Re: Customer complains of noise on line I cannotreproduce.

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Customer complains of noise on line I cannotrep...
\ Royce Souther (27 Feb 2008)
. \ Chris Mason (Lists) (27 Feb 2008)
. \ Steve Totaro (27 Feb 2008)
. . \ Royce Souther (8 Mar 2008)
. . . \ Steve Totaro (8 Mar 2008)
. . . . \ Royce Souther (8 Mar 2008)
. . . . . \ Grygoriy Dobrovolskyy (8 Mar 2008)
. . . . . . \ Fons van der Beek (9 Mar 2008)
. . . . . . . \ Grygoriy Dobrovolskyy (9 Mar 2008)
. . . . . . . . \ Royce Souther (9 Mar 2008)
. . . . . . . . \ Fons van der Beek (9 Mar 2008)
. . . . . . . . . \ Grygoriy Dobrovolskyy (9 Mar 2008)
. . . . . . . . . . \ Fons van der Beek (9 Mar 2008)
. . . . . . . . . . . \ Fons van der Beek (12 Mar 2008)
. . . . . . . . . . . . \ Grygoriy Dobrovolskyy (14 Mar 2008)
. . . . . . . \ Royce Souther (9 Mar 2008)
. . . . . . . . \ Grygoriy Dobrovolskyy (9 Mar 2008)
. \ Gordon Henderson (27 Feb 2008)
. \ Fons van der Beek (27 Feb 2008)
. . \ Eric Wieling (27 Feb 2008)
. . . \ Steve Totaro (28 Feb 2008)

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Subject:	Re: Customer complains of noise on line I cannotreproduce.
Group:	Asterisk-users
From:	Steve Totaro
Date:	28 Feb 2008

He said in the OP that he is using a Digium TDM400. I guess turning
EC off could help diagnose that pretty quickly.

I have diagnosed this issue (when it was hardware failure) by creating
different dialout extensions in the dialplan, to hit zap/1, then zap/2
etc.

Then I found it was only on zap/4 so I shuffled the modules. One time
the problem moved to zap/1 so it was a module, another time the
problem stayed on zap/4 so it was the port on the card itself.

Thanks,
Steve Totaro

On Wed, Feb 27, 2008 at 4:57 PM, Eric Wieling <eric> wrote:
> Could this be ECFO?
>
> Echo Canceler Freak Out, this happens when the rxgain is too high and
> the echo canceler freaks out. Some users describe it as "screeching",
> "feedback", "static", or other useless terms. If users report "static"
> on a system where there cannot be static (all digital, PRI, SIP, etc),
> you might be experiencing ECFO.
>
> Try lowering your rxgain and txgain.
>
>
>
> Fons van der Beek wrote:
> > Perhaps irq sharing?
> >
> > Royce Souther schreef:
> >> I have setup a few Asterisk systems for customers using Digium TDM400
> >> cards and Aastra phones. No problems with sound quality at all except
> >> at this one site.
> >>
> >> Every time I try their system I don't hear any problems but they tell
> >> me that it is really bad. They describe it a a loud scratching sound.
> >>
> >> Are there any tests that can be done to pinpoint the problem? Has
> >> anyone seen this before? Are there known causes for this?
> >>
> >> --
> >> Open Source: To innovate then create
> >> Proprietary: To imitate then litigate
> >> ------------------------------------------------------------------------
> >>
> >
>
> --
> Consulting for Asterisk, Polycom, Sangoma, Digium, Cisco, LAN, WAN, QoS,
> T-1, PRI, Frame Relay, Linux, and network design. Based near
> Birmingham, AL. Now accepting clients worldwide.

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