https://sillycodes.com/asterisk-answering-machine-detection-amd-configuration/

Asterisk Answering Machine Detection configuration :

Asterisk Answering Machine Detection Dialplan logic, Let’s you differentiate between the real Human and the Machine, Like Voicemail box. There are few situation in call center applicationswhere we want to transfer the call to Agent only if the real person answers the call, This logic is called Live Person Detection.

Here is the Asterisk Dialplan logic to detect between the Answering Machine and Human. It’s work pretty well for many cases.

extension.conf

Note : background(silence/1)  is very important here.

amd.conf

Sample Output: