John C Klensin wrote:
> is needed to do anything useful.  Unlike what Paul seems to
> imply by his assertion that the signaling mechanisms are
> essentially audio because they are analogous to DTMF tones, I
> believe those non-text top-level types are differentiated by the
> base capability that is required to _render_ the type, 


RFC2046:
>     (3)   audio -- audio data.  "Audio" requires an audio output
>           device (such as a speaker or a telephone) to "display"
>           the contents.  An initial subtype "basic" is defined in
>           this document.


As Paul indicated, T.38 is used between gateways.

The receiving gateway turns the data into a telephone call.

In what way does this not satisfy *exactly* the requirements for the audio
top-level MIME type?

d/
-- 

  Dave Crocker
  Brandenburg InternetWorking
  bbiw.net

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