[Asterisk-Users] Buzzing on TDM400P FXS?

[Scott Laird]

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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