Text telephone (TTY) mode is used for text communication 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 during the call. Using TTY mode in a conference call may also cause audio quality issues.
Note: TTY mode may not be available in your region or for your service.
TTY mode is turned off by default, to turn on the feature:
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Connect a TTY device to your computer.
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Click Turn on TTY mode, under Phone accessibility.
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Sign out of Skype for Business, and then sign back in.
