PoC System And Method and Terminal Apparatus for Establishing and Managing Multimedia PoC Session to Processing Multimedia Calling Service

The invention PoC session establishment, and between PoC client that supports the variety of media types management systems and relates to a method and terminal device, OMA PoC (PTT over Cellular) performing the multimedia call service PoC client a plurality of media types a support and, when not in the media type supported by the PoC client, a response message by a common, enables the establishment of the PoC session set supporting only the media type to enable media transfer in the first response message to the session established. In addition, we propose a method to join the new media type occurs, or to manage efficiently a session to update the recipient upon variation of the existing participating media type listed. PoC sessions, multimedia, mobile communications