The Talker is not a standalone application but it requires a specific device, the i-NeXt Radio Media Gateway, to connect to. Use the Talker via the internet or a WiFi network to make a PTT call over the PMR (or LMR) network remotly connected by your mobile pmr transceiver. No third party service is needed, just use an i-Next Radio Media Gateway.
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Enhanced audio quality when operating on mobile network