what is rtt calling

RTT stands for "Real-time Text," and it is a feature that allows users to send and receive text messages in real-time during a phone call. This feature is particularly useful for people who are deaf, hard of hearing, deaf-blind, or have a speech-related disability. RTT calls work over the same networks as traditional calling and texting, and anyone with a ten-digit cell number can use it to contact one another or make emergency calls to 911. To use RTT calling, users need to turn on the feature in their phones settings, and they can switch to RTT from voice or start an RTT call right away. RTT calls have an audio stream, and the text that users enter appears to the other person in real-time, unlike with chat messaging.