TTD / TDD / TTY device

I have been asked to put a device for disables on phone system. Is there anyway we can do that with Freepbx. Is it even supported.

I think that as long as DTMF is correctly set up it should work… (any gurus feel free to step in and slap me).

FreePBX Administration, click on Extensions. Under Device Options, you will see dtmfmode. In my case, RFC2833, but I don’t use TTD / TDD / or TTY…