[Freeswitch-users] Remove inband DTMF on record_session

[Tamas Jalsovszky]

Hello Moy,

Inserting silence instead of the tone would be fine for me. I think the >=
50ms delay in recording is not an issue. I guess, removing from "live"
streams would be harder and would introduce the delay you mentioned.
So you have a plan to add such a functionality in the near future? That
would be amazing :)

Regards,
  Jalsot

On Mon, Jan 21, 2013 at 2:48 AM, Moises Silva <moises.silva at gmail.com>wrote:

> On Sun, Jan 20, 2013 at 4:12 PM, Tamas Jalsovszky <jalsot at gmail.com>wrote:
>
>> Hello,
>>
>> Is there a way to to remove inbad DTMF from the recorded wav file
>> (conditionaly)?
>> If not, how could be that done the easyiest way and a way it could get
>> into FS git?
>>
>> As FS has a great DTMF detector and it has probably all the stuff doing
>> such a feature, I think it would be much better than using an external tool
>> for removing DTMF from finished wav file - and it would consume more I/O
>> probably.
>>
>>
> Removing it would not be that hard (ie, inserting silence instead).
> Removing it without leaving a trace any DTMF was ever there sounds a tad
> more difficult. If you're ok with inserting a silence instead of the tone,
> extending the record_session app to detect and remove DTMF is probably what
> I'd do.
>
> It is also possible to create a new app that monitors the audio stream and
> silence the stream when DTMF is detected, but since the detection takes a
> few milliseconds (~50ms), there would be a bit of "bleeding" of DTMF in the
> signal, unless the new app also delays the signal by 50ms and then has a
> way to strip the DTMF completely.
>
> *Moises Silva
> **Manager, Software Engineering***
>
> msilva at sangoma.com
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