Push to Talk (PTT)
This is a way of communicating on the half-duplex communication line, includes receiving and transmitting devices (walkie-talkie) by the way of pressing the button for switching to the voice mode or transition to the listening mode. It works as a radio speaker; one can talk by pressing the button and can listen to a voice message by releasing the button.
G.729 is an audio algorithm of voice transfer data compression that compresses the digital voice into 10 ms duration packages.
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