If you look closely, the third phone from your left has
a little box below the phone. It is a TTY that slides
out. You see them in large public places such as airports
or sometimes at big shopping malls. You can identify them
if you look for the logo that you see on the wall to the
right.

I admit these tty's that slide out don't work that well
and it is confusing to use. BUT I am grateful for them
and it has helped me many times over.