Does this seriously mean telemarketing?
"A significant and growing majority of the consumer engagement and sales driven by mobile advertising happens offline, such as through phone calls,"
Does the current CEO of Marchex seriously think that telemarketing will work? Honestly, a) Lots of people are on the Do Not Call list (they aren't planning to join the greasy greasy, degenrate scum of the earth ILLEGAL TELEMARKETERS I hope? Great way to get a huge fine.) b) Nobody else says they enjoy getting telemarketing calls either... maybe in the past they'd buy stuff anyway, but these days? Who buys stuff via a phone call any more? c) Last I heard (thankfully) the telemarketing market was in a rapid decline (probably due to these two factors among others.)
As for selling the domains... I think that's a good move. For GoDaddy, they provide plenty of online services so the domain goes with it. For Marchex, it'll be increasingly hard to get good money for just the domain (no value added services like GoDaddy has) when there are so many new TLDs.