[asterisk-users] PSTN Calls from SI.P: buzzing and pops

[Tzafrir Cohen]

On Fri, Feb 16, 2007 at 12:39:54AM -0500, Allen Casteran wrote:
> We have SIP phones connecting to *, and our PSTN lines connecting 
> through an Astribank FXO.
> 
> Internal Sip<->SIP calls are clear.
> External calls through the Astribank get occassional low level buzzing 
> for about 1/2 - 1 sec at a time.
> 
> Those are usually accompanied by some light pops or static
> 
> No transcoding, all ulaw.
> PSTN lines come from an Adtran IAD channel bank about 10 ft of cable 
> from the Astribak. Astribank and Adtran are both chassis grounded to our 
>  UPS.
> 
> Tried set echocancel=on and echocancel=off in the zapata.conf... No 
> difference.

You mentioned (in another mail) that if you connect the same line to the
PSTN the line is clear. Was it in the same setup or were there some
resets and/or reconfigurations in the process?

If you connect a simple phone insted of the Astribank, do yu have the
same problems?

-- 
               Tzafrir Cohen       
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