Text telephone (TTY) mode is used to send text over a telephone line. A TTY device must be connected to the computer to interpret the modified audio otherwise you might experience poor audio quality. Using TTY mode in a conference call may also cause audio quality issues.
TTY mode is turned off by default. To turn it on:
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Connect a TTY device to your computer.
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In the LyncMicrosoft Store app, swipe in from the right edge of the screen, and then tap Settings. (If you’re using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Settings.)
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In the Phone accessibility section, under TTY, move the slider to the right to turn on TTY mode.
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Sign out of Lync, and then sign back in.
