asterisk users - Jan 2008 - Distorted audio over Eicon Diva Server BRI

We are experiencing slightly distorted audio with playing of recordings on
our Asterisk server when the call comes in over our Eicon Diva Server BRI
card. An example is an incoming call to IVR and playing some of the standard
Asterisk voice prompts. Note that there is no audio problem with internal
access to the same recording. Neither is there a problem with calls not
involving the playing of recordings. The problem occurs consistently and is
not related to system load. According to Eicon support:

Asterisk is sending it's data packets (160 bytes each, i.e. 20ms) in too
large intervals. This causes the transmitter of the Diva Server card to
underrun and thus to fill with idle samples in regular intervals. It's
almost between any two packets where we have to insert samples.

0:00:29.710 CAPI20_PUT(030)

 0:00:29.730 CAPI20_PUT(030)

 0:00:29.751 CAPI20_PUT(030)

 0:00:29.771 CAPI20_PUT(030)

 0:00:29.791 CAPI20_PUT(030)

 0:00:29.812 CAPI20_PUT(030)

 0:00:29.832 CAPI20_PUT(030)

 0:00:29.853 CAPI20_PUT(030)

 0:00:29.873 CAPI20_PUT(030)

 0:00:29.894 CAPI20_PUT(030)

 

I wonder if anyone could provide any advice on how to continue
troubleshooting this issue? 

 

Regards

 

Cameron

 

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CSB wrote:
> Asterisk is sending it's data packets (160 bytes each, i.e. 20ms) in
too
> large intervals. This causes the transmitter of the Diva Server card to
> underrun and thus to fill with idle samples in regular intervals. It's
> almost between any two packets where we have to insert samples.
> 
> 0:00:29.710 CAPI20_PUT(030)
> 
>  0:00:29.730 CAPI20_PUT(030)
> 
>  0:00:29.751 CAPI20_PUT(030)
> 
>  0:00:29.771 CAPI20_PUT(030)
> 
>  0:00:29.791 CAPI20_PUT(030)
> 
>  0:00:29.812 CAPI20_PUT(030)
> 
>  0:00:29.832 CAPI20_PUT(030)
> 
>  0:00:29.853 CAPI20_PUT(030)
> 
>  0:00:29.873 CAPI20_PUT(030)
> 
>  0:00:29.894 CAPI20_PUT(030)
> I wonder if anyone could provide any advice on how to continue
> troubleshooting this issue? 
Sounds very similar to an issue I was having.

Are you using mISDN?

- --
Kind Regards,

Matt Riddell
Director
_______________________________________________

http://www.venturevoip.com (Great new VoIP end to end solution)
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On Tue, 8 Jan 2008, CSB wrote:
> We are experiencing slightly distorted audio with playing of recordings on
> our Asterisk server when the call comes in over our Eicon Diva Server BRI
> card. An example is an incoming call to IVR and playing some of the
standard
> Asterisk voice prompts. Note that there is no audio problem with internal
> access to the same recording. Neither is there a problem with calls not
> involving the playing of recordings. The problem occurs consistently and is
> not related to system load. According to Eicon support:
>
> Asterisk is sending it's data packets (160 bytes each, i.e. 20ms) in
too
> large intervals. This causes the transmitter of the Diva Server card to
> underrun and thus to fill with idle samples in regular intervals. It's
> almost between any two packets where we have to insert samples.
...
> I wonder if anyone could provide any advice on how to continue
> troubleshooting this issue?
I never heard of that problem before. Which versions of asterisk and 
chan_capi (I assume you use chan_capi) do you use?

If possible, can you provide a trace with
   set verbose 9
   capi debug
to me directly (not on the list, it is very big).
Also, a full ditrace would help too.

Armin