[asterisk-speech-rec] SpeechBackround: accepting DTMF and speech at the same time? Why?

[Tom [toms400]]

The phone isn't purposely sending the tone down the line, it's just
loud enough that it's picked up by the engine as some sort of speech
and short enough that the speech engine stops listening and sends its
result.  I've set the vad_noise_filter as high as I can to a point
where it can still hear real speech (12000) but this feedback beep
still gets through.

I've been testing with a Uniden 900 MHz cordless.
http://www.uniden.com/products/productdetail.cfm?product=DXI986-2

Its the same behavior as using a softphone w/headset (and w/o headset)
and the speaker turned up.

On 12/4/06, Kevin P. Fleming <kpfleming at digium.com> wrote:
> Tom [toms400] wrote:
> > The problem is that some of them have phones that produce beeps
> > intended for them as audible feedback, not the person they're calling.
> > That beep is basically just background noise.  So, even though
> > SpeechBackground picks up the out-of-band DTMF correctly, the speech
> > engine appears to be detecting that beep as speech, timesout and
> > returns an incomplete result.  Does this sound plausible?
>
> The phone is sending this beep down the line, not just playing it out
> the speaker (or some other method) for the person sitting at the phone?
> That seems very odd... I've never heard of a phone that does that. When
> the keys are pressed, the only that should be sent down the line is the
> DTMF itself, not some random other noise that will be useless for the
> other party.
>
> Is the server hearing this noise because the user is using the phone in
> speakerphone mode, or with a headset with the speaker set to a high volume?
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