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PTT Phones / Push to Talk Phones Push-To-Talk (PTT) is a two-way communication service that works like a 'walkie talkie'. A normal cell phone call is full-duplex, meaning both parties can hear each other at the same time. PTT is half-duplex, meaning communication can only travel in one direction at any given moment. To control which person can speak and be heard, PTT requires the person speaking to press a button while talking and then release it when they are done. The listener then presses their button to respond. This way the system knows which direction the signal should be traveling in.
All Nextel phones have PTT. Other carriers are now offering the PTT feature on certain models in their line-up.
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