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並前往https://www.motorolasolutions.com/content/dam/msi/docs/products/command-center-software/broadband-push-to-talk/ptt_technology_evolution_whitepaper_global.pdf

white paper ptt technology evolution - Motorola Solutions

Push-to-talk (PTT) is instant one-to-many or one-to-one mobile voice communication without protracted dialing, ringing, and answering steps in a regular ...

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