ADAAG Manual

Using TTYs

Many TTYs are connected to phones by placing the handset in an acoustic coupler although a number of models connect directly to a standard analog phone line. On a TTY call, both parties must have a TTY. (Title IV of the ADA establishes a 24-hour relay service so that calls can be made through an intermediary when only one party has a TTY). Short words and sentences save time and many abbreviations and contractions are used. Certain conventions are standard, such as typing "GA" (go ahead) after each message; this tells the other person on the line to begin typing a response.