The system's answering-machine-vs-human classification only comes back after the call has already been answered and engaged, so the agent cannot act on whether it reached a person or a machine in time.

What this is

Filed as AMD result arrives after call answered, the name every report of this mode is collected under.

A failure mode is one named thing that goes wrong on a live call. This record carries every public report of it the atlas has found, in each reporter's own words, and a status that moves only when a re-check stores the artifact behind the move. Status open: reported and still open where it was reported.

Evidence

Every independent public report of this mode, newest first: who wrote it, where, when, what they said, and the link back to the post it came from.

1. Chris Dutrowon Stack Overflow2014-09-22twilioCC BY-SA 4.0

   Answering Machine Detection (AMD) with Twilio.. But after the fact

   https://stackoverflow.com/questions/25981498/answering-machine-detection-amd-with-twilio-but-after-the-fact

   first seen 2014-09-22 · fetched 2026-07-25T17:51:26Z · body sha256 9cd2036c86d0980f

Each quote is at most 30 words around the reported failure and links to the post it came from. If you wrote one of these and want it off this page, the removal path takes it down within 24 hours.

What is measurable

Evidence tier: Atlas record: every field on this page traces to a fetched public artifact.

What it establishes

• Every report below links to the original post and names the handle that wrote it; the quote is at most 30 words around the reported failure.
• The status changes only when a re-check stores the evidence link, the quote and the date behind the change.
• Every timestamp comes from the fetched artifact it describes, recorded with the sha256 of the response body it was read from.

What your trace settles

• Reproducing the mode on your own stack is the next step: the reports below carry the configuration each reporter was running.

# the timing incidents in one recording, ranked
hotato autopsy ./call.wav

The tier above is what this record establishes on its own: linked sources, an artifact behind every status move, and timestamps that trace to a fetched response. To put a number on your own call, hotato autopsy reads a recording you already have and ranks the timing incidents in it. hotato is MIT and runs locally. getting started.

Status history

A daily re-check reads every source thread on this page. The status moves when that re-check stores the link, the quote and the date behind the move, so every state on this record is one you can open.

The record has carried one status since it opened: open, reported and still open where it was reported. A move lands here with the link, the quote and the date that show it.

Related modes

Entries this one shares evidence with. Each line names the share that put it there: a stack both were reported on, a post that named both, or the detector kind that measures both.

• AMD tone detection premature teardownopenVFA-2026-0010

  The system stops listening for the voicemail beep tone as soon as it detects silence after the greeting, so a beep arriving just after is...

  shares: reported on twilio; reported on stackexchange

• Barge-in teardown raceacknowledgedVFA-2026-0001

  When the caller interrupts the agent mid-speech, the system's interrupt handling fails to cleanly tear down the in-progress turn...

  shares: reported on twilio; reported on stackexchange

• Endpoint misdetectionacknowledgedVFA-2026-0002

  End-of-turn detection fires at the wrong moment, so the agent either answers before the caller has finished or waits after they have.

  shares: reported on twilio

• AMD premature timeout before answeropenVFA-2026-0019

  On outbound calls, the answering-machine-detection timer starts before the callee has actually answered, so ring or early media triggers a...

  shares: reported on twilio

The record

Atlas id

VFA-2014-0001

Mode id

pat_d38ab5cc91316ac1c7f78467

Content digest

sha256:d38ab5cc91316ac1c7f78467a3e32915758302dafcb69a9ddebcd5358a30781f

First reported

2014-09-22

Last reported

2014-09-22

First seen by the atlas

2014-09-22T19:12:33Z

Last re-checked

2014-09-22T19:12:33Z

Reported on

twilio

Sources

Stack Overflow

Scope

1 independent public report across 1 source. This entry states where the mode has been reported; where else it can occur is what the next report settles.

References

Every link this entry stands on: the post behind each report, and the artifact behind each status move.

1. reporthttps://stackoverflow.com/questions/25981498/answering-machine-detection-amd-with-twilio-but-after-the-fact · Chris Dutrow · Stack Overflow · 2014-09-22

Machine surfaces

Removal

If you wrote something quoted on this page and want it gone, one email does it. The removal path takes the quote, the handle and the link off this page, out of the feeds and out of the llms.txt within 24 hours, and tombstones the id so the entry cannot quietly return at a new address.