[Freeswitch-users] Skypiax: not able to detect "Inband" dtmf tones from pstn call?

[Scott Torr]

Yes,
I noticed the Jira for the situation where the where the fs controlled
skype client generates both an In Band audible DTMF tone and an API
signal causing potential confusion for devices down the line. If only
the skype client had an option not the generate the tone in the first
place that would be good, but then I guess they (skype) think the client
would only be an end device ;-)

However that is not where I'm having a problem, as I'm purely dealing
with 'In band' DTMF tones.

The question I had on my mind was did the Skype codec faithfully
transport the DTMF tones across the network?

http://fs.torr.letterboxes.org/dtmf_compare.html

>From these comparisons I would have to say that there in no major
filtering or distortion of the DTMF tones when transmitted across the
Skype network.

So I would have to say that "you can receive calls from skypeIN with
inband dtmfs".


If someone has a different conclusion please let me know.

regards,
Scott Torr


On Tue, 22 Dec 2009 16:25 +0100, "Giovanni Maruzzelli"
<gmaruzz at celliax.org> wrote:
> It is probably because mod_skypiax does not analize incoming audio
> looking for dtmf, because the "normal" call from a Skype client peer
> sends *both* inband and out of band (signaling) dtmf.
> 
> So, I choose to only detect out of band (signaling) dtmfs, and ignore
> possible inband dtmfs (in the audio flow), so to have the most
> reliable source (signaling) and spare cpu (not analizing the incoming
> audio).
> 
> Never tought you can receive calls from skypeIN with inband dtmfs...
> 
> Open a Jira for this, I'll think about.
> 
> Also, let me know your toughts...
> 
> -giovanni
> 
> 
> 
> 
> On Tue, Dec 22, 2009 at 3:57 PM, Scott Torr
> <scott.torr.fs at letterboxes.org> wrote:
> > ubuntu-8.04.3-server-amd64.iso (update/upgrade)
> > FreeSWITCH Version 1.0.trunk (15787)
> > skype-ubuntu-intrepid_2.1.0.47-1_amd64.deb
> > mod_skypiax
> >
> > (POTS)-->(PSTN)-->(skypeIN)-->(skype_client)-->(skypiax)-->(fs)
> >
> > <extension name="Indial_to_fs_via_skypeIN">
> >  <condition field="destination_number" expression="^501$">
> >    <action application="start_dtmf" />
> >    <action application="record_session"
> >    data="/root/recordings/${strftime(%Y-%m-%d-%H-%M-%S)}_${destination_number}_${caller_id_number}.wav"/>
> >    <action application="playback" data="/root/Hello_16000.wav" />
> >  </condition>
> > </extension>
> >
> >
> > fs>console loglevel 7
> >
> >
> > If I dial 501 from from a sip phone using "inband" dtmf I can see the
> > dtmf tones being detected and decoded by fs in the debug log.
> >
> >
> > If however I use a pstn phone and dial my skypeIN telephone number the
> > call comes into fs via skypiax but when I generate dtmf tones on the
> > phone they are not detected or decoded by fs.
> >
> > If I take the record_session file and spectrum analyze the recorded
> > tones appear to be within spec.
> >
> >
> > Can anybody suggest why this is not working for me?
> >
> >
> > Is the correct sample rate being used in libteletone_detect.c?
> > Does the Goertzel algorithm work for other sample rates other than
> > 8000hz?
> >
> >
> > I'm not sure why I can not get this to work?
> >
> >
> >
> > regards,
> > Scott Torr
> >
> >
> >
> >
> >
> > _______________________________________________
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> >
> 
> 
> 
> -- 
> Sincerely,
> 
> Giovanni Maruzzelli
> Cell : +39-347-2665618
> 
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