Why does compression break deepfake detectors?

Many AI detectors look for mathematical high-frequency anomalies that are completely erased when a telephony system compresses the call to 8 kHz sampling, causing them to fail.

How does Sonotheia solve this?

We extract low-frequency physiological and spectral shape parameters (like source excitation phase trajectories) that survive standard codecs.

Is standard VoIP supported?

Telephony VoIP trunks utilizing G.711 or wideband codecs are supported. Web-based meeting applications (Zoom, Teams) are currently out of scope.

Telephony Channel Validation & Codec Survival

Voice fraud occurs over phone lines, not studio-grade microphones. Sonotheia validates acoustic signal survival through lossy telephony channels, specifically calibrating our physics-based sensors for wideband, G.711, and AMR-NB networks.

Opaque neural network models trained on high-fidelity studio datasets often fail when exposed to the aggressive compression of telephony. Sonotheia isolates features robust to codec artifacts.

The threat of telephony codec compression

Codecs like G.711 (u-law/a-law) and AMR-NB compress speech by stripping high frequencies and quantizing waveforms. Opaque machine learning classifiers often rely on fine-grained spectral details that do not survive this compression, resulting in elevated false-rejection rates or silent detection failures.

What we do not claim yet

We do not claim real-time protection on Zoom, Teams, WebRTC, or generic VoIP software networks until Gate A validation criteria are passed. Currently, live defense is validated and scoped exclusively for G.711, AMR-NB, and wideband telephony networks. Real-time claims apply only to evaluated pilot and demo integrations.

Telephony channels and vendor oversight audits

Compliance guidelines mandate that technology limits be disclosed. The FINRA 2026 Annual Regulatory Oversight Report notes that firms must audit vendor limitations under realistic operational scenarios. The NCUA AI resource and the FinCEN deepfake media alert reinforce that controls must map to the actual channel of exposure.

Vendor comparison at a glance

Network Layer	Validated Telephony Channels	Unvalidated VoIP/Software Channels
Codecs Calibrated	Wideband, G.711, AMR-NB	OPUS (WebRTC), SILK, custom software codecs
Live Application	Voice fraud callbacks, wire approvals	Zoom meetings, Microsoft Teams calls
Data Posture	Hashed-only metadata trace	Requires raw stream interception
Verification Status	Gate-A pending (Active Telephony calibration)	Pre-Gate-A exploratory phase

Frequently asked questions

Why does compression break deepfake detectors?: Many AI detectors look for mathematical high-frequency anomalies that are completely erased when a telephony system compresses the call to 8 kHz sampling, causing them to fail.
How does Sonotheia solve this?: We extract low-frequency physiological and spectral shape parameters (like source excitation phase trajectories) that survive standard codecs.
Is standard VoIP supported?: Telephony VoIP trunks utilizing G.711 or wideband codecs are supported. Web-based meeting applications (Zoom, Teams) are currently out of scope.

Official regulatory references

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