[asterisk-users] Distorted audio over Eicon Diva Server BRI

[Armin Schindler]

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