[Asterisk-Users] dtmfmode=inband with G.729

[Jim Rosenberg]

It appears Asterisk can handle DTMF inband on only a limited selection of
formats, of which G.729 is not one. The issue appears to be something
involving "short data" -- whatever that is. (I'm inferring all this from
looking at dsp.c in the vicinity of the error message I was getting, which
pointed to line 1424.)

What *is* "short data"? Is this really a show-stopper for the G.729 format,
or is it just a case that nobody coded this?

I know that RFC 2833 is really a better way to go (this is for h323, so
there is no option dtmfmode=info ...) but I'm not getting that to work. (I
need to change firmware on my Cisco routers to get them to grok rfc2833.)

-T.i.A., Jim