Make and receive RTT calls in FaceTime on Mac
If you have difficulties hearing or speaking, or want to call someone who does, you can use Real-Time Text (RTT) for your phone calls, if your carrier supports it. When someone calls you, a notification appears on your Mac and you can take the call as an RTT call.
Set up RTT phone calls
On your iPhone, go to Settings > Accessibility .
Tap RTT/TTY, then turn on Software RTT/TTY.
When RTT is on, appears in the status bar at the top of the screen. You can choose additional options for RTT calls on your iPhone.
On your Mac, choose Apple menu > System Preferences, then click Accessibility .
Click RTT, then select Enable RTT.
Note: If you don’t see RTT, check that you completed all the setup steps. If you still don’t see RTT, it may not be supported on your Mac.
Choose additional options. For more information, click the Help button in the bottom-right corner.
When RTT is set up on your Mac, the RTT button is shown—for example, in a card in the Contacts app or in FaceTime—to indicate that you can make or receive an RTT call.
Make RTT calls from FaceTime on your Mac
Important: When making an emergency call in the U.S. on your Mac, special characters or tones are sent to alert the operator. The operator’s ability to receive or respond to these tones can vary depending on your location. Apple doesn’t guarantee that the operator will be able to receive or respond to an RTT call.
In the FaceTime app on your Mac, sign in and make sure FaceTime is turned on.
Set up your iPhone and FaceTime on Mac for phone calls and RTT calls, if you haven’t done so already.
Click New FaceTime, enter a phone number in the pop-up window, press Return, click , then choose RTT Call or RTT Relay Call.
If you have a card for the person in the Contacts app, you can just enter the person’s name, or select them from Suggested.
Choose RTT Relay Call when you need to call someone who may not have RTT capabilities—this connects the call to a person who can assist you. See Change RTT preferences for accessibility for more information about the RTT relay number.
Note: If you’re restricted to calls with only certain people, an hourglass icon appears next to those people you can’t call.
After the other person accepts the call, click RTT, then start typing.
If you selected Send Immediately in Accessibility RTT preferences, the recipient sees each character as you type. Otherwise, press Return to send the message.
Answer RTT calls on your Mac
On your Mac, when a notification appears in the top-right corner of the screen, do one of the following:
Accept an incoming call: Click Accept, then click RTT. (RTT is available even if you haven’t set it up.)
Decline a call: Click Decline.
Tip: If the call came from someone you don’t want to receive calls from, you can block the caller.
Decline a call and send a message using iMessage: Click next to Decline, choose Reply with Message, type your message, then click Send. Both you and the caller must be signed in to iMessage.
Decline a call and set a reminder to call back later: Click next to Decline, then choose how long you want to wait to receive a reminder. When the time comes, you receive a notification—click it to view the reminder, then click the link in the reminder to start the call.
If your Mac has a Touch Bar, you can use it to accept a call, decline a call, decline and send a message, or decline and set a reminder.
You can’t receive a call from someone who’s restricted by communication limits in Screen Time, but it appears as a missed call in the FaceTime window or in Notification Center.