FWIW,<div><br></div><div>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. </div>
<div><br></div><div>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.</div>
<div><br></div><div>-MC<br><br><div class="gmail_quote">On Mon, Jan 9, 2012 at 7:26 AM, Ken Rice <span dir="ltr"><<a href="mailto:krice@freeswitch.org">krice@freeswitch.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<font face="Monaco, Courier New"><span style="font-size:11pt">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<span class="HOEnZb"><font color="#888888"><br>
<br>
K</font></span><div><div class="h5"><br>
<br>
<br>
On 1/9/12 9:22 AM, "curriegrad2004" <<a href="http://curriegrad2004@gmail.com" target="_blank">curriegrad2004@gmail.com</a>> wrote:<br>
<br>
</div></div></span></font><blockquote><div><div class="h5"><font face="Monaco, Courier New"><span style="font-size:11pt">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.<br>
<br>
On 2012-01-09 3:50 AM, "Avi Marcus" <<a href="http://avi@avimarcus.net" target="_blank">avi@avimarcus.net</a>> wrote:<br>
</span></font><blockquote><font face="Monaco, Courier New"><span style="font-size:11pt">Yes, even with no other way of making it work more efficiently... 1<br>
machine can handle 50 calls that have actually picked up, before<br>
sending it to the recording.<br>
So your actual window is maximum 30? seconds per calls that picks up<br>
that mod_avmd needs to be running. So then that's 50 per 30 second<br>
windows so 100 calls per minute. That's 1,000 actual connected calls<br>
within 10 minutes. Is that within your threshold? For using ONE<br>
machine?<br>
(What happens if a person picks up? On silence it just starts the<br>
recording..? Or do you just have a looping first 30 seconds so it's ok<br>
if they miss the start?)<br>
<br>
-Avi<br>
<br>
<br>
On Mon, Jan 9, 2012 at 12:06 PM, Anita Hall <<a href="http://anita.hall@simmortel.com" target="_blank">anita.hall@simmortel.com</a>> wrote:<br>
> Hi David<br>
><br>
> Question: Do you want to use only 1 machine for doing AMD on 1k+ calls ? If<br>
> not, you can distribute the load between 2 or more machines.<br>
><br>
> Have you tried this? (from Wiki)<br>
><br>
> For best results in getting accurate detection as well a saving system<br>
> resources (CPU & memory), you should do the following:<br>
><br>
> Wait until AFTER the call has been answered before starting AVMD. In many<br>
> cases you may find it best to wait a few seconds after the call is answered<br>
> before starting AVMD.<br>
><br>
> Starting AVMD before the call is answered will often result in false beeps<br>
> and wastes CPU resources.<br>
><br>
> Once you have received the AVMD event, you should explicitly stop AVMD, even<br>
> though it will not return another event.<br>
><br>
><br>
><br>
> regards,<br>
> Anita<br>
><br>
><br>
><br>
> On Sun, Jan 8, 2012 at 7:20 AM, David Stein <<a href="http://dstein@ieee.org" target="_blank">dstein@ieee.org</a>> wrote:<br>
>><br>
>> Hello.<br>
>><br>
>> I need to detect answering machine beeps on 1,000+ channels<br>
>> simultaneously. Unfortunately, this is a real requirement, not a<br>
>> pseudo-requirement that can be engineered away. This is for a mass<br>
>> emergency notification system for government, K-12, and higher education..<br>
>><br>
>> In the past, I have done this with proprietary hardware (Dialogic and<br>
>> Aculab), which handles this sort of thing without overloading the host CPU,<br>
>> as the hardware's DSPs handle the detections. I want to see if I can do the<br>
>> same thing with FreeSWITCH.<br>
>><br>
>> Alas, I find the following warning in the wiki page for mod_avmd:<br>
>><br>
>> AVMD (and VMD) are both very CPU intensive. You need to be aware of this<br>
>> fact when using it. It will drastically reduce your call capacity if you do<br>
>> not manage it correctly. On the other hand it is a very useful tool, and if<br>
>> managed properly will be a great aid for calls needing to do Voice Mail<br>
>> Detection.<br>
>><br>
>> Eric states, "You can expect about ~50 simultaneous instances on an<br>
>> Intel i7 920 CPU."<br>
>><br>
>> So, it sounds like VMD and AVMD won't work for what I need to do. I also<br>
>> don't think that the tone_detect application will work, as this requires<br>
>> specific frequencies (as opposed to ranges of frequencies), and answering<br>
>> machines and voicemail come with beeps at all sorts of frequencies.<br>
>><br>
>> Does anyone know anything, either free or commercial, that I can use with<br>
>> FreeSWITCH to do this many simultaneous detections? I know of commercial<br>
>> software-only platforms (e.g., Aculab's Prosody S) that claim to be able to<br>
>> this, so it seems like it should be possible.<br>
>><br>
>> Thanks in advance,<br>
>> David Stein<br>
>><br>
>><br>
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