[asterisk-users] Answer Machine detection

[Matt Florell]

We use app_amd in the VICIDIAL project and it works fairly well(better
than 60% if you tune it right), although I still don't recommend that
anyone use Answering Machine detection.
http://bugs.digium.com/view.php?id=5959

When we usually do automated notification campaigns we will most often
wait 2 seconds from Answer and then play the message twice(depending
on it's length). This gets the message on close to 100% of the
answering machine/voicemail even if it starts in the middle of the
first play it is played again and we have had rather good response
from this.

MATT---

On 9/6/06, Mark Ackroyd <mark.ackroyd at cencion.com> wrote:
> I use Asterisk mainly in the IVR world and sometimes do a few outbound based
> campaigns. The horrible subject of Answer Machine Detection as lifted its
> head again. To my knowledge there are 3 ways to deal with it.
>
> 1) When the call is answered, you please a message something like "There is
>    an important message for you please press 1" and you detect the
>    Live/Machine state from that.
>
> 2) You listen for the "Hello?" using backgrounddetect then a pause. If there
>
>    is little or no pause assume it's an answer machine else it's a live
>
> 3) You listen for the tone or beep given off by the answer machine at the
>    end of the announcement.
>
>
> At the moment prefer 1, it's easy and quick to implement.  Using method 2 is
> tricky you need to play with various settings and I only usually get a 60%
> success rate with it.  Option 3, I have never seen an asterisk based
> solution for this one, or know that they exist.
>
> Does anyone have any snippets or even a commercial solution to get option 2
> success rate to the 90% mark? or anyone know of some that has an asterisk
> solution for option 3?.  Failing that is there an option 4 or 5?
>
> Thanks,
> Mark
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