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[Shishir.Pokharel at on...]

You might be able to do it by asterisk AMD, but personally I haven’t used it on fax detection..

http://www.voip-info.org/wiki/view/Asterisk+cmd+AMD

From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Tech Support
Sent: Friday, August 08, 2014 10:57 AM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: [asterisk-users] How to tell the diff. between a fax and an audio call on outbound calls



All;
I have a customer who does some small, limited fax broadcasting. What he wants to do is to be able to tell when a phone number is actually a human rather than a fax machine so he can delete the number from his customer list. Determining whether a call is a fax or not on the incoming is easy, but I’m not quite sure how to do that with an outbound call. Any insight at all would be greatly appreciated. On a related note, is it possible to tell if an outbound call to a phone number is disconnected?
Thanks;
John V.