For information purposes:
We had problems with proper dtmf recognition.
Asterisk Version: SVN-branch-1.4-r114083
SNOM FW: 7.1.30

With the above constellation dtmf tones sometimes worked and sometimes not.
Already a few hours and much testings later, we "found" and used the
configuration parm 
relaxdtmf.
In the past we diddn't use this parameter at all without any dtmf problems.
Perhaps a silent change in asterisk's way of handling dtmf?

With relaxdtmf=yes in sip.conf's general context, dtmf tones seem to work
reliable.
Not shure about other magic side-effects, but it helped.

In the hope of saving someone else "a few" hours...

Guido
 
gwsNetTech
Guido Hecken

Quirrenbacher Str. 36
53639 Königswinter
Germany

fon     +49(2244) 870663
fax     +49(2244) 870664
mobil  +49(179) 1267353
web     http://www.gwsnettech.de
mail    [EMAIL PROTECTED]

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