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• TTY HCO - Transmit TTY characters, but receive by listening to earpiece
• TTY VCO - Receive TTY characters, but transmit by speaking into microphone.
• Hearing aids - Select to enable hearing air compatibility.
• RTT settings - Configure Real-time text (RTT) settings.
• Real-time text (RTT) call - Select to allow messaging during a call.
• Set RTT visibility - Set to Visible during calls (default) or Always visible.
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