[Freeswitch-users] Need Less CPU Intensive Way to Detect Voicemail and Answering Machines

[curriegrad2004]

Since an answering machine creates a tone, have you looked into
mod_spandsp's tone_detect feature? I think it does what you want it to do.
On 2012-01-09 3:50 AM, "Avi Marcus" <avi at avimarcus.net> wrote:

> Yes, even with no other way of making it work more efficiently... 1
> machine can handle 50 calls that have actually picked up, before
> sending it to the recording.
> So your actual window is maximum 30? seconds per calls that picks up
> that mod_avmd needs to be running. So then that's 50 per 30 second
> windows so 100 calls per minute. That's 1,000 actual connected calls
> within 10 minutes. Is that within your threshold? For using ONE
> machine?
> (What happens if a person picks up? On silence it just starts the
> recording..? Or do you just have a looping first 30 seconds so it's ok
> if they miss the start?)
>
> -Avi
>
>
> On Mon, Jan 9, 2012 at 12:06 PM, Anita Hall <anita.hall at simmortel.com>
> wrote:
> > Hi David
> >
> > Question: Do you want to use only 1 machine for doing AMD on 1k+ calls ?
> If
> > not, you can distribute the load between 2 or more machines.
> >
> > Have you tried this? (from Wiki)
> >
> > For best results in getting accurate detection as well a saving system
> > resources (CPU & memory), you should do the following:
> >
> > Wait until AFTER the call has been answered before starting AVMD. In many
> > cases you may find it best to wait a few seconds after the call is
> answered
> > before starting AVMD.
> >
> > Starting AVMD before the call is answered will often result in false
> beeps
> > and wastes CPU resources.
> >
> > Once you have received the AVMD event, you should explicitly stop AVMD,
> even
> > though it will not return another event.
> >
> >
> >
> > regards,
> > Anita
> >
> >
> >
> > On Sun, Jan 8, 2012 at 7:20 AM, David Stein <dstein at ieee.org> wrote:
> >>
> >> Hello.
> >>
> >> I need to detect answering machine beeps on 1,000+ channels
> >> simultaneously.  Unfortunately, this is a real requirement, not a
> >> pseudo-requirement that can be engineered away.  This is for a mass
> >> emergency notification system for government, K-12, and higher
> education..
> >>
> >> In the past, I have done this with proprietary hardware (Dialogic and
> >> Aculab), which handles this sort of thing without overloading the host
> CPU,
> >> as the hardware's DSPs handle the detections.  I want to see if I can
> do the
> >> same thing with FreeSWITCH.
> >>
> >> Alas, I find the following warning in the wiki page for mod_avmd:
> >>
> >> AVMD (and VMD) are both very CPU intensive. You need to be aware of this
> >> fact when using it. It will drastically reduce your call capacity if
> you do
> >> not manage it correctly. On the other hand it is a very useful tool,
> and if
> >> managed properly will be a great aid for calls needing to do Voice Mail
> >> Detection.
> >>
> >>     Eric states, "You can expect about ~50 simultaneous instances on an
> >> Intel i7 920 CPU."
> >>
> >> So, it sounds like VMD and AVMD won't work for what I need to do.  I
> also
> >> don't think that the tone_detect application will work, as this requires
> >> specific frequencies (as opposed to ranges of frequencies), and
> answering
> >> machines and voicemail come with beeps at all sorts of frequencies.
> >>
> >> Does anyone know anything, either free or commercial, that I can use
> with
> >> FreeSWITCH to do this many simultaneous detections?  I know of
> commercial
> >> software-only platforms (e.g., Aculab's  Prosody S) that claim to be
> able to
> >> this, so it seems like it should be possible.
> >>
> >> Thanks in advance,
> >> David Stein
> >>
> >>
> >>
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