Communicating with a TDD through a PC questions.

[Todd]

Does anyone know of a way to use a PC to communicate with a TDD?
Alternately does anyone know what protocol a TDD uses?  For those
of you who don't know a TDD is a telephone for the deaf.  It works
over regular telephone lines but instead of voice it uses an alpha-
numeric display and keyboard.  I know AT&T makes TDD's but I have
no contacts in that area.

Send replies to:
Terry Todd @ ihlpl!tlt or 312-979-2077 or

Terry L. Todd
AT&T Bell Laboratories
Office # 6U-201
2000 N. Naperville Road
Naperville, IL  60566-7033