[Freeswitch-users] start_dtmf false positives

[Steve Underwood]

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?

Regards,

Steve

On 01/29/2018 02:35 PM, Roman Dissauer wrote:
> Hi Guys,
>
> we have troubles reliably recognizing DTMF tones by using dialplan 
> application start_dtmf.
> 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.
>
> Is there a way to prevent false DTMF detection? Does anyone have same 
> issues and a solution for it?
>
> Kind regards
> Roman Dissauer
>
> *RDI SOLUTIONS e.U.*
> Rosasgasse 13/24
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> *www.rdi.at <http://www.rdi.at>*
> *
> *
>
>
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