[Freeswitch-users] Remove inband DTMF on record_session

[Matt Broad]

Hi,

sorry to interject into your message, but I was looking to do something
similar to Tamas.

I have the need to prevent the DTMF from being recorded when using
record_session. I am using RFC2833 (i think :) ), is this at all possible
in the current Freeswitch build?

Matt


On 21 January 2013 07:25, Tamas Jalsovszky <jalsot at gmail.com> wrote:

> 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
>>
>> Sangoma Technologies
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