Channel summary for new member when joining a talkgroup

Apparatus and method for displaying information

Method for determining active communication sessions and communication session information server

System and method for permitting recordation of voice transmissions among group members of a communication group of wireless communication devices

Method for determining active communication sessions and communication session information server

System and method for managing user preference profile

Distributable, scalable, pluggable conferencing architecture

Push-to-talk capacity enhancement

Method and system for priority handling of dispatch call requests