[Asterisk-Users] DTMF digit dropping

[Paul Rodan]

Are you kidding? DTMF handling in Asterisk is the worst, it might not just
be Asterisk. Dropped digits is a common thing. INBAND basically plays the
sound of the DTMF digit, that's why G711 is the only codec it'll work on,
it's the only high enough quality codec to play a touchtone and it be
delivered correctly on the other side.

We get the occasional dropped DTMF with Lookieloo, NuFone, VoipJet and
BroadVoice. Across multiple servers running multiple Asterisk versions.
However, I know that the later Asterisk versions (Past month or so) fixed
some of the DTMF troubles we've had.

The only thing I can suggest is try running the latest stable w/ BroadVoice,
and maybe try rfc2833

I have a small IVR on my Asterisk server connected to BroadVoice, I always
used DTMF, but I tried to switch to rfc2833 the other day out of curiosity
and interesting enough, when I called into my IVR w/ my cell phone, it
recognized 1234 and whatever other digits I entered. So inbound DTMF worked
using ULaw, however I never tried outbound. Could have been a fluke though.
Give it a shot.



-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rich Adamson
Sent: Wednesday, January 26, 2005 10:08 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] DTMF digit dropping

Is it not possible to use sip debug or ethereal to "see" what digits
arrive at your site? (or do you already know the digits are mutilated
before getting to you?)


> I'm having the same problem with Voicepulse connect using IAX2. So, no, 
> it's not better IMHO. And I've been thinking about switching to SIP to 
> see if the problem goes away (I'm very reluctant to do so though) but 
> it's hard to know if the problem lies with Voicepulse (or Broadvoice in 
> your case) or whatever CLEC terminates your inbound number.
> 
> FWIW I have experienced the problem with Asterisk 1.0.2 and now also 
> with 1.0.5. It doesn't seem to be an Asterisk problem though because 
> the vast majority must not be having any issues with DTMF recognition.
> 
> -mark
> 
> On Jan 25, 2005, at 8:55 PM, Bryce Nesbitt (mailing list account) wrote:
> 
> > I run an automated information retrieval system, using Asterisk. Fairly
> > often the system misses a dialed digit.  Our codes are all 4 digits, 
> > see
> > lots of logs with:
> >
> >       4199  - OK
> >       530   - Invalid code
> >       330   - Invalid code
> >       5330  - OK
> >
> > As callers experience skipped codes.  We're using Broadvoice SIP with
> > inband DTMF (and we've tried every possible setting or option related 
> > to
> > DTMF).  Anyone else getting similar drops?  Any solutions.
> >
> > Is http://connect.voicepulse.com/ , using IAX, any better?


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