Thank you again Brian. The reason why I want to test with inband dtmf is that in the real environment FS will be behind a conventional ISDN PBX which will work as a gateway to the ISDN Network. So I do not know if the PBX will do something like a translation between DTMF Tones to rfc and backwars. If you have experience with this any help will be very welcome....Guido Original Message processed by David InfoCenter Subject: Re: [Freeswitch-users] Re-2: Serious Problem detecting DTMF in bridged SIP call using ESL (29-Apr-2009 19:59) From: Brian West <brian@freeswitch.org> To: freeswitch-users@lists.freeswitch.org Well the best option is to NOT use inband at all if possible. And use RFC2833 which eyebeam/xlite support as do most providers out there... You do not HAVE to start_dtmf on sip channels unless they only send the DTMF inband. set the dtmf-type back to rfc2833 and restart FS. /b On Apr 29, 2009, at 12:48 PM, Guido Kuth wrote: First thanks for your reply. I have subscribed to all Events, so this can't be the mistake. I sent start_ dtmf app to FreeSwitch in caller channel and the wiki says that you have to do this on sip channels to enable inband dtmf. I checked sofia.conf and I have found that param dtmf-type is commented out. Would it be helpful to set this to "info"? I think setting it to "rfc2833" would not be very meanigfull. I will try to update to svn trunk tomorrow. Again thanks for first help...Guido Brian West brian@freeswitch.org -- Meet us at ClueCon! http://www.cluecon.com