# Voicemail False Positives: Tunable vs. Structural Causes

> Diagnose AMD false positives faster. Plura AI helps outbound teams separate tunable errors from structural causes and act on the right fix.

**Published:** 2026-09-05 | **Updated:** 2026-10-03 | **Author:** plurasync
**URL:** https://www.plura.ai/articles/voicemail-detection-false-positives
**Type:** post

**Categories:** AI Contact Centers

![Voicemail False Positives: Tunable vs. Structural Causes](https://plura.sites.aigrowthagent.co/wp-content/uploads/sites/75/2026/09/1788515926749-cd5e15978a33-1024x572.webp)

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## Content

*Written by: Matt Beucler, CEO, Plura AI | Last updated: September 29, 2026*

*Updated 2026-09-29*

## Key Takeaways for High-Volume Outbound Teams

- Voicemail detection false positives occur when AMD systems label live humans as machines, which drops real conversations and wastes budget.
- False positives come from two sources: tunable AMD settings such as timing and noise handling, and structural causes such as iOS 26 Call Screening that configuration changes cannot resolve.
- The four classic tunable causes are monotone speech, tight timing thresholds, background noise corrupting VAD frames, and short human acknowledgments.
- Structural causes such as iOS 26 Call Screening, Google Voice screening, and short T-Mobile voicemail greetings create audio that looks identical to a live human answer.
- Plura AI owns its FCC-licensed carrier stack and enforces detection at origination, which addresses structural false positives at the network layer.

[See how Plura AI supports voicemail detection accuracy](https://www.plura.ai/plura-webchat?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)

## The Four Classic Tunable Causes and Their Parameters

Most operations should rule out tunable causes before blaming carrier or OS screening. Each classic cause maps to specific parameters on common platforms.

### Monotone Speech

A callee who answers with a flat, steady, or prolonged tone can resemble a pre-recorded greeting. [Asterisk AMD measures durations, pauses, word-like segments, and segment counts](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings). A monotone “Hello” produces timing that overlaps with the opening of a voicemail greeting, and the detector has no semantic understanding to separate them.

### Tight Timing Thresholds

Twilio’s documentation notes that a high `MachineDetectionSpeechEndThreshold` delays human detection and can treat human silences as machines.4 The documented default is 1,200 ms. A live person who pauses naturally between words can consume that window before the detector decides.

On Asterisk, [the after_greeting_silence parameter (often 800 ms) defines how much silence must follow a short greeting before the call counts as human](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings). [Shortening this value returns human calls faster but creates false-human results when a voicemail pauses between sentences](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings).

### Background Noise Corrupting VAD Frames

[Different SIP carriers apply noise reduction, echo cancellation, and level normalization in different ways](https://amdify.io/blog/how-ai-voicemail-detection-works-2026). These steps change the signal that AMD analyzes. Static, interference, or office noise corrupts voice activity detection (VAD) frames and shifts silence boundaries.

On Asterisk, [silence_threshold (default 256 in raw PCM units) sets the amplitude below which audio counts as silence](https://amdy.io/blog/vicidial-amd-variables). [A threshold that works on one SIP trunk can fail on another because of background noise, comfort noise, gain, or weak mobile connections](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings).

### Short Human Acknowledgments

[Asterisk’s maximum_number_of_words parameter (default 3) flags an answer as a machine when the greeting exceeds the limit](https://amdy.io/blog/vicidial-amd-variables). [Business receptionists often answer with 6–10 words](https://amdy.io/blog/vicidial-amd-variables). Very short replies such as “Hello?” or “Yeah?” can also be flagged as recordings when word-count logic fires before the detector has enough context.

