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Reference.org
Push-to-talk
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<p>Push-to-talk (PTT), also known as press-to-transmit, is a method of having conversations or talking on <a href="/facts/Duplex_(telecommunications)/LCULeVxr">half-duplex</a> communication lines, including <a href="/facts/Two-way_radio/e6JKFtdo">two-way radio</a>, using a <a href="/facts/Switch/vqbNDgYm">momentary button</a> to switch from voice reception mode to transmit mode. </p>