How to Reduce VICIdial AMD False Positives from 20% to Under 5%

If you run a VICIdial outbound call center, you already know the pain of answering machine detection gone wrong. A live prospect picks up, says "Hello?" and your AMD algorithm decides it heard a voicemail greeting. The call gets dropped or sent to a message queue. That prospect never gets a callback. At scale -- say 50 agents making 200+ dials per hour -- a 20% false positive rate on AMD means you are burning through 40 live connections every single hour. Over an 8-hour shift, that is 320 lost conversations per day. At even a modest $5 revenue per live connection, you are leaving $1,600 on the table daily. This guide walks through the exact AMD parameters inside VICIdial and Asterisk, how to tune them per carrier, how to build adaptive thresholds, and how to validate your changes with real recordings. We have applied this methodology across more than 100 VICIdial call centers, and consistently bring false positive rates from the 15-25% range down to 3-5%. Understanding How VICIdial AMD