Push-to-talk over cellular ( PoC) is a service option for a cellular phone network that enables subscribers to use their phones as walkie-talkies with unlimited range. Manufacturers now make units specifically designed for PTT over cellular ( POC or PoC). Some systems use PTT ID to identify the speaker.
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In situations where a user may be too busy to handle a talk switch, voice operated switches are sometimes employed. This type of switch was historically called a pressel. Less commonly, a separate hand-held PTT switch may be used. For heavy radio users, a PTT foot switch may be used, and also can be combined with either a boom-mounted microphone or a headset with integrated microphone. The PTT switch is most commonly located on the radio's handheld microphone, or for small hand-held radios, directly on the radio. Citizens Band is another example of classic push-to-talk operation. Similar considerations apply to police radio, the use of business band radios on construction sites, and other scenarios requiring coordination of several parties.
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In doing so, they are aware of each other's actions and intentions, and do not hear any background noise from the ones who are not speaking. Those under the same frequency can hear others' transmissions while using procedure words such as "break", "break break" to separate order during the conversation (ICAO doc 9432). For example, an air traffic controller usually talks on one radio frequency to all aircraft under his/her supervision.