At SearchForecast, we make hundreds of phone calls each week for our adnetwork clients. After qualifying their websites from within the AdSense Directory, our internal sales team call the publishers.
Insight #1: Publishers are very polite, require little information to determine whether they are interested in learning more.
Insight #2: Publishers want to earn more money and are not contacted by large adnetworks by telephone. Give up the online marketing techniques and call them!