Motorola Solutions, Inc.

Phillip John Sidebottom

Daniel J McDonald

David R Mills

In a two-way radio frequency (RF) communications system having at least one fixed terminal, one or more channels, and a plurality of subscriber units, the method comprising, a device receives, from a first subscriber unit, an alert tone request identifying at least a type of alert tone and at least one destination. In response, the device causes one or more fixed terminals corresponding to one or more radio sites associated with the destination identified in the alert tone request to instruct their subscriber units to play back a locally stored or generated alert tone corresponding at each subscriber unit. Receiving subscriber units then play back the alert tone on a continuous, periodic, or semi-periodic basis, selectively mixing the alert tone with call audio if present.

Growing community of inventors

Wheelers Hill, Australia

Phillip John Sidebottom