[Freeswitch-users] Detecting FAS?

David Villasmil david.villasmil.work at gmail.com
Mon Mar 2 14:07:02 UTC 2020

Back in the day (circa 1995) we used DSPs to detect ring tone. We’d block
the 200 until the ring back stopped and we got some _other_ audio
profile... it might be an overkill, tho.

On Mon, 2 Mar 2020 at 14:00, Avi Marcus <avi at avimarcus.net> wrote:

> I've yet again had users reporting issues and I found it there's FAS.
> I'd like to find or create something that notices and logs these issues
> immediately, before potentially weeks of customers experiencing degraded
> service. Before I re-invent the wheel, I'm asking if someone has a wheel
> around.
> I looked at these particular PCAPs and the ringing is quite clear to hear.
> Is there some scripts around that can flag calls, either based on simply
> the CDR or even with the PCAP as FAS? (e.g. FAS calls will rarely be over 2
> minutes.)
> (Although, apparently there's many types of FAS. One more is to play a
> ring tone for 10-20 seconds and THEN try to connect the call. That way they
> get at least free 20 seconds of billable time and then proceed with
> business as usual.)
> https://blog.kolmisoft.com/fraud-false-answer-supervision-fas/ mentions
> key indicators in the CDR, but this isn't enough to definitely pin it as
> FAS. This could also occur upon reaching voicemail.
>    - Short phone calls.
>    - A caller which hangs up nearly 100% of the time.
>    - High answer seizure ratio.
>    - Lower ACD.
> They also mention this, which is what I'm interested in: "RTP audio signal
> processing: detection of voice, silence or ring-back tone."
> Is there some simple way to detect ring tones in the audio playback (which
> I might have to cut to ensure it's after the billing has actually started
> if the audio ring tone was passed in band)
> Thanks,
> -Avi Marcus
> BestFone
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David Villasmil
email: david.villasmil.work at gmail.com
phone: +34669448337
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