A communication system (10) includes a group call controller (GCC) (26) for use in establishing, maintaining, and controlling the provision of group call services within the communication system (10). To initiate a group call session for a particular subscriber group, a group call request is delivered...http://www.google.com.au/patents/US6456855?utm_source=gb-gplus-sharePatent US6456855 - Method and apparatus for establishing a group call session in a communication system
