I was hoping that TTY capability would let me use the 6600 to call my deaf friends directly, using the QWERTY keyboard as a text telephone. (See: http://en.wikipedia.org/wiki/Telecom...s_for_the_deaf )

However, either that's not what the 6600's TTY setting does, or else I'm doing something wrong when I try to use it.

What *is* the TTY setting on the 6600 and how is it used?