### Parameter Reference Table

| Platform | Parameter | Default | Effect of Tightening |
| --- | --- | --- | --- |
| Twilio | `machineDetectionSpeechEndThreshold` | 1,200 ms | More false machine detections on human pauses |
| Twilio | `machineDetectionSpeechThreshold` | 2,400 ms | More false machine detections on short human responses |
| Twilio | `machineDetectionSilenceTimeout` | 5,000 ms | More “unknown” results |
| Asterisk | `after_greeting_silence` | 800 ms | Returns human calls faster but creates false-human results on voicemail pauses |
| Asterisk | `maximum_number_of_words` | 3 | More false machine classifications on longer greetings |
| Asterisk | `initial_silence` | [2,500 ms](https://amdy.io/blog/vicidial-amd-variables) | Rejects real people who pause before responding |
| Vapi | `machineDetectionSpeechEndThreshold` | [1,200 ms](https://callsphere.ai/blog/voicemail-detection-accuracy-callsphere-vs-vapi) | Delegates to Twilio AMD; same tradeoffs apply |

For a broader parameter catalog across platforms, see [Voicemail Detection Accuracy: 2026 Benchmarks and Tuning](https://www.plura.ai/articles/voicemail-detection-accuracy-guide/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives).

## The False-Positive and False-Negative Tradeoff

[More aggressive detection reduces missed voicemails but increases live-human hangups](https://vicifast.com/blog/how-to-read-the-amd-log-report). Looser detection protects live answers but sends more machines to agents. Every threshold move shifts both error rates.

Twilio notes that a low `MachineDetectionTimeout` produces more “unknown” results. A low `MachineDetectionSpeechThreshold` produces more false machines on short human responses, and a high `MachineDetectionSpeechEndThreshold` delays human detection and can treat human silences as machines. [On Asterisk, shortening after_greeting_silence returns human calls faster but creates false-human results when a voicemail pauses between sentences](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings).

Track false positives and false negatives separately. A false machine drops a live contact, while a false human wastes agent time on dead air. [To measure AMD false positives, pull 200 random MACHINE recordings and count how many contain a clearly audible human voice](https://amdify.io/blog/how-ai-voicemail-detection-works-2026). A rate above 5% signals meaningful revenue loss. A faster audit is to review MACHINE calls longer than 8 seconds, since [voicemail greetings typically end in 4–7 seconds](https://amdify.io/blog/how-ai-voicemail-detection-works-2026).

[If AMD returns NOTSURE on 10% of calls and the dialplan drops them, the operation is discarding real people with no log](https://amdy.io/blog/vicidial-amd-variables). High NOTSURE rates show that the detector cannot decide, which often means the audio itself is ambiguous.

## Carrier and OS Screening as Structural Causes

Tunable causes share a key property: the audio is classifiable in principle, and parameter changes can shift the decision boundary. Structural causes behave differently. The audio is ambiguous by design, so threshold changes do not resolve the error.

### iOS 26 Call Screening

[Apple’s iOS Call Screening answers calls from unknown numbers, asks for the caller’s name and purpose, and only then rings the user](https://vixi.agency/blog/ai-voice-agent-voicemail-detection). The screener speaks conversationally, pauses for replies, and sounds human by design, so AMD often treats it as a live person.

[When AMD misclassifies the screener as human, the agent delivers the full pitch to the bot](https://vixi.agency/blog/ai-voice-agent-voicemail-detection). The screener captures the script, summarizes it as spam, and ends the call before the phone rings.

Kumar Saurav’s April 2026 arXiv paper [“Real-Time Voicemail Detection in Telephony Audio Using Temporal Speech Activity Features”](https://arxiv.org/abs/2604.09675) reports that phone-side call screeners are “indistinguishable from live humans using temporal features alone.” [The screener’s audio profile matches a live human answer in the first 400 milliseconds](https://amdify.io/blog/how-ai-voicemail-detection-works-2026), so both rule-based AMD and neural VAD face the same structural limit.

### Google Voice Screening

[Google Voice call screening asks callers whose number is not in Contacts to speak their name](https://support.google.com/voice/answer/9262934).4 The recorded name then plays back to the user, while known contacts and businesses bypass the prompt. The prompt is short and conversational with pauses, so timing-based rules often treat it as a human answer.

[Asterisk AMD cannot recognize that “Please state your name and the reason for your call” is a screening prompt](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings). It measures durations and pauses rather than intent.

### T-Mobile Short Voicemail Greetings

Short carrier voicemail greetings create acoustic profiles that differ from longer legacy greetings. These short greetings are a known edge case for detection engines. Twilio notes that a very short two-second voicemail greeting may be interpreted as a human pickup.

The same arXiv paper reports that a short greeting under three seconds was its single false negative on the expert-labeled set. This result confirms that short carrier greetings remain a structural edge case even for well-tuned temporal models.

