[Asterisk-Users] Hiss

[Paul]

Jeffrey Macko wrote:

> Whoo Hoo! I managed to get * up and running last night.
>
> My most pressing problem is that there is a considerable amount of 
> hiss heard by the called party when using a SIP phone (xten or 
> GXP-2000). I’ve tried two different computers with two different 
> headsets, and the hiss still remains when you should be hearing 
> silence (or near silence).
>
> The hiss does not occur when you’re on one of the extensions of the 
> legacy PBX (Nortel).
>
> Anyone have some ideas on where I should be looking?
>
>
> Basics below:
>
> PSTN (via PRI) à * à PRI à Nortel Meridian
>
> I’ve got a basic dial plan setup to forward most calls through * to 
> the legacy PBX.
>
> Thanks!
>
> --Jeffrey
>
I test headsets by doing record/playback with audacity sound editor on a 
linux workstation. So far all of them have high frequency hiss and 
noise. I record and then apply a low pass filter and the playback sounds 
fine. When I have the time I will be testing some usb headsets.

I get the hiss and noise with softphones using all headsets I have tried 
so far. I don't get it with grandstream budgetone 101 phones or phones 
connected to ata's.