Patent ID: 7787877

Claim:
A method of reducing audio truncation during a call in a trunked radio system comprising: at a first controller: receiving an access request message for a first radio from a second controller; upon receipt of the access request message, transmitting a ring message to the first radio; receiving an acknowledgment message from the first radio; selecting a multicast IP address and configuring a rendezvous point at the multicast IP address; and instructing the second controller to assign a dummy host, having an IP address, for a second radio such that the rendezvous point adds the IP address of the dummy host to a distribution tree prior to the start of the call in order to reduce audio truncation at the first radio, wherein the instructing step is performed upon a determination that the first controller is separated from the second controller by more than three routers, or that a round-trip time delay between the first controller and the second controller exceeds a threshold.