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 K?nigswinter Germany fon +49(2244) 870663 fax +49(2244) 870664 mobil +49(179) 1267353 web http://www.gwsnettech.de mail guido.hecken at gwsnettech.de