A method and apparatus for providing an efficient dormant mode for push-to-talk communication devices in a group communication network provides for determining whether the net has been inactive for a predetermined first time period and, if so, causing each member of the net to enter a control-hold mode,...http://www.google.es/patents/US6904288?utm_source=gb-gplus-sharePatente US6904288 - Controller for providing an efficient dormant mode for a group communication network
Controller for providing an efficient dormant mode for a group communication ...
