On Monday 14 April 2008 21:00:34 Harald Welte wrote: > On Sun, Apr 13, 2008 at 07:57:02PM -0500, Hans L wrote: [...] > AFAIR, the DTMF key press is encoded and send over the Um (air) > interface to the BTS/BSC/MSC and then in the end converted into > actual audible sounds. > > Please see Page 22 of http://www.chu.edu.tw/~lhyen/wc/gsm.pdf for a > graphical illustration how this works.
This imply that there is a data channel available. Can you trasmit anything else that DTMF? What is the bandwidth of this channel? --
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