[Custom business voicemail greetings that begin with a human voice also match live answers in the first 400 milliseconds](https://amdify.io/blog/how-ai-voicemail-detection-works-2026). No parameter moves the decision boundary past that acoustic ambiguity.

## The Diagnostic Test for Tunable vs. Structural Errors

Tunable and structural false positives require different fixes, so the first job is to classify the error. The four-step process below uses call recordings and AMDCAUSE data to separate the two.

1. **Pull the recording.** [Pull the recording of a confirmed AMD false positive and listen](https://vicifast.com/blog/how-to-read-the-amd-log-report). If a real person is cut off mid-greeting, the detector is the issue rather than the data.
2. **Check for a beep.** [If a beep tone in the 1,000–2,000 Hz range occurs within 3–5 seconds after answer, the call was a traditional voicemail and the error is usually tunable](https://dialerbee.com/blog/what-is-answering-machine-detection). If there is no beep and the audio sounds conversational, the call likely involved a screener or short carrier greeting, which points to a structural cause.
3. **Check the AMDCAUSE (Asterisk/VICIdial).**

- [MAXWORDS points toward word segmentation or a low word limit](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings).
- [LONGGREETING indicates that greeting duration exceeded the configured limit](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings).
- [INITIALSILENCE can result from quiet recipients, delayed media, or a short initial-silence limit](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings).
4. **Check the NOTSURE rate.** If NOTSURE appears on a meaningful share of calls and the dialplan drops them, the operation is discarding real people with no disposition. High NOTSURE rates show that the detector cannot decide, which often reflects ambiguous audio.

**Decision Rule:** A false positive with a beep and an AMDCAUSE tied to timing usually responds to parameter tuning. A false positive with no beep and conversational audio usually reflects a structural limit that configuration changes will not fix.

## Rule-Based AMD vs. Neural VAD: Architecture-Level Choice

The table below compares rule-based AMD and neural VAD across detection method, decision window, documented false positive rate, and iOS screening behavior. These attributes determine whether structural false positives remain after tuning.

| Attribute | Rule-Based AMD | Neural VAD |
| --- | --- | --- |
| Detection method | [Fixed timing thresholds](https://amdify.io/blog/how-ai-voicemail-detection-works-2026) | [Temporal speech activity features](https://arxiv.org/abs/2604.09675) |
| Decision window | [1,500–2,500 ms](https://amdify.io/blog/how-ai-voicemail-detection-works-2026) | [200–800 ms](https://amdify.io/blog/how-ai-voicemail-detection-works-2026) |
| False positive rate (documented) | [15–25% (Asterisk defaults)](https://amdify.io/blog/how-ai-voicemail-detection-works-2026) | [0.3% (77,000-call production validation)](https://arxiv.org/abs/2604.09675) |
| Handles iOS screening | No | No (structural limitation) |

**Rule-Based AMD** relies on fixed heuristics such as initial silence, greeting length, word count, and after-greeting silence. [Asterisk’s built-in AMD, used by VICIdial, was designed over a decade ago and analyzes the first few seconds of audio](https://amdify.io/blog/vicidial-amd-false-positive-rate-fix).4 With default parameters, it can drop a significant share of live calls before they reach an agent.3

**Neural VAD** [extracts temporal features from a pre-trained neural voice activity detector and classifies them with a shallow tree-based ensemble](https://arxiv.org/abs/2604.09675). Kumar Saurav’s paper (arXiv:2604.09675) concludes that the evidence separating voicemail from a live answer is not a single acoustic snapshot. It is the sequence of speech and silence over time, a temporal structure that simple threshold rules do not model.

The paper reports [96.1% combined accuracy (734/764) across two evaluation sets](https://arxiv.org/abs/2604.09675): [99.3% (139/140) on an expert-labeled test set](https://arxiv.org/abs/2604.09675) and [95.4% (595/624) on a held-out production set](https://arxiv.org/abs/2604.09675). [In production validation over 77,000 calls, the temporal-feature detector held a 0.3% false positive rate and a 1.3% false negative rate](https://arxiv.org/abs/2604.09675).3

[The same work reports that adding transcription keywords or beep-based features did not improve the best real-time configuration and increased latency](https://arxiv.org/abs/2604.09675). At 8 kHz telephony audio, frequencies above 4 kHz are absent, which limits the value of high-frequency spectral features.

