[asterisk-users] duration of rfc2833 generated dtmf

[John covici]

on Tuesday 04/14/2009 Kristian Kielhofner(kristian.kielhofner at gmail.com) wrote
 > 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.com
 > 
 > John,
 > 
 >   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.

OK, thanks for that info -- but it seems to me no matter how long I
press the keys on the phone, (connected to a Digium board) the other
end gets the same duration.  Now, the problems I run into are not
dialing the phone number, but dtmf on the call such as an IVR.  Some
of them don't like what seems to be a too short key press, whereas if
I call  the same number from the cell phone, there is no problem.


-- 
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