Help Can the touch tones (DTMF) be made to sound for a longer time

[Johnny Cakes]

The Epic touch tones (DTMF) play for a brief second each time you press the key. I would like them to play for longer than the do now.

I need this for controlling a call-in system I have -- the Epic's touch tones are too short to trigger it.

Is there a setting for "long tones" or something like that?