[asterisk-users] duration of rfc2833 generated dtmf

[John covici]

Well, this solution seemed not to work for me, maybe because I did not
set the minimum and also if I am using a sip phone or ATA, the
solution would not apply -- correct me if I am wrong on either of
these.

on Wednesday 04/15/2009 Mark G. Thomas(Mark at Misty.com) wrote
 > Hi,
 > 
 > On Mon, Apr 13, 2009 at 05:32:45PM -0400, John covici wrote:
 > > Hi.  I have a SIP provider which wants RFC2833 for the dtmfmode,
 > > however I would like to increase the duration of the tone, its pretty
 > > short and some IVR's are unhappy or don't detect it.  I did poke
 > > around, but it looks like when RFC2833 is used, it actually generates
 > > rtp packets of some sort, so I have no idea how to increase that
 > > duration.
 > > 
 > > Any assistance would be appreciated.
 > 
 > I had a similar problem.
 > 
 > Adding "dtmf" to the "console =>" line in logger.conf is tremendously
 > helpful in diagnosing the dtmf behavior.
 > 
 > My successful work-around was to recompile asterisk with the following 
 > adjustments. Asterisk then extends the duration of the short tones. I'm
 > puzzled why these aren't a run-time configuration settings, since I'd
 > think this would be a common problem.
 > 
 > [root at sylvester asterisk-1.4.24]# diff main/channel.c_orig main/channel.c
 > 91c91
 > < #define AST_DEFAULT_EMULATE_DTMF_DURATION 100
 > ---
 > > #define AST_DEFAULT_EMULATE_DTMF_DURATION 150
 > 94c94
 > < #define AST_MIN_DTMF_DURATION 80
 > ---
 > > #define AST_MIN_DTMF_DURATION 150
 > 
 > I also later got my provider (Vitelity) to provision my service
 > on a different server of theirs, which then also seemed to improve 
 > both their RFC2833 DTMF reliability and duration.
 > 
 > -Mark
 > 
 > -- 
 > Mark G. Thomas (Mark at Misty.com)
 > voice: 215-591-3695
 > http://mail-cleaner.com/

-- 
Your life is like a penny.  You're going to lose it.  The question is:
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you spend it?

         John Covici
         covici at ccs.covici.com