The third application scenario makes the best use of the multicasting technique. The IPR 100 allows a number of transceivers to be interconnected over the LAN or WAN. Each IPR 100 unit is linked to a common multicast group address. When one transceiver receives audio, voice packets are transmitted to the multicast address. Any other IPR 100 unit that is linked to that address will accept those VoIP packets and re-transmit the audio to its respective radio.