Motorola Corporation

Motorola Solutions, Inc.

John T Mistro

Daniel J McDonald

Randy L Ekl

Marc W Cassidy

Erick Loven

A radio communication system supports talk group communication and multi-group communication. Upon initiating a multi-group communication, the system causes any active talk group speakers in the talk groups included in the multi-group to dekey by changing the identifier in a monitored control channel of the talk group from the identifier of the present talk group speaker to a different value.

Method and system for automatically dekeying a talk group speaker to join a multi-group communication

A method and apparatus are provided for reducing audio truncation during a call in a trunked radio system. The method includes the steps of providing a multicast IP address of a rendezvous point to a first participant of the call to forward multicast audio of the call to a second participant of the call and using a dummy host to add an IP address for the second participant to the multicast IP address of the rendezvous point.

Method and apparatus of avoiding audio truncation in trunked systems

A method of registration in a communication system includes the steps of detecting ( ) an elevated registration level of at least a part of a communication system, selecting ( ) a group recovery time, determining ( ) a first random registration time that is less than or equal to the group recovery time, registering ( ) a first communication unit ( ) from a first talkgroup at the first random registration time, and upon receiving ( ) a group activity message for the first talkgroup, delaying ( ) registration by at least a second communication unit ( ) from the first talkgroup.

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Carol Stream, IL, United States of America

John T Mistro