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Some pay per call agencies and firms
Ingenio http://paypercall.ingenio.com/default.as...
Superpages.com http://advertising.superpages.com/spweb/...
eStara http://www.estara.com/
Voicestar http://www.voicestar.com/
Google (limited testing) http://www.google.com/help/faq_clicktoca...
FlyingSpider.com http://flyingspider.com/
Thinking Voice http://www.thinkingvoice.com/
Upaypercall http://upaypercall.com/
ZiffLeads http://ziffleads.com/
I think Google.. Now only they introduced but it is really good
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