[asterisk-users] DAHDI DTMF problem?

[Bill Dunn - VCI Internet Services]

    I used the dahdi_monitor to record the audio on the T1 channel of the 
working server and the new server. The audio stream of the working server 
allowed me to hear the audio I heard over the phone call plus the DTMF at 
the very beginning. The audio of the new server was completely messed up. I 
could barely make out the where the DTMF and the audio were in the file. If 
I didn't have a working sample I wouldn't know what it was. And, the 
beginning of the new server sample always contains a hum or tone in it 
whereas the working server does not have that.

What does this tell me?


 Bill Dunn



----- Original Message ----- 
From: Shaun Ruffell
To: Asterisk Users Mailing List - Non-Commercial Discussion
Sent: Friday, July 06, 2012 12:16 PM
Subject: Re: [asterisk-users] DAHDI DTMF problem?


On Fri, Jul 06, 2012 at 11:10:43AM -0500, Tim Nelson wrote:
> ----- Original Message -----
> >
> > It has a Digium Wildcard TE122
>
> If it has an onboard echo canceler, try disabling it and retrying.
> Just a shot in the dark, going from my experience with other cards
> and same symptoms. If the card is new(ish) I would think Digium
> could provide support to you for determining the DTMF problems.

Bill,

To repeat what Tim said, if you're eligible I would recommend
contacting Digium's support department. There are many variables
with a new install and Digium support would be happy to help you
troubleshoot.

Some other things to try in order to isolate the drivers / hardware
change from the Asterisk change. You could:

a) Install the exact same versions of Asterisk / DAHDI that you used
previously on the new server with Centos 5.8.

b) Run a local pattern test to verify the host <-> card
communication is valid. If you have problems here there may be a
framebuffer configured or a disk controller running in combined mode
preventing the cards interrupt handler from running in a timely
fashion.

c) Use dahdi_monitor to record the audio on the channel you're
testing with and open it up with audacity and verify that the DTMF
looks correct. If it does, then most likely there is a problem with
chan_dahdi reading the audio from the drivers quickly enough.

d) Ensure that you are only loading the Asterisk modules you need in
case you're running on a system with limited memory and the asterisk
process is dropping audio while paging in code. (See DAHLIN-241 [1])

[1] https://issues.asterisk.org/jira/browse/DAHLIN-241

Cheers,
Shaun

-- 
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: www.digium.com & www.asterisk.org

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