[Freeswitch-users] Re-2: Re: Re-2: Serious Problem detecting DTMF in bridged SIP call using ESL

Guido Kuth gk at exram.de
Wed Apr 29 12:20:42 PDT 2009

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 

Re: [Freeswitch-users] Re-2: Serious Problem detecting DTMF in bridged SIP call 
using ESL (29-Apr-2009 19:59)

Brian West <brian at freeswitch.org>

freeswitch-users at 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.


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 at freeswitch.org

-- Meet us at ClueCon!  http://www.cluecon.com

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