Search marketing firm iProspect has introduced a tool that lets its customers track pay-per-call conversions from keyword and paid search campaigns, reports DM News. SearchTalk will help marketers track inbound phone calls generated by pay-per-click ad campaigns. The service, provided through Who's Calling's ClickPath phone solutions, lets marketers assess the keywords, search engines, landing pages and ad creatives that are most effective at driving inbound phone calls.