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

[Anita Hall]

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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