What Does Push-to-Talk (PTT) Mean?
Push-to-talk (PTT or P2T) is a method of telecommunications that normally uses a half duplex system. As the name implies, Push To Talk (PTT) requires the person talking to press a button for the other party at the other end of the line to hear him. Because basic PTT uses half duplex, only one person can talk at a time. Police radios, air traffic controller telecommunications systems, and even some cellular technologies (e.g. iDEN) employ Push To Talk.
Techopedia Explains Push-to-Talk (PTT)
PTT users communicate bidirectionally but not simultaneously during voice transmission, i.e., callers take turns speaking and listening via push button switching.
