asterisk users - Sep 2006 - Really bad phone line.. possible causes?

Hi,

I was wondering if those more familiar with PSTN->Asterisk installs
could take a listen to this (86k recording):

http://confluence.atlassian.com/download/attachments/185668/linegoingbad.mp3?version=1

It's what I hear dialling into our Asterisk box. As soon as the call
receiver makes a sound (clicking fingers in that recording), the line
makes a brief buzzing noise, then goes crazy with raw static.

There is a longer recording and configuration info at:

http://confluence.atlassian.com/display/TEST/Asterisk+phoneline+samples

The odd thing is, we have two phonelines, and the connection quality of
the second line coming into Asterisk is perfect.

Our Asterisk box is hooked up (in parallel with a NEC PBX) to our public
phone line via a TDM404P card.

Does this ring any bells for anyone?


Thanks,
Jeff

What codec are your sip phones using?  We'd have a similar, though 
immediate, degradation in audio quality using G.729 when zaptel was 
built with MMX optimizations.  We use an AMD CPU.

When zaptel was rebuilt without MMX optimizations we were back in business.

Jeff Turner wrote:
> Hi,
> 
> I was wondering if those more familiar with PSTN->Asterisk installs
> could take a listen to this (86k recording):
> 
>
http://confluence.atlassian.com/download/attachments/185668/linegoingbad.mp3?version=1
> 
> It's what I hear dialling into our Asterisk box. As soon as the call
> receiver makes a sound (clicking fingers in that recording), the line
> makes a brief buzzing noise, then goes crazy with raw static.
> 
> There is a longer recording and configuration info at:
> 
> http://confluence.atlassian.com/display/TEST/Asterisk+phoneline+samples
> 
> The odd thing is, we have two phonelines, and the connection quality of
> the second line coming into Asterisk is perfect.
> 
> Our Asterisk box is hooked up (in parallel with a NEC PBX) to our public
> phone line via a TDM404P card.
> 
> Does this ring any bells for anyone?
> 
> 
> Thanks,
> Jeff
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
> 
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
> 
> !DSPAM:500,44fe5161224541822916521!
> 
-- 
Mojo <mojo@horanappraisals.com>
Office Manager, Horan & Company, LLC
(907) 747-6666 x112