The GACP | Accenting Professional Law Enforcement Through ...

Jan 01, 2019 · The phone is used to make, and answer calls in the same way that hearing people use a telephone. A TTY call requires two TTD's, each with a keyboard and a display. During a call, one person types a message to the other person, who reads the message on their TTY display. Both people take turns typing and reading during the conversation. ................
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