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Skype is the name that immediately jumps to mind when thinking of VoIP (Voice over Internet Protocol) calls. This is mostly due to its longevity and its easy-to-use software client. With over 300 million users worldwide, it would be nearly impossible for an up-and-comer to get close. That’s what partnerships are for.

Jajah, the online telephone service, has just announced a partnership with Yahoo to bring its service to the over 90 million worldwide Yahoo Messenger users. All Phone-to-PC and PC-to-phone calls now made via Yahoo Messenger will be on behalf of Jajah, which promises high quality and low-costs to users in over 200 countries.

This partnership comes alongside news that Jajah has just signed up its 10 millionth customer on the eve of its 2nd birthday. This represents impressive growth considering that just last year, JaJah only had 2 million customers. The company hopes that other partners, along with Yahoo, will soon get on board with its new Jajah Managed Services for business.

Jajah often gets confused with the other “J” online calling services, Jaxtr and Jangl. Jangl and Jajah actually formed a partnership back in November.

Jajah, is backed by Sequoia Capital, and raised $20 million in a third round led by Intel Capital last year.

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