DTMF noise

hi

when dialing out from the D-link MGCP phone (they actually work now - most of the time), I get lots of DTMF noise whenever the other person talks. I only get this from the MGCP phone - not with MSN messenger. This seems to be an error in isdn4linux falsely detecting DTMF in speech with Asterisk creating the actual noise.

This testing has been done on hhe following cards (from lspci)

02:09.0 Network controller: Cologne Chip Designs GmbH ISDN network controller [HFC-PCI] (rev 02)
02:0a.0 Network controller: Cologne Chip Designs GmbH ISDN network controller [HFC-PCI] (rev 02)
02:0b.0 Network controller: Cologne Chip Designs GmbH ISDN network controller [HFC-PCI] (rev 02)

roy

Roy Sigurd Karlsbakk, Datavaktmester
ProntoTV AS - http://www.pronto.tv/
Tel: +47 9801 3356

Computers are like air conditioners.
They stop working when you open Windows.

The DTMF detector in the linux kernel is fairly simplistic and doesn't do many relative energy tests. The Zapata library has a much better tone detector, but it is FP, and so would have to be made fixed point. If nothing else, it may provide some lessons for the ISDN folks.

Mark