A land mobile radio communication system has a plurality of cell sites, each of which typically has a plurality of repeaters. The over-the-air radio communications between the cell site repeaters and the mobile radios in the system include both a voice component and a data component. The data...http://www.google.ca/patents/US5787345?utm_source=gb-gplus-sharePatent US5787345 - Automatic voice prompts in a land mobile radio system
