[Freeswitch-users] Remove inband DTMF on record_session

[Matt Broad]

Thanks for the response Steve, is there a way of checking the dtmf type? I
have tried looking at the Sofia profile but cannot see any details
regarding dtmf.

 I assume that this is determined by my sip provider?


Thanks
Matt

On Friday, 25 January 2013, Steven Ayre wrote:

> If you're using RFC2833 then that's not in the audio itself so won't be
> recorded. It is possible though that the caller is ending DTMF both in and
> out of band (which is fine as long as you only try to detect one or the
> other but not both).
>
> -Steve
>
>
>
> On 25 January 2013 14:27, Matt Broad <matt at inveroak.com> wrote:
>
> 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
>
> 100 Renfrew Drive, Suite 100, Markham, ON L3R 9R6 Canada
>
>

-- 
Thanks
Matt

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