Offering consumers a free calling plan on their computer or on their house phone is no way to make money, as exhibited by the likes of Skype, Jajah, and others. Heck charging for minutes delivered by VoIP is a tough business proposition when your primary target is end-consumers. But Jajah’s recent deal with Yahoo is about combining their relative strengths so that both can use VoIP to produce something of value.

Yahoo is good at content federation and advertising, while Jajah is good at switching VoIP packets. The result? Both have a better shot at actually turning a profit.