Correctional facilities use voice biometrics to verify an inmate’s identity on every call, preventing PIN sharing, identity swapping, and unauthorized use of calling privileges. By confirming the inmate is who they claim to be — and can continuously re-check during a call — voice biometrics strengthens security and compliance in inmate telephone systems.
Inmate calling systems are a known security challenge: PINs get shared, inmates use one another’s accounts, and unauthorized calls slip through. Voice biometrics addresses these problems by tying every call to the inmate’s own voice.
The challenge in correctional calling
- Inmates sharing or stealing PINs to use others’ calling accounts
- Identity swapping to bypass call restrictions or monitoring
- Unauthorized parties joining calls (three-way calling)
- The need for reliable records and compliance
How voice biometrics helps
- Verify inmate identity. Confirm the enrolled inmate is the one placing the call — not someone using their PIN.
- Continuous verification. Re-check identity during the call to catch mid-call handoffs.
- Enforce restrictions. Ensure only authorized inmates access particular calling privileges.
- Support compliance. Strengthen the integrity and auditability of the calling system.
Proven, fast, and deepfake-resistant
VoiceVantage works with partners in the corrections and telecom space and provides voice verification that validates in as little as 1.4 milliseconds — fast enough for high call volumes. Its VoiceCheck engine also blocked all five leading deepfake applications in 533 independent University tests, so it resists attempts to fake an inmate’s voice. Explore VoiceVantage products.
Frequently Asked Questions
How does voice biometrics stop PIN sharing in prisons?
Even if a PIN is shared, the call is verified against the enrolled inmate’s voiceprint — so another person cannot pass verification.
Can it detect if someone else joins the call?
Continuous verification can re-check identity during a call to detect mid-call handoffs or unauthorized speakers.
Is it fast enough for busy facilities?
Yes — VoiceVantage validates in as little as 1.4 milliseconds, supporting high call volumes.
Strengthen inmate call security. Contact VoiceVantage about voice biometrics for corrections.