Answering machine
detection FAQ.

AMD is the step where an outbound dialer decides, right after a call is answered, whether a live person or a machine picked up. Live people go to agents; voicemail, carrier messages and fax tones are dropped or handled by your voicemail rules.

A false positive is a live person who is classified as a machine. The dialer hangs up or plays a voicemail message to them, the lead is burned, and your number gains a reputation for silent calls.

Built-in AMD in Asterisk (and so ViciDial and GoAutoDial) times silences and word lengths. A hesitant “Hello?” followed by a pause looks like a recording, and a short personal greeting can look like a person.

AMDY listens to the acoustic signature of the first moments of the answer — breath, room sound, the rhythm of a real hello — rather than counting pauses. Fixed tones like busy, SIT, fax and ringback are recognised before the model is asked.

Detection begins about 125 ms after answer, and most calls are classified well inside the window a typical AMD setting already uses, so agents don’t inherit extra dead air.

HUMAN, MACHINE, and supporting causes such as SCREENING, TONE and SILENCE. FALLBACK means AMDY did not judge the call and your native AMD should take over.

Yes. Handset screening assistants answer like a person but are machines. AMDY reports them separately so you decide how they are handled.

ViciDial and GoAutoDial, any Asterisk 13+ dialplan, FreeSWITCH (including FusionPBX) and anything else that can stream 8 kHz mono audio over a WebSocket.

No. AMDY listens to the audio your dialer server already has, so it works with any SIP trunk. Your routing and carriers stay as they are.

The client marks the call as FALLBACK before any audio is used, and your dialplan runs its native AMD. No call is lost, and fallback calls aren’t billed.

Only the short audio window used to classify a call, and only if you keep recording enabled. You control retention and can delete recordings at any time.

Yes. Sandbox includes 50,000 free detections with no card and a hard cap, so it can never produce a bill.

Yes. The partner program runs the detection endpoint and dashboard on your domain with your branding.