Hi,

thanks Alexey, but spandsp_start_dtmf uses exactly same libteletone under the hood.

Kind Regards,

Roman

RDI SOLUTIONS e.U.

Rosasgasse 13/24

1120 Wien, Österreich

T: +43 1 3530349 - 10

F: +43 1 3530349 - 99

roman.dissauer@rdi.at

www.rdi.at

Am 30.01.2018 um 00:06 schrieb Alexey Sibyakin <alex@freeswitch.com>:

Have you tried spandsp_start_dtmf? It has its quirks but after some tuning It worked for me much better than start_dtmf.

On Tue, Jan 30, 2018 at 1:15 AM, Steve Underwood <coppice12@gmail.com> wrote:

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

1120 Wien, Österreich

T: +43 1 3530349 - 10

F: +43 1 3530349 - 99

roman.dissauer@rdi.at

www.rdi.at

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