Answering Machine Detection (AMD)

Answering machine detection is technology that tries to tell, in the first seconds of a call, whether a person or a voicemail system answered.

When an outbound call is picked up, the system listens. A person usually says a short "hello" and pauses. A voicemail greeting tends to be longer and continuous, followed by a beep. AMD uses those patterns to guess which one it is.

What teams do with the result:

• Route live answers to a rep or an AI agent.
• Leave a voicemail drop or skip the voicemail and retry later.
• Log the right disposition.

AMD is never perfect. It can mistake a person for a machine, especially if they answer with a long greeting, or wait too long and create dead air. A delay of more than two seconds after the person's greeting before a live representative speaks can count as an abandoned call under federal rules.

Tips:

• Test AMD settings on real calls and listen to recordings.
• Favor shorter detection times to avoid long silences.
• Track how many calls AMD labeled as machines that were really people.

AI voice agents can handle this differently. Some start speaking right away and adjust if they hear a voicemail greeting. Either way, the goal is the same: never leave a real person waiting in silence.

Sources

• 47 CFR 64.1200 (eCFR): https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-64/subpart-L/section-64.1200 (accessed October 17, 2026)

This entry is general information, not legal advice.