Microsoft agreed to use JahJah's VOIP software to let business customers make voice calls over the Internet from computers and landlines. JahJah serves VOIP to technology companies, carriers, mobile operators and enterprises, which means it competes with pretty much any Web-based calling platform, from established specialists such as Skype and Vonage to fellow upstarts such as RingCentral and even Google Voice. JahJah will be providing SIP Trunking services for Microsoft Office Communications Server 2007 Release 2. This’ll enable enterprise customers to connect phone calls from computers, IP-phones and mobile phones to almost any device or network. “SIP Trunk’s basically a concurrent call that’s routed over the IP backbone of a carrier using VOIP technology. With JahJah's VOIP platform, companies using Microsoft OCS 2007, which bundles e-mail, instant messaging, Web conferencing and VOIP, won't have to buy additional hardware and software to power their voice calls.”