On Mon, Jan 9, 2012 at 10:48 AM, Michael Collins <msc@freeswitch.org> wrote:

FWIW,

When experimenting with outbound voice broadcasting and trying to detect SIT tones, I stumbled across a factoid that might help, depending on your locale. In North America, whenever I hit an answering machine or a cell phone voicemail system the beep almost always was detected by my SIT tone detects. It was a total accident that I even found it. IIRC, the 1776.7 Hz tone was the one that almost always detected an answering machine/voicemail beep.

No guarantees that it will work, but it's probably worth investigating. If it handles 90% or more of your targets then it's at least as good as any other type of detection you'll find.

-MC

On Mon, Jan 9, 2012 at 7:26 AM, Ken Rice <krice@freeswitch.org> wrote:

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@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@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@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@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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