Behind Bars, On Target: How Phonexia's Speech Recognition Powers 100% Call Audits in Prison Call Centers
How do you ensure absolute data privacy, and zero unauthorized communication when your call center operators are prison inmates? You build an automated agent-monitoring pipeline. Here is how Phonexia’s high-precision speech recognition enabled A-GIGA and SentiSquare to secure, analyze, and professionalize inmate call centers — a project that won 1st place at the Czech Contact Center Awards.
The ProjectA joint initiative designed to professionalize contact center operations located within correctional facilities. | The MissionEstablish 100% oversight over customer service calls handled by prison inmates to guarantee absolute security, compliance, and career development. | Phonexia’s RoleProviding a secure, highly precise Speech-to-Text (STT) engine capable of transcribing over 30,000 monthly calls into structured format for immediate AI analysis. |
The Challenge: High-Security Customer Service
For nearly 15 years, A-GIGA has connected the commercial contact center business with profound social responsibility. Operating dedicated call centers within Czech prisons, the company employs inmates to handle active telemarketing and customer support for major brands, including telecommunications giant T-Mobile.
While this model successfully addresses prisoner unemployment and prepares individuals for life after release, operating in a penitentiary environment introduces extreme security challenges:
Zero-Trust Communication: When working with such a specific group, 100% supervision, quality control, and secure communication are essential.
Data Privacy & GDPR: Handling genuine customer data within a high-security facility means data leakage is not an option. Data must be tightly fenced.
The Scale of Monitoring: Manually listening to calls was highly inefficient. Supervisors could only evaluate a tiny fraction (typically single-digit percentages) of the thousands of hours of audio generated monthly. Without an automated, comprehensive system, identifying compliance breaches and protecting client security was an uphill battle.
The Solution: Secure, On-Premises Transcription
To scale their quality assurance, A-GIGA collaborated with SentiSquare to implement AI for Customer Interaction Analysis. However, text analysis is only as good as the transcription that feeds it. SentiSquare required a highly reliable, heavy-duty voice-processing engine.
They turned to Phonexia.
Why Phonexia?
On-Premises & Private Cloud Deployment: For a prison-based project, data privacy is crucial. Phonexia’s Speech Platform is built to deploy entirely within a client’s local infrastructure, or within a private cloud. Highly sensitive customer voice data never leaves the secure, controlled environment.
State-of-the-Art Precision: Utilizing advanced deep neural networks, Phonexia’s Speech to Text technology delivers exceptional accuracy. It easily handles natural, fast-paced colloquial dialogue, background call center noise, and varying audio qualities.
Seamless Integration: Phonexia converts raw, unstructured audio files into clean, timestamped text in JSON format. Using standard, robust REST and gRPC APIs, this structured data flows instantly into SentiSquare's analytical platform for evaluation.
You can test Phonexia Speech to Text technology yourself. Upload a sample audio file or use your microphone to see how accurately it transcribes speech into structured, searchable text in real time.
How It Works: The Automated Audit Pipeline
The automated processing pipeline turns raw voice recordings into business intelligence:
1.Audio Capture
Calls (30,000+ per month) are recorded natively by A-GIGA's telecommunication system. These recordings are securely buffered inside SentiSquare's private cloud.
2.Phonexia Speech Transcription
Phonexia Speech Platform processes the audio. The engine transcribes both speakers (operator vs. customer) and generates high-fidelity text transcripts with millisecond-level timestamps.
3.SentiSquare NLP Evaluation
The text is immediately fed into SentiSquare's highly specialized, task-specific Small Language Models, which scan the conversations for three core metrics:
Communication Quality: Analyzes call structure (introduction, needs identification, offer), emotional tone (positivity, clarity), and compliance with mandatory scripts.
Rules & Security: Scans for prohibited behavior — specifically flagging flirting, suspicious side-comments, and any potential GDPR data privacy violations.
Sales Performance: Evaluates core commercial competencies, tracking the operator's argumentation quality, objection handling, and product presentation.
4.Supervisor Intervention & Coaching
Supervisors use these transcripts in daily one-on-one coaching sessions, offering constructive, objective feedback to the operators.
1. Voice Call
2. Phonexia Speech to Text
3. Structured Transcription
4. SentiSquare NLP
5. Actionable Analytics
Impact & Results
The deployment of Phonexia Speech to Text alongside SentiSquare’s specialized languge models has proven that cutting-edge technology and social responsibility can drive massive commercial success..
Key Metric | Before Implementation | After Phonexia & SentiSquare |
|---|---|---|
Call Audit Coverage | Single-digit % due to random sampling | 100% of all calls monitored |
Acquisition Sales Performance | Baseline | 85% increase in sales |
Tariff Upsell Performance | Baseline | 38% increase in tariff changes |
A Path to Resocialization
Beyond the spreadsheets and sales figures, the most profound impact is human. Armed with precise, objective transcripts of their performance, inmate operators learn how to communicate professionally, take responsibility for their words, and handle high-stress situations.
More than 2,500 individuals have gone through A-GIGA's program, and nearly 100 have transitioned into permanent, post-release employment with the company.
Recognition & Conclusion
The extraordinary synergy between technology and human impact has not gone unnoticed. The joint project, titled "AI for controlling prison operators in a call center," won 1st place in the prestigious "People" category at the Czech Contact Center Award 2025.
"SentiSquare and Phonexia not only give us complete control over agent communications, but also enable the targeted development of their professional skills. These double as essential life skills — such as communication, social interaction, self-presentation, stress management, and accountability — which, combined with our personal mentorship, offer them a real chance at a fresh start after release."
