking to meet a demand in one of its key potential markets — IYP.
Here's one example of FindWhat's Pay per Call (Ingenio) implementation on BizJournals (scroll, lower right).
More extensive/comprehensive writing on Pay per Call coming very soon.