[Asterisk-Users] Sipura-SPA2000 background noise

[Kevin Walsh]

Tony Hoyle [tmh at nodomain.org] wrote:
> lists at idontknow.com wrote:
> > I hear the exact same noise on 2 units I purchased a few months ago.
> > 
> > I've been in contact with sipura support and they are willing to try
> > RMA'ing one of my units. As soon as I can get to the site with the
> > sipura, I'll be sending it in. 
> > 
> > I'll post my results to the list.
> > 
> > btw, I'd have to agree that its not comfort noise, its very similar
> > (only much louder) to the "hiss" that the old digium fxs modules had on
> > the tdm boards. 
> > 
> Did you manage to resolve this?  It's really annoying, and is a constant
> hiss even when making PBX-only calls (eg. '123' for the time, which is
> executed entirely by the dialplan).
> 
> I tried tweaking some of the 'advanced' options and didn't get
> anywhere... if there's no solution I'll just RMA it.
> 
Try playing with the "FXS Port Impedance" in the "Regional" settings.
Mine is set to 600.  I imagine that a mismatch here could cause that
sort of thing.

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