Hi David<br><br>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. <br><br>Have you tried this? (from Wiki)<br><p>For best results in getting accurate detection as well a saving
system resources (CPU & memory), you should do the following:
</p>
<ul><li> 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.
<ul><li> Starting AVMD before the call is answered will often result in false beeps and wastes CPU resources.
</li></ul>
</li><li> Once you have received the AVMD event, you should explicitly stop AVMD, even though it will not return another event.
</li></ul><br clear="all"><br>regards,<br>Anita<br><br>
<br><br><div class="gmail_quote">On Sun, Jan 8, 2012 at 7:20 AM, David Stein <span dir="ltr"><<a href="mailto:dstein@ieee.org">dstein@ieee.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Hello. <br>
<br>
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. <br>
<br>
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. <br>
<br>
Alas, I find the following warning in the wiki page for mod_avmd: <br>
<blockquote>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.<br>
<br>
Eric states, "You can expect about ~50 simultaneous instances
on an Intel i7 920 CPU." <br>
</blockquote>
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. <br>
<br>
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. <br>
<br>
Thanks in advance, <br><span class="HOEnZb"><font color="#888888">
David Stein<br>
<br>
</font></span></div>
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