JAJAH has been selected by Yahoo! as the outsource partner for its premium voice service. The “Phone In” and “Phone Out” service will enable consumers to make low-cost PC-to-phone and phone-to-PC voice calls over the JAJAH network using Yahoo! Messenger.

The partnership leverages JAJAH’s open, next-generation communications platform to support the existing Yahoo! Messenger voice offering beginning in the third quarter of this year.

“This partnership with JAJAH will help Yahoo! continue to provide a great communication experience to our millions of Yahoo! Messenger users,” said Sabrina Ellis, vice president of Yahoo! Messenger. “Yahoo! Messenger is one of the first communication tools consumers see and use when they turn on their computers, so it is critical that our partner mirror our commitment to our users, and JAJAH’s reliable VoIP network and proven customer- and carrier-friendly experience make it an ideal solution.”

Since 2006, Yahoo! Messenger users have been able to use “Phone In” and “Phone Out” to make and receive voice calls on their PC to and from landline and mobile phones.