[asterisk-dev] Off the wall idea - transmit wideband G722 or Speex over ISDN

[Stephen Davies]

Hi,
Off the wall idea that I'd like to hear comments about:

End-to-end ISDN call is basically a 64k data pipe.
Can we find a way to stay within the rules of ISDN, but "discover" that our
call is from an Asterisk box and to another.  Once we discover we are
talking to a friend, we could do things like switch to encoding with G722 or
Wideband Speex.

"Discovery" could be to send and detect a special bit-pattern (selected to
be inaudible or innocuous), and a similar response.  It needs to only be
detectable if the link is really 64k "bit clear".

How nifty would it be to pick up your SIP phone, dial a remote party and
suddenly find yourself on a wideband call...

Steve
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