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.
--
Your life is like a penny. You're going to lose it. The question is:
How do
you spend it?
John Covici
covici at ccs.covici.com
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. > >If your provider insists on rfc2833, then their servers will be responsible for setting the tone duration sent to PSTN lines.
Kristian Kielhofner
2009-Apr-14 16:15 UTC
[asterisk-users] duration of rfc2833 generated dtmf
On Mon, Apr 13, 2009 at 5:32 PM, John covici <covici at ccs.covici.com> 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. > > -- > Your life is like a penny. ?You're going to lose it. ?The question is: > How do > you spend it? > > ? ? ? ? John Covici > ? ? ? ? covici at ccs.covici.comJohn, Assuming this is Asterisk 1.4 or later... The duration used by Asterisk is the same duration sent from the phone. The duration of those DTMF key presses should match the time the user is holding down the key. What type(s) of phones are these? You should also look into using Asterisk 1.4.24.1 or later (if you aren't already). There have been many improvements to the RTP code to better handle quirks with the equipment (especially Sonus) used by various providers. Assuming your provider is to spec (and so is your phone) your provider should not be complaining that the duration of your DTMF key presses are too short... With that being said AFAIK there is no way to specify a minimum duration for an RFC 2833 DTMF in Asterisk on a bridged channel. -- Kristian Kielhofner http://blog.krisk.org http://www.submityoursip.com http://www.astlinux.org http://www.star2star.com
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 15094c94 < #define AST_MIN_DTMF_DURATION 80 ---> #define AST_MIN_DTMF_DURATION 150I 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/