[Freeswitch-users] skypiax dtmf detection issue on Freeswitch

[Scott Torr]

Hi Majdi,

It is good to know that once the audio stream is in the right 'format',
Freeswitch is able to decode the DTMF's to digits. (as best it can given
the potential jitter and lossy quality of the signal)

I'm sure someone on the list has the answer and it will quite simple.

So here we go:


How do we convert the audio stream from mod_skypiax into to a suitable
format that <action application="start_dtmf" /> can attempt to decode
the 'Inband' DTMF tones into digits?

At present it seems that the decoder will not work on a 16Kbps stream.


Perhaps this has been explained and not understood?

Ideally Skype would decode the DTMF tones ingress to the Skype network
at the PSTN-Skype gateway and pass on as out of band signaling. Either
through bad design or intentionally they do not. It seems though at some
locations (New Zealand) they did, then did not?

Perhaps on their paid for (approx $9 AUD per month) SIP trunks they do?
Or is this just as hit and miss as well?
Does any body have any experience with those?


-Scott

On Wed, 03 Feb 2010 20:42 -0600, "BSOUL Majdi"
<Majdi.Bsoul at alcatel-lucent.com> wrote:
> I just saw your JIRA, so definitely by your comment date so close you
> might still blocked on that resolution.
> 
>  
> 
> I used SiptoSis with a single channel and because it passes the stream
> to Freeswitch as PCMU, it allows FS to detect correctly. And this proves
> that the inband DTMF quality coming from Skype is good enough.
> 
>  
> 
> I am trying to see if I can use stsTrunkBuilder to support multiple
> interfaces, but looks that it requires different skype account for each
> instance, rather than allowing me to use single instance for all
> instances as skypiax does.
> 
>  
> 
> Regards,
> 
>  
> 
> Majdi Bsoul
> 
> Mobile NGN R&D
> 
> Alcatel-Lucent
> 
> 3400 W. Plano Parkway
> 
> M/S 601-NGNRD
> 
> Plano, TX 75075  
> 
> Office: +1 972 477 0065
> 
> Fax: +1 972 519 3600
> Email: majdi.bsoul at alcatel-lucent.com
> 
> From: BSOUL Majdi 
> Sent: Wednesday, February 03, 2010 8:26 PM
> To: 'scott.torr.fs at letterboxes.org'
> Cc: 'mbsoul at hotmail.com'
> Subject: skypiax dtmf detection issue on Freeswitch
> 
>  
> 
> Hello Scott,
> 
>  
> 
> I thought I catch up with you and see if you had found a solution for
> the skypiax dtmf detection in FS issue that you reported in Dec?
> 
> I am running with the same issue.
> 
>  
> 
> Thanks,
> 
>  
> 
> Majdi Bsoul
> 
> Mobile NGN R&D
> 
> Alcatel-Lucent
> 
> 3400 W. Plano Parkway
> 
> M/S 601-NGNRD
> 
> Plano, TX 75075  
> 
> Office: +1 972 477 0065
> 
> Fax: +1 972 519 3600
> Email: majdi.bsoul at alcatel-lucent.com
>