[Asterisk-Users] Buzzing on TDM400P FXS?

[Ryan Courtnage]

I had slightly different problems - but the resolutions might help you:

I had a problem with an intermittent loud buzzing on my X100P (heard 
when accessing PSTN from my SIP and Zap clients).  The problem went 
away when I physically moved the card down a PCI slot (further away 
from my TDM400P and my power supply).

I also had an additional problem with jittery/choppy sound when 
receiving calls from PSTN on SIP devices.  This was due to my X100P 
sharing interrupts with other devices (e.g. NIC).

Cheers
Ryan


On 5-Apr-04, at 12:41 PM, Scott Laird 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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