Teams with tunable false positives can often stay on rule-based AMD with careful configuration. Teams facing structural errors need neural VAD or a carrier-level approach.

## When to Stop Tuning and Change Architecture

[Asterisk AMD tuning reaches its practical limit](https://amdy.io/blog/asterisk-amd-configuration-amd-conf-settings) when any of the conditions below appear consistently.

- Reducing false machines consistently increases false humans by an unacceptable amount.
- The same `AMDCAUSE` appears across both correct and incorrect classifications.
- Different trunks require conflicting silence thresholds.
- Call-screening prompts dominate the remaining errors.
- Longer analysis windows drive caller abandonment.
- Campaign-specific overrides have become difficult to operate safely.

At that point, detection architecture becomes the constraint. Plura AI owns its FCC-licensed carrier stack, so voice does not route through Twilio or another CPaaS. That ownership lets Plura issue branded caller ID at the carrier level and run STIR/SHAKEN authentication on every outbound call. The same carrier layer enforces real-time DNC scrubbing, TCPA litigator screening, automated quiet hours, and immutable consent logging on every outbound contact.1,2

Plura’s [AI Predictive Dialer](https://plura.ai/ai-predictive-dialer?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives) selects the next call using stateful conversion signals. Plura’s AI agents communicate with iOS 26’s call-screening layer so calls present with the company’s name and the reason for the call, which converts screened calls into pickups.1 For a deeper market view, see Plura’s guides on [voicemail detection providers](https://www.plura.ai/articles/best-voicemail-detection-providers/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives) and [2026 accuracy benchmarks](https://www.plura.ai/articles/how-accurate-is-voicemail-detection/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives).

[See how Plura’s carrier-owned stack handles screening](https://plura.ai/ai-predictive-dialer?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)

## Frequently Asked Questions

### How Do You Reduce Voicemail Detection False Positives?

First, classify errors as tunable or structural using recordings, beeps, and AMDCAUSE. For tunable issues, adjust timing and word-count parameters on your platform and consider modern neural VAD, which outperforms legacy energy-based VAD in noisy conditions. If errors persist and recordings show screeners or short carrier greetings with no beep, treat the problem as structural and evaluate carrier-level solutions.

### How Do You Measure AMD False Positives Separately from False Negatives?

Sample a set of MACHINE-classified recordings and count how many contain a clearly audible human voice, then track that rate over time. Use call duration filters, such as MACHINE calls longer than typical voicemail greetings, to speed audits. Report human false-positive rate, machine false-negative rate, NOTSURE rate, and median decision time as separate metrics.

### Does iOS Call Screening Cause AMD False Positives?

Yes. iOS Call Screening behaves like a human in the first few hundred milliseconds, so both rule-based AMD and neural VAD treat many screened calls as live answers. [Research on temporal speech activity features](https://arxiv.org/abs/2604.09675) describes these screeners as indistinguishable from humans using timing alone. Operations address this structurally by working at the carrier layer and communicating with the screening feature directly.

### What Is the Difference Between Rule-Based AMD and Neural VAD?

Rule-based AMD uses fixed thresholds on silence, greeting length, and word count, which makes it sensitive to edge cases such as monotone speech and short greetings. Neural VAD uses learned temporal patterns of speech and silence, which improves accuracy and reduces false positives in production tests such as arXiv:2604.09675. Both architectures still face the same structural limits with phone-side screeners.

### When Should You Stop Tuning AMD and Change Detection Architecture?

Stop tuning when every improvement on one error type worsens another, when AMDCAUSE codes no longer explain misclassifications, or when screeners and short greetings dominate residual errors. These patterns show that the remaining gap comes from audio that the current architecture cannot separate reliably.

