Ericsson, Motorola, Nokia and Siemens mobile have completed their jointly developed Push to talk over Cellular (PoC) specification.
Based on the IP Multimedia Subsystem (IMS) as defined by 3GPP, the specification is intended to reduce marketplace fragmentation and provide end users with an easy-to-use push to talk experience wherever they may travel in the world.
The PoC specification leverages existing 3GPP, OMA, and IETF specifications and is, in fact, a bundle of six specifications including: requirements, architecture, signaling flows, group/list management, and two user-plane specifications (transport and GPRS).
The companies have submitted this specification to the Open Mobile Alliance (OMA) standards body for review as a baseline to provide an access-independent and globally interoperable standard for PoC.