15.7 For each application that supports real-time text (RTT) communication, the transmission delay for each input unit is 500ms or less. Is this rule respected?

Test 1 (15.7)

iOS and Android

1. Check that the application supports real-time text (RTT) communication.
2. If so, activate the application and the written communication functionality on two separate terminals and connect them to the same session.
3. Enter text on the first terminal and observe its appearance on the second terminal. The appearance on the second terminal must be instantaneous (less than half a second). Depending on how the functionality is configured, each character is not sent individually. In fact, if the RTT communication functionality implements word prediction, it is when the desired word is selected that it is sent, and not when the first characters used to trigger the suggestion display are entered. A simple observation test may be sufficient to observe the instantaneous appearance on the terminal receiving the written message.
4. If this is the case, the criterion is validated.