How to Enable TTY Mode in Microsoft Teams
You enable Teletypewriter (TTY) mode in Microsoft Teams to allow individuals who are deaf or hard of hearing to communicate effectively during calls.
TTY mode is a setting that translates voice calls into text, enabling you to send and receive messages using a TTY device. This makes your Teams calls accessible to users who rely on text-based communication.
This crucial accessibility feature supports both outgoing and incoming calls within Microsoft Teams. For instance, you can activate it by navigating to your Teams settings and selecting the “Accessibility” option.
Enable TTY mode in Microsoft Teams by going to Settings, then Accessibility, and turning on the Teletypewriter (TTY) switch. This feature requires a physical TTY device connected to your computer and is only available in the desktop client.
Hardware Requirements and Setup
To use TTY mode in Microsoft Teams, you’ll need a physical TTY device plugged into your computer, along with a serial-to-USB adapter.
How to Enable TTY Mode in Microsoft Teams
You can turn on TTY mode in Microsoft Teams by going to the Settings menu and then selecting Accessibility.
1. Open the Microsoft Teams app from your Start menu.

2. If the app’s already running, you can find it on your Taskbar.

3. Click the Settings and more (…) icon next to your profile picture, then choose Settings.

4. Select the Accessibility tab from the left-hand sidebar.
5. In the Hearing section, switch Teletypewriter (TTY) mode to On.

6. Click Save to apply your changes.
Troubleshooting TTY Device Issues
If your TTY device isn’t working with Teams, check your Windows Sound settings and make sure your audio drivers are installed correctly.
Broader Accessibility Context
Teams offers several tools for inclusive communication. While TTY is for hardware-based text communication, Live Captions provide real-time text for spoken audio using AI. Sign Language View allows users to prioritize video feeds of sign language interpreters. For more information, check out the official Microsoft Accessibility support documentation.
Summary
Enabling TTY mode in Teams lets people with TTY hardware join calls easily, and you can turn it on in Settings under Accessibility.
Do I need special hardware to use TTY mode in Teams?
Do I need special hardware to use TTY mode in Teams?
Yes. TTY mode in Microsoft Teams requires a physical TTY device connected to your computer. The software acts as an interface for the hardware, but it cannot function without the external device plugged into your system to transmit and receive the text signals over the phone line.
Is TTY mode available in the Teams web app?
No. TTY mode is currently only supported in the Microsoft Teams desktop client. The web browser version of Teams can’t connect to local hardware devices like TTY machines, so you’ll need to use the installed desktop app for this feature.
How does TTY mode differ from Live Captions?
TTY mode is a hardware-based solution for text-to-voice communication over phone lines. Live Captions is an AI-driven software feature that transcribes spoken words into text on your screen during meetings. TTY is for specific phone-based accessibility, while Live Captions are for general meeting comprehension.
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