### How Does Plura AI Handle Voicemail Detection False Positives?

Plura AI addresses voicemail detection at the carrier layer. The platform owns its FCC-licensed carrier stack, issues branded caller ID at the carrier level, and runs STIR/SHAKEN on every outbound call. Plura’s AI agents coordinate with iOS 26’s call-screening layer so calls present with identity and purpose, which improves pickup rates on screened numbers. The same architecture powers the AI Predictive Dialer and enforces real-time DNC scrubbing, TCPA litigator screening, automated quiet hours, and immutable consent logging across outbound traffic. Plura supports compliance but does not replace a customer’s own regulatory obligations.

## Conclusion: From Diagnostic Steps to Architecture Choice

Voicemail detection false positives fall into tunable AMD settings and structural 2026 causes. The diagnostic framework uses recordings, beeps, AMDCAUSE, and NOTSURE rates to separate the two so teams know whether to adjust parameters or revisit architecture.

When tuning hits a ceiling, architecture becomes the lever. Plura AI owns its FCC-licensed carrier stack, issues branded caller ID at the carrier level, runs STIR/SHAKEN on every outbound call, and coordinates with iOS 26’s call-screening layer so calls arrive with clear identity instead of as unknown numbers.1,2

Compare [plans and rates](https://plura.ai/pricing?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives) or run your volumes through [Plura’s ROI calculator](https://plura.ai/calculator?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives) to quantify impact on cost per conversation.

[Review Plura’s AI Predictive Dialer in a live demo](https://plura.ai/ai-predictive-dialer?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)

1 Plura AI maintains SOC 2, HIPAA, ISO, and GDPR posture as part of its platform infrastructure. References to compliance frameworks in this article describe Plura’s platform capabilities and do not constitute a guarantee that any customer using Plura will themselves be compliant with applicable laws or standards. Customers remain solely responsible for their own regulatory obligations, certifications, consent management, recordkeeping, and the claims they make to their own end users. Consult qualified legal counsel for guidance specific to your use case.

2 This article describes regulatory frameworks at a general level and does not constitute legal advice. Laws and regulations vary by jurisdiction, change over time, and apply differently depending on facts and circumstances. Readers should consult qualified legal counsel before making compliance decisions.

3 Performance figures, customer outcomes, and industry statistics referenced in this article are drawn from cited third-party sources or Plura customer case studies. Individual results vary based on implementation, use case, industry, audience, and execution. Past or aggregate performance is not a guarantee of future results.

4 References to third-party products, services, companies, or research are made for informational and comparative purposes only. Plura AI is not affiliated with, endorsed by, or sponsored by any third party named in this article unless explicitly stated. Trademarks and product names referenced remain the property of their respective owners.

This article is provided for informational purposes only and reflects Plura AI’s understanding at the time of publication. Product capabilities, integrations, and specifications are subject to change. For the most current information, visit plura.ai.

This article was produced with the assistance of AI tools and reviewed by Plura AI prior to publication.

## Read Next

- [How To Improve Voicemail Detection Accuracy in AMD](https://www.plura.ai/articles/improve-voicemail-detection-accuracy/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)
- [Voicemail Detection Accuracy: Tuning AMD For Contact Centers](https://www.plura.ai/articles/voicemail-detection-best-practices/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)
- [Voicemail Detection Best Practices: 2026 Tuning Guide](https://www.plura.ai/articles/best-voicemail-detection-practices/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)
- [Voicemail Detection: AMD Accuracy and Carrier Layer](https://www.plura.ai/articles/voicemail-detection-outbound-calls/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)
- [Vonage Voicemail Detection: AMD Accuracy Limits Explained](https://www.plura.ai/articles/vonage-voicemail-detection-accuracy/?utm_source=ai-growth-agent&utm_term=voicemail-detection-false-positives)

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## Citations

- [AI for Contact Center Productivity: The Operator&#8217;s Playbook](https://www.plura.ai/articles/ai-contact-center-productivity-playbook)
- [Reduce Contact Center Costs with AI: A CFO Savings Model](https://www.plura.ai/articles/ai-reduce-contact-center-costs)
- [How To Approach Call Center Labor Reduction In 2026](https://www.plura.ai/articles/call-center-labor-reduction)
- [Call Center Automation Technologies: The 2026 Guide](https://www.plura.ai/articles/call-center-automation-technologies-2026)
- [AI Predictive Dialer ROI: The CFO-Ready Equation](https://www.plura.ai/articles/calculate-ai-predictive-dialer-roi)

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