This link will take you to a phone keypad that generates the
touchtone sounds by typing the numbers on your numpad. I was unable to use
JAWS to get into the text edit box to enter the whole number. If you are
able to do this there is then a DIAL button that does work with the spacebar
in JAWS. Otherwise you can just record the tones as you dial them on your
numpad.
http://www.dsptutor.freeuk.com/dtmf/TG102.html
If you do not have a client to record from your computer speaker to an MP3
file, you ca find several at cnet.com in their downloads section.