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DTMF board is used to enable or disable options on a repeater or a radio system. They are also used for phone patch (telephonic relay) if the repeater has an interconnect capability.
DTMF also serves as an Automatic Number Identification system, or ANI. In handheld and vehicle mounted units the DTMF board can transmit the unit's identifier before or after the unit transmits, or both. This can come in handy for identifying who is talking in larger county 911 systems, or for any system with a large number of units, but can be used regardless of the size of a given system.
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