Answering Machine Detection

From Taridium

This application attempts to detect answering machines at the beginning of outbound calls. It is used in a variety of ipbx application to detect answering machines. AMD settings can be configured in the Administrator Panel under Configuration → Manual Editor → Answering Machine Detection

Parameters

Time values are all in milliseconds unless stated otherwise.

• initialSilence is the maximum silence duration before the greeting. If exceeded then MACHINE.
• greeting is the maximum length of a greeting. If exceeded then MACHINE.
• afterGreetingSilence is the silence after detecting a greeting. If exceeded then HUMAN.
• totalAnalysisTime is the maximum time allowed for the algorithm to decide on a HUMAN or MACHINE.
• minimumWordLength is the minimum duration of Voice to considered as a word.
• betweenWordsSilence is the minimum duration of silence after a word to considere the audio what follows as a new word.
• maximumNumberOfWords is the maximum number of words in the greeting. If exceeded then MACHINE.
• silenceThreshold is the silence threshold.

Example AMD Configuration

 [AMD] 
 initial_silence = 2500 
 greeting = 1500 
 after_greeting_silence = 300 
 total_analysis_time = 4000 
 min_word_length = 120 
 between_words_silence = 50 
 maximum_number_of_words = 5 
 silence_threshold = 256