[Asterisk-Users] Buzzing on TDM400P FXS?

[Jonathan Biggs]

Had a similar problem

What kind of phone are you using on that line?

My case, the line was sharing a Palm modem on it.
Electrical noise from the power strip was causing the
problem.

Also when My cell phone was too close to the phone,
same problem

Also found the VMWI logic was not working well with
the PALM modem and took the mailbox off that line





--- Scott Laird <scott at sigkill.org> wrote:
> I have an intermittent problem with the one FXS line
> that I have.  On 
> most calls, the first ~5 seconds of the call has a
> loud buzzing noise 
> on the line.  After 5 seconds or so, it fades off to
> nothing, and the 
> sound quality is great.  Searching for "buzzing" on
> the list doesn't 
> give a whole lot to work with.  The buzzing happens
> on calls that are 
> routed over both my FXO line and IAX to NuFone, so
> I'm pretty sure that 
> it's happening on the FXS end.
> 
> Here's that chunk of zapata.conf:
> 
>   context=inside-analog
>   signalling=fxo_ks
>   callwaiting=yes
>   callwaitingcallerid=yes
>   cancallforward=yes
>   callreturn=yes
>   threewaycalling=yes
>   transfer=yes
>   echocancel=yes
>   echocancelwhenbridged=yes
>   relaxdtmf=yes
>   rxgain=1.5
>   txgain=0
>   immediate=no
>   musiconhold=yes
>   usecallerid=yes
>   callerid="Analog Phone" <2201>
>   mailbox=2201
>   channel => 2
> 
> Does anyone have any suggestions on where to start
> looking?
> 
> 
> Scott
> 
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