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<p>The false positive rate for the DTMF decoder in spandsp is
extremely low. Tests show it has one of the lowest false positive
rates in the industry. If you are seeing significant false
positives you might actually have some DTMF in the audio. Can you
capture some troublesome audio to a file for analysis?</p>
<p>Regards,</p>
<p>Steve<br>
</p>
<div class="moz-cite-prefix">On 01/29/2018 02:35 PM, Roman Dissauer
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:57951C1A-1F3E-487E-8CFA-EBF633CCF1FC@dissauer.net">
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Hi Guys,
<div class=""><br class="">
</div>
<div class="">we have troubles reliably recognizing DTMF tones by
using dialplan application start_dtmf.</div>
<div class="">From our carriers we get some calls with inband DTMF
and some with RFC2833. To our customers we need to always do
RFC2833. Therefore we check SDP information and enable
start_dtmf when RFC2833 is not available on the incoming call.
When start_dtmf is executed we have a lot of false positives
mostly at the start of audio but also during the call.</div>
<div class=""><br class="">
</div>
<div class="">Is there a way to prevent false DTMF detection? Does
anyone have same issues and a solution for it?</div>
<div class=""><br class="">
</div>
<div class="">Kind regards<br class="">
<div class="">
<div>Roman Dissauer</div>
<div><br class="">
</div>
<div>
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