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

[Ken Rice]

Detecting the tone is exactly what mod_vmd and mod_avmd do now... Not
exactly the most efficient way to detect this sort of thing, but it does
work

K


On 1/9/12 9:22 AM, "curriegrad2004" <curriegrad2004 at gmail.com> wrote:

> 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
>>>> >>
>>>> >>
>>>> >> 
>>>> _________________________________________________________________________
>>>> >> Professional FreeSWITCH Consulting Services:
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>>>> >> http://www.freeswitchsolutions.com
>>>> >>
>>>> >> 
>>>> >> 
>>>> >>
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>>>> >>
>>> >
>>> >
>>> > _________________________________________________________________________
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>>> >
>>> > 
>>> > 
>>> >
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>> 
>> _________________________________________________________________________
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>> 
>> 
>> 
>> 
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> 
> 
> _________________________________________________________________________
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> 
> 
> 
> 
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