Description taken from public sources. Read disclaimer.
From the Developer
Hollr is a PTT app for all smartphones and PCs. Users can talk between platforms and carriers without incurring monthly fees. The app is designed to be integrated to a radio gateway so all IP devices can PTT into the 2-way system. This can reduce the number of radios needed by agencies. As grants may be reduced ROIP will be a way to stretch budgets.Deployment in a city or county with homogeneous radio systems would involve installing a gateway with multiple ports or groups. In a county or city with disparate users each agency just buys a gateway and gets their own group on the private server. The administrator can add or delete user groups on the fly for greater flexibility.
.99 cents Apple Store -free at google play
Download from Blackberry World
Download from Windows Phone Store
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