2259652-A1 cites 3 patents.
[en] A push-to-talk communication device to participate in a group communication net (100) is claimed. The group communication net (100) comprises a controller (104) to manage the group communication net (100) and interface with the push-to-talk communication devices (108, 112 and 116). A processor converts information signals into packet data suitable for transmission over a distributed network. The processor may also have identification information, and updates its identification information when its current identification information has or is about to change. The processor then transmits its new identification information to the controller (104). The push-to-talk devices (108, 112 and 116) also comprise a transmitter to transmit packet data through a first channel to the controller. A receiver receives packet data through a second channel from the controller. The push-to-talk devices (108, 112 and 116) also comprise a user activated mechanism to activate the transmitter when a user of the communication device wishes to transmit packet data to the controller.