asterisk users - Aug 2004 - Sound deformation during conversation or IVR message

Hi,

 

We have a working asterisk with 1 E1 and a TE405P. 

 

During conversation, when one side is speaking, the other hears sometimes
(every 5 to 20 seconds, it is random) a little deformation of the
voice/sound. It sounds like "scricth" and not during more than 0.5
seconds.

 

We have exactly the same problem when asterisk give messages to caller by an
IVR.

No need to be lot of people on the E1, with 1 person connected, the problem
appears.

 

After monitoring the cpu usage, we didn't notice big peak. The cpu sometimes
rise up to 20% with process kjournald, and it seems to be at the same time
of our problem but nothing else.

 

- How can we reduce or solve this problem ?

- Do you ever had the same problem ?

 

We have asterisk on a Red-hat 7.3 with P4 2,6 Ghz with 512 Mo. One TE405P
with one E1.

 

Thanks in advance for your answer.

 

Regards

 

R?gis

 

 

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On Wed, 25 Aug 2004, R?gis MARTIN wrote:
> We have a working asterisk with 1 E1 and a TE405P. 
> 
> During conversation, when one side is speaking, the other hears sometimes
> (every 5 to 20 seconds, it is random) a little deformation of the
> voice/sound. It sounds like "scricth" and not during more than
0.5 seconds.
> 
> After monitoring the cpu usage, we didn't notice big peak. The cpu
sometimes
> rise up to 20% with process kjournald, and it seems to be at the same time
> of our problem but nothing else.
It can be the disk access when the ext3 log is flushed causing missed 
interrupts. 

Whad does 'cat /proc/zaptel/1' show? Does the missed interrupts counter 
increment when you hear the noise?

What kind of disks do you have?

If you are using ide disks then you can try setting the unmasq irq bit 
with "hdparm -u1 /dev/hda" or whatever device your drive is.

Peter