Justin Sherrill wrote:
> We occasionally get a sort of feedback/echo noise on our phones
> here. (Polycom IP550 / Asterisk 1.8). It lasts for about a second,
> and it's described by users as 'jingle bells'.
That's very appropriate for the season. I just hope they're not
Todash Chimes. ; )
> It happens when people are using the speakerphone, especially when
> it's on both ends. It happens on internal calls, so it's not
> something from the PSTN.
>
> My theory is that the very sensitive speakerphone microphones in
> those models are picking up small noises, and then picking up their
> own playback of the noise, which leads to the feedback sound. It
> repeats, which is why it sounds like an echo.
Your theory sounds correct to me. You've described acoustic echo and
that is the most prevalent type for internal VoIP calls.
> I think turning rxgain/txgain down may make a difference, but I
> haven't tried it yet. Has anyone else experienced something
> similar?
I believe rxgain and txgain only apply to DAHDI channels. The first
thing I would try is reducing the speakerphone volume settings on the
Polycom IP550s.
Regards,
Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer
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