Marchex purchased VoiceStar for $20 million along with $8 million in additional investments through 2008. The acquisition is on track to be completed by October 1, 2007. VoiceStar will still operate from its headquarters in Philadelphia, PA.

"With the addition of VoiceStar, Marchex offers one of the most comprehensive online advertising platforms and agency services for local advertisers at scale in the industry. We can now offer local aggregators a private label search- and call-based marketing platform with distribution for their advertisements in search engines, vertical Web sites, and on our network of local Web sites," said Peter Christothoulou, Marchex Chief Strategy Officer.

 "Additionally, we can now also add proprietary pay-per-phone-call advertising units to our network of local Web sites, which allows us to increase the direct monetization of our own properties."

The VoiceStar purchase adds 100 local advertiser aggregators, including Comcast, The Cobalt Group and YellowBook USA to Marchex’s partners which already includes AT&T and Yellowpages.com.