IP telephony provider JAJAH announced Tuesday its SIP trunking services are certified to work with Microsoft Corp. Office Communications Servicer 2007 R2.

Released in February, R2 is the first upgrade since OCS was launched in October 2007. It improves conferencing and voice capabilities and adds new developer tools – all with the goal of better infusing unified communications into business processes.

By connecting directly with JAJAH’s global carrier-grade IP network, Microsoft OCS users can make low-cost voice calls from their computers, IP phones and mobile phones to virtually any device in the world.

“The JAJAH qualification on Office Communications Server 2007 Release 2 is a clear indicator of the strength of JAJAH’s platform and quality as a carrier-grade SIP solutions provider,” said JAJAH CEO Trevor Healy. “Enterprises across the world can implement VoIP and unified communication easily and cost effectively with Microsoft and JAJAH.”

JAJAH’s IP communications platform is used by technology companies, carriers, mobile operators and enterprises, including Intel and Yahoo!