Unlicensed Mobile Access (UMA) technology is the standard for fixed-mobile convergence (FMC). UMA technology enables access to mobile voice, data and IMS services over IP broadband access and unlicensed spectrum technologies. By deploying UMA technology, service providers can enable subscribers to roam and handover between cellular networks and public and private unlicensed wireless networks using dual-mode mobile handsets. With UMA, subscribers receive a consistent user experience for their mobile voice, data and IMS services as they transition between networks.

The UMA specifications were created by Alcatel, AT&T Wireless, British Telecom, Cingular, Ericsson, Kineto Wireless, Motorola, Nokia, Nortel, O2, Research in Motion, Rogers Wireless, Siemens, Sony-Ericsson and T-Mobile US. The specifications are available for download at www.umatechnology.org