[asterisk-users] Really bad phone line.. possible causes?

Mojo with Horan & Company, LLC mojo at horanappraisals.com
Wed Sep 6 12:27:37 MST 2006

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
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Mojo <mojo at horanappraisals.com>
Office Manager, Horan & Company, LLC
(907) 747-6666 